Borrowing Capacity Calculator United Kingdom 2026-27
Find out how much a lender would actually approve you for.
Estimate UK mortgage borrowing capacity with income, commitments, dependants, expenditure, deposit, LTV context, and affordability stress-test assumptions.
UK Mortgage Borrowing Notes
UK mortgage affordability usually combines income multiples with expenditure, credit commitments, childcare, dependants, deposit size, LTV, and lender stress testing.
Many UK lenders treat bonus, overtime, self-employed profit, and rental income differently, so the calculator is best used as a planning range rather than a guaranteed offer.
This version uses GBP, LTV, council-tax, student-loan, and affordability-language cues so it reads like a UK mortgage check rather than an Australian borrowing-capacity page.
Use it before comparing Agreement in Principle results, broker policy notes, or lender affordability calculators.
UK-specific treatment for borrowing capacity: figures are framed in pounds, with British household or business wording and the assumptions commonly seen in PAYE, HMRC, mortgage, pension, and consumer-credit contexts.
Watch for UK markers in the page copy and inputs: HMRC, PAYE, National Insurance, pension contributions, stamp duty land tax, miles, APR, part-exchange, council tax, VAT, and GBP-based totals.
The result should be read as a United Kingdom estimate, so compare it with UK provider quotes, HMRC or GOV.UK guidance, lender affordability rules, devolved-nation differences, or regulated advice where needed.
Estimates only — lenders apply their own credit policies. Enter your details below for a personalised figure.
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Your borrowing capacity is the maximum loan a lender may consider serviceable based on your inputs — not a guaranteed approval, and not automatically a safe budget. Lenders estimate your net income after tax, subtract living expenses (using a minimum living-cost benchmark informed by ONS household expenditure data), deduct all debt commitments, then check whether the remaining monthly surplus can cover repayments at a stressed rate: your actual rate plus FCA's 3% buffer.
Use it to check whether your target purchase price is realistic. If the result is within 10–20% of what you need, formal pre-approval with a lender or broker will give you a precise figure based on your actual credit file.
Not a formal approval, not a credit assessment, and not the total amount you need to buy. Deposit, stamp duty land tax, legal fees, and moving costs sit outside this number — typically 4–6% on top of the purchase price.
Each lender uses different living-cost benchmarks, income shading rules, DTI caps, and credit scorecards. Two major banks assessing the same borrower can produce results that differ by £80,000–£150,000. This calculator uses standard FCA methodology as a neutral baseline.
If your result is lower than expected, it's almost always one of four things — not the interest rate. The rate matters far less than most borrowers expect once you account for these committed expenses.
Lenders assume 3% of your total credit limit as a monthly commitment, regardless of what you owe. A £15,000 combined limit adds £450/month to assessed expenses — equivalent to losing roughly £55,000–£65,000 in borrowing power. Closing unused cards before applying is the fastest lever most borrowers have.
Once income exceeds the relevant threshold (Plan 2: £29,385), HMRC deducts Student Loan repayments at 9% of income above the threshold. Lenders treat this as a fixed commitment. On £50,000 income with a Plan 2 loan, the repayment is approximately £1,855/year or £162/month — reducing borrowing capacity by roughly £25,000–£35,000.
These are deducted pound-for-pound from monthly surplus. A £600/month car loan reduces maximum borrowing by £75,000–£90,000. Paying off short-term debt before applying is often more effective than increasing income by the same pound amount.
Living-cost benchmarks rise significantly with dependants. A couple with two children will have a benchmark of approximately £4,200–£4,800/month depending on income bracket, versus £2,900–£3,200 for a childless couple. Even if you declare lower expenses, most lenders assess you on the benchmark if it's higher than what you state, so under-declaring does not improve your assessed capacity.
Deposit size doesn't change your borrowing capacity calculation — but it determines whether the purchase structure actually works. Many borrowers are deposit-bound rather than serviceability-bound. The same loan approval looks completely different at 10% vs 20% deposit.
Borrowing at 80% LTV or below means no Mortgage Indemnity Guarantee. On a £700,000 property, a 20% deposit is £140,000 and you borrow £560,000. No MIG, lower ongoing rate at most lenders, and a stronger negotiating position. Most borrowers target this threshold.
Borrowing above 80% LTV triggers MIG — a one-off premium that protects the lender, not you. On a £700,000 property with a 10% deposit (£70,000), MIG typically adds £10,000–£20,000 to the loan. This increases total cost without increasing your borrowing limit.
Eligible first-time buyers may access Shared Ownership or the mortgage guarantee scheme, allowing purchase with a 5% deposit. Under Shared Ownership you buy a share of the property and pay rent on the remainder. Income caps and property price limits apply. Check gov.uk for current eligibility rules before relying on this pathway.
Income is the most visible driver, but it's the net monthly surplus — what's left after tax, living costs, and existing debt — that determines the ceiling. Two borrowers on identical gross salaries can have borrowing capacities that differ by £100,000 or more.
After tax, National Insurance, benchmark-level living expenses, and the 3% buffer, this range typically supports £380k–£550k depending on debt profile. Even modest Student Loan or a single credit card can shift the result by £50k–£80k. This is the most common first-home-buyer range.
Returns taper as DTI caps (4.5x gross) begin to bind. The jump from £100k to £150k income produces a proportionally smaller improvement than most borrowers expect. At this level, deposit size and card limits typically become the binding constraints rather than raw income.
Adding a second income typically produces a large improvement, but the gain is offset by combined living costs, shared dependants, and combined debt profiles. A couple on £160k combined generally borrows materially more than a single borrower on £80k — but lenders assess both credit profiles fully.
Overtime, bonuses, and commissions are typically shaded to 80% because lenders treat them as less reliable. Rental income is also shaded to 80% (75% at some lenders) to account for vacancy and maintenance. Self-employed borrowers face the most conservative treatment: lenders generally use the lower of the last two years' net taxable income and require two full years of tax returns. Consistent, growing income helps; declining income results in the lower figure being used.
The borrowing formula is national, but what your result means depends entirely on where you want to buy. The same £350,000 approval feels very different in London versus the North East.
In Greater London, median house prices in most established areas exceed £500k–£700k. A £350k result typically requires looking at zones 4–6, shared ownership schemes, or flats in outer boroughs. Stamp Duty Land Tax (SDLT) applies above £250,000 (£425,000 for first-time buyers). First-time buyers pay no SDLT on properties up to £425,000.
The Midlands, North West, and North East offer significantly more housing stock at a given borrowing level. A £350k result accesses family homes in many established suburbs. SDLT rates are the same nationally, but lower property prices mean lower absolute duty. First-time buyers benefit from the same SDLT relief threshold of £425,000.
Scotland uses Land and Buildings Transaction Tax (LBTT) instead of SDLT, with different thresholds. Wales uses Land Transaction Tax (LTT). Northern Ireland uses SDLT. Each has different first-time buyer relief. Property prices are generally lower than England, meaning borrowing capacity stretches further in terms of property quality and size.
If the result is below your target, these are the highest-leverage moves — roughly in order of impact per pound or effort required.
Closing a £10,000 card limit can add £35,000–£50,000 to your borrowing capacity. Do this at least 3 months before applying so the closure reflects in your credit report. If you need a card, reduce the limit to the minimum you actually use — the effect is nearly identical to closing it.
A £400/month car loan reduces maximum borrowing by roughly £50,000–£65,000. Personal loans, BNPL arrangements, and store credit all have similar effects. If you're within 6–12 payments of clearing a debt, finishing it before applying often produces a better result than keeping the cash as a slightly larger deposit.
Even a modest second income of £40,000–£60,000 typically produces a more significant uplift than most single-income improvements. Combined applications are assessed on both incomes, both debts, and combined household costs — but the net effect is almost always positive unless one applicant has significant debt.
Living-cost benchmark floors, income shading rules, and DTI caps vary significantly between major banks, regional banks, and non-bank lenders. A broker can model your profile across multiple lenders simultaneously. The difference between the best and worst policy fit for a specific situation can exceed £100,000 in approved loan amount.
Borrowing capacity answers one question. These are the ones that usually follow, depending on your stage.
Knowing your maximum loan is useful, but you also need to check whether the monthly repayment is comfortable at different rates. A small rate movement on a large loan is a meaningful monthly pound change.
Mortgage repayment calculator →Once you have a target property price, model the full upfront costs: stamp duty land tax, legal fees, building inspection, and conveyancing. These often add 3–5% to the total cash required at settlement on top of the deposit.
If you're still building your deposit, calculate how long it will take at your current savings rate. Adjusting the target property price or adding a savings boost shows a realistic path to entry.
Savings goal calculator →Keeping cash in a linked offset savings account reduces the interest charged on your mortgage without reducing the loan balance itself. The interest savings over 10–20 years can be substantial.
How borrowing capacity is calculated in the United Kingdom
Your borrowing capacity — also called borrowing power, serviceability, or home loan eligibility — is the maximum loan amount a UK lender will approve based on your income, declared expenses, existing debts, and the bank's internal credit policy. The exact figure varies between lenders because each applies different versions of the same methodology, but all FCA-authorised lenders must follow the regulator's minimum serviceability standards.
Step 1: Gross income assessment
Lenders start with your gross income before tax. Not all income types are counted equally. PAYE salary from a permanent role is assessed at 100%. Overtime, bonuses, and commissions are typically shaded to 80% because they're considered less reliable. Rental income is assessed at 80% to account for vacancy and maintenance. Casual and contract income typically requires 12 months of history and may be assessed at 80%. Self-employed income is assessed at the lower of the last two years' net taxable income — if year one was £80k and year two was £100k, many lenders will use £80k.
Step 2: Net income after tax and National Insurance
Lenders convert your gross assessable income to net income by deducting estimated income tax and National Insurance contributions. For a £95,000 gross salary in 2026-27, net income is approximately £65,000 per year or £5,417 per month. Student Loan repayments are also deducted at this stage if you have an active Plan 1, Plan 2, or Plan 5 loan above the relevant threshold.
Step 3: Living costs and lender expenditure checks
UK lenders review declared household expenditure, bank-statement behaviour, dependants, childcare, council tax, utilities, insurance, travel, and food costs. Some lenders use statistical expenditure models as a reasonableness check, but the practical test is whether the full stressed mortgage payment remains affordable after real monthly commitments.
Step 4: Existing debt commitments
All existing monthly debt commitments are subtracted from your income. This includes actual loan repayments (car loans, personal loans, investment property mortgages), 3% of your total credit card limits per month regardless of balance, and BNPL commitments. A credit card with a £15,000 limit creates a £450/month assessed commitment — even if the balance is zero and you pay it off each month.
Step 5: Monthly surplus
The remaining figure after subtracting living expenses and debt commitments from net monthly income is your monthly surplus. This surplus is what you have available to service a new home loan repayment. A borrower on £95,000 gross with £2,500 in declared expenses, no existing debts, and active Student Loan might have a monthly surplus of approximately £2,800–£3,200 depending on exact inputs.
Step 6: FCA/PRA stress test and assessment rate
The FCA and PRA require UK mortgage lenders to test applicants at their actual product rate plus a stress buffer, typically 3%. If a lender quotes a variable rate of 6.20%, all repayments are assessed as if the rate were 9.20%. This is specifically designed to protect borrowers who may experience rate rises after settlement. Some specialist lenders may apply different stress testing approaches, though most use similar buffers.
Step 7: Maximum loan calculation
The maximum loan is the present value of an annuity where the monthly payment equals your surplus, the interest rate is the assessment rate divided by 12, and the term is your chosen loan term in months. At a 9.2% assessment rate over 30 years, a £3,000/month surplus produces a maximum loan of approximately £370,000. At a 9.2% rate over 25 years, the same surplus produces approximately £335,000 — illustrating why loan term is a meaningful lever.
Step 8: Debt-to-income ratio cap
Most major UK lenders now apply a hard DTI cap of 4.5x to 5.5x gross annual income, regardless of what the surplus calculation produces. If your gross income is £120,000, a 4.5x DTI cap limits your maximum loan to £540,000 — even if your surplus analysis suggests you can service more. The FCA and PRA monitor DTI distribution across the industry and can tighten these limits as a macroprudential tool.
UK mortgage affordability examples by household type
These examples are planning guides, not lender quotes. UK lenders combine income multiples with expenditure review, credit commitments, deposit size, LTV band, product rate, stress testing, and credit-file quality. Two applicants with the same salary can receive different results if one has childcare, car finance, student-loan deductions, or a smaller deposit.
Single applicant, PAYE salary
A single PAYE applicant on a steady salary is usually assessed on verified gross pay, payslips, bank statements, existing credit, and regular household spending. Lower incomes are often constrained by living-cost floors; higher incomes can be constrained by loan-to-income policy even when the monthly payment looks affordable.
Joint applicants
Joint applications can improve affordability, but lenders still test childcare, school fees, commuting, credit cards, car finance, maintenance, and the stability of both incomes. If one income is variable, probationary, self-employed, or recently changed, it may be shaded or averaged.
Self-employed borrowers
Self-employed applicants are usually assessed from accounts, SA302s, tax calculations, retained profit, dividends, or salary depending on structure. A strong latest year may not be fully counted if the prior year was materially lower, and some lenders average income rather than taking the best year.
Deposit and LTV examples
| Scenario | What changes the result | Why it matters |
|---|---|---|
| Small deposit | Higher LTV band, fewer products, tighter payment test | The rate and stress test can reduce the loan offered |
| Large deposit | Lower LTV band, wider lender choice, better rates | A lower stressed payment can support a higher loan |
| Credit-card limits | Limits may be assessed even if balances are low | Reducing unused limits can improve affordability |
| Car finance | Monthly repayment is treated as a committed cost | It directly reduces surplus income available for mortgage payments |
| Childcare | Regular childcare is part of expenditure review | It can reduce capacity more than an income multiple suggests |
For a better estimate, model a clean profile, then add commitments one by one: student loan, car finance, credit-card limit, childcare, maintenance, and different deposit sizes. This gives a more realistic UK affordability range than a single salary multiple.
How different income types are assessed — PAYE, self-employed, rental, casual
PAYE permanent employment
Base salary from a permanent role is the most straightforward income type. Counted at 100% of the gross figure shown on payslips. Most lenders require 2–3 recent payslips and a letter of employment confirming the role is permanent. Probationary periods are sometimes an issue — some lenders require you to have completed probation before applying.
Overtime, bonuses, and commissions
Regular overtime and bonuses that have been consistent for at least 12 months are typically accepted at 80%. If you receive irregular bonuses (one-off annual performance bonuses), some lenders accept 80% of the average over two years. Commission income generally requires 2 years of tax returns to demonstrate consistency. Variable income that has declined between years is assessed at the lower figure.
Self-employed income
This is the most variable and often the most constrained income type. Lenders use the lower of the last two financial years' net taxable income from your tax returns. If you earned £85k in year one and £110k in year two, many lenders will use £85k. Some specialist lenders use the average, which can produce a better result. Low-doc loans for self-employed borrowers require at least 12–24 months of UTR registration and may attract higher rates or require larger deposits.
Rental income
Rental income from existing investment properties is assessed at 80% of gross rental income (75% at some lenders). This 20–25% haircut accounts for vacancy, maintenance, property management fees, and council tax. leveraged property investment is taken into account — if your existing investment loan repayment exceeds your rental income, the shortfall is treated as an additional monthly commitment. Use the rental income field in Detailed mode to include this in your calculation.
Casual and contract income
Casual employees typically need 12 months with the same employer to have income considered, assessed at 80%. Some lenders require 12 months at any employer in the same industry. Fixed-term contracts are generally acceptable if there's evidence of contract renewal history. Zero-hours or irregular casual work is the most difficult to have counted — without consistent history it may not be included at all.
Government benefits and Child Benefit
Some government payments are accepted by some lenders. Child Benefit is accepted by many lenders, typically at 100% of the confirmed amount. DWP payments like Universal Credit or Personal Independence Payment (PIP) may be accepted by specialist lenders. Child maintenance payments received may be accepted at 100% with 12 months of demonstrated receipts — child maintenance obligations paid are counted as monthly commitments in full.
Income from multiple employers
Multiple sources of employment income are simply added together, with each source assessed according to its type. A borrower with a £70,000 primary salary and £30,000 from a second zero-hours or agency role might have £70,000 assessed at 100% and £24,000 (80% of £30,000) from the variable income, giving £94,000 in total assessable income.
Side hustle and freelance income
Income from side businesses, freelancing, ride-share driving, delivery work, or any UTR-registered activity is treated as self-employed income. Most lenders require at least 2 full financial years of tax returns showing this income to count it in their assessment. If you have been operating the UTR for less than 2 years, most major banks will not include this income at all. Some specialist lenders will accept 12 months of UTR income with an accountant's letter, but these are typically non-bank lenders. If your primary income is PAYE employment, the side income may still be excluded unless it can be demonstrated as consistent and sustainable.
UTR registered less than 2 years
This is one of the most commonly asked questions for newer self-employed borrowers. If your UTR was registered less than 2 years ago, major lenders typically will not count your business income for serviceability purposes — even if you are earning well. Options include: waiting until you have 2 full years of tax returns; applying through a non-bank or specialist lender who accepts 12 months of UTR income; applying jointly with a PAYE-employed partner whose income alone may support the loan; or seeking a low-doc loan product (which typically requires a 20–40% deposit and carries higher rates).
salary sacrifice and pension contributions
Salary sacrifice (including for vehicles, pension contributions, or cycle-to-work schemes) affects how lenders assess your income. Lenders use your pre-salary-sacrifice gross income for assessment purposes — not your reduced take-home pay. However, the sacrificed amount still reduces your taxable income, which affects the income tax deduction in the serviceability calculation. For employees who sacrifice into workplace pension schemes above the minimum auto-enrolment level, lenders generally consider the pre-sacrifice gross income for assessment — resulting in slightly better capacity than the take-home pay alone would suggest.
Foreign income and overseas employment
Foreign-sourced income (from overseas employers paid in a foreign currency) is typically assessed at 80% of the GBP equivalent after currency conversion, to account for exchange rate risk. Some lenders require additional verification such as a letter from the overseas employer, recent payslips in both foreign currency and GBP, and evidence of regular transfers to a UK bank account. Non-UK residents may face additional LTV restrictions and stricter affordability checks. UK citizens and permanent residents working overseas on UK PAYE arrangements are generally assessed the same as domestic earners.
UK mortgage borrowing by salary
UK lenders do not simply multiply salary by a fixed number. Most start with gross income, then test committed spending, dependants, childcare, credit cards, loans, student-loan deductions, deposit size, credit file quality, and the payment shock if rates rise.
Lower income households
On incomes around £30,000 to £50,000, the limiting factor is often monthly affordability rather than the theoretical income multiple. Rent history, overdrafts, childcare, car finance, and a small deposit can all reduce the loan offered even when the headline salary multiple looks reasonable.
Middle income households
For salaries around £60,000 to £100,000, many applicants see borrowing shaped by LTV band, credit commitments, National Insurance and pension deductions, and whether the application is single or joint. A stronger deposit can move the case into a better rate band and improve the stressed payment test.
Higher earners
Above roughly £100,000, some lenders may consider larger income multiples, but policy varies. Bonus, commission, contractor income, restricted stock, carried interest, or director dividends may be shaded, averaged, or excluded unless there is a clear track record.
Joint applications
Two incomes can materially improve affordability, but lenders still subtract existing debts, childcare, school fees, maintenance, travel costs, and any committed subscriptions or credit agreements. A second income is not always counted at 100% if it is variable, probationary, or recently changed.
What to test next
Run scenarios for a larger deposit, fewer credit commitments, a shorter or longer mortgage term, and different fixed-rate products. In the UK context, the important question is not only "how much could I borrow?" but also whether the payment remains comfortable after council tax, utilities, insurance, travel, and savings.
What reduces borrowing capacity — Student Loan, credit cards, loans, dependants
Student Loan debt and home loan borrowing power
Student Loan debt is one of the most commonly overlooked factors affecting borrowing capacity. HMRC begins collecting repayments once your income exceeds the relevant threshold (Plan 2: £29,385 in 2026-27). The repayment rate is 9% of income above the threshold. These repayments are deducted directly from your wages through the PAYE system and cannot be avoided.
Lenders treat Student Loan repayments as a fixed monthly commitment and subtract them from your usable income. On a £95,000 salary with an active Plan 2 Student Loan, the annual repayment is 9% of income above £29,385 — approximately £6,090, or about £508/month. This reduces the monthly surplus available for mortgage repayments, decreasing maximum borrowing capacity by approximately £55,000–£70,000 at standard assessment rates.
If you have a small remaining Student Loan balance (under £15,000–£20,000) and the financial capacity to pay it out, this is worth modelling. Paying out £15,000 in Student Loan could increase your borrowing capacity by £40,000–£60,000 — a significant return on the paydown. Use the Student Loan field in Detailed mode to compare scenarios with and without the debt.
Credit cards and borrowing power
Credit card limits have an outsized effect on borrowing capacity relative to their apparent cost. Lenders assume 3% of your total credit card limit as a monthly commitment — not 3% of the balance. This reflects the risk that you could max out the card at any time.
Impact examples: a £10,000 credit limit reduces borrowing capacity by approximately £35,000–£45,000. A £20,000 combined limit reduces capacity by approximately £70,000–£90,000. A £30,000 combined limit (common for people with two or three cards) reduces capacity by approximately £105,000–£135,000. These figures assume a 9.2% assessment rate over 30 years.
Actions to take: close cards you don't use, reduce limits on cards you keep, and do this at least 3 months before applying for pre-approval. The closure needs time to reflect in your credit file.
Car loans and personal loans
Monthly repayments on car loans, personal loans, and hire purchase arrangements are subtracted pound-for-pound from your monthly surplus. A £600/month car loan payment effectively removes £600 from the income available to service a home loan — reducing borrowing capacity by approximately £75,000–£90,000 at standard assessment rates.
If you have a car loan with 12 months remaining and manageable outstanding balance, paying it out before applying is often worthwhile. The increase in borrowing capacity typically exceeds the interest saved by clearing the loan early. Use the existing loans field in Standard mode to model this comparison.
BNPL — Klarna, Clearpay, and other services
Buy Now Pay Later services are increasingly captured in lender serviceability assessments. BNPL balances may appear in your credit file from comprehensive credit reporting, and regular BNPL payments in bank statements are treated as recurring commitments. Even small BNPL arrangements that seem inconsequential can show up as multiple credit enquiries and add to your total assessed monthly commitments. Clearing and closing BNPL accounts before applying is a prudent step.
Dependants and household size
Each dependant increases the assessed household spending benchmark used to assess your minimum living expenses. A single person on £80,000 might have a living-cost benchmark of approximately £2,100/month. A couple with two children on the same income might have a benchmark of approximately £4,000–£4,500/month — more than double. The benchmark rises with both the number of dependants and your income level.
Two dependent children can reduce borrowing capacity by £80,000–£130,000 compared to an otherwise identical couple with no children. This is not a reason to delay family formation, but it is important context for timing property purchases relative to family plans.
How to increase your borrowing capacity before applying
6–12 months before applying
Cancel unused credit cards. Every £10,000 in card limits removed can add £35,000–£50,000 to borrowing capacity. If you need a card, reduce the limit to the minimum required. Allow 3 months for changes to appear in your credit file.
Pay off short-term debt. Car loans, personal loans, and BNPL are deducted from surplus pound-for-pound. Prioritise clearing debts that are close to paid off. A £15,000 remaining car loan at £500/month could be worth paying out if it increases your borrowing capacity by £65,000.
Consolidate or close BNPL accounts. Multiple BNPL services leave multiple enquiries on your credit file. Close what you're not actively using.
3–6 months before applying
Build a clean transaction history. Lenders examine 3–6 months of bank statements for gambling transactions, unexplained large transfers, consistent overdrafts, and irregular spending. Regular savings demonstrated over this period also strengthens your application.
Run a pre-assessment with a broker. A mortgage broker can model your profile across multiple lenders simultaneously. Given that the difference between lenders can be £80,000–£150,000 for the same borrower, this is worth doing before committing to a specific bank.
Structural moves that improve the result
Add a joint applicant. Even a modest second income of £40,000–£60,000 typically produces a substantial uplift. Combined applications are assessed on both incomes and both debts — but the net effect is almost always positive unless one applicant has very high existing debt.
Extend the loan term to 30 years. A longer term reduces the monthly repayment at the assessment rate, increasing the principal you can borrow. The trade-off is more total interest — but extra repayments can always reduce this after settlement. Choosing a 30-year term doesn't commit you to 30 years of standard repayments.
Consider specialist lenders. Specialist lenders may apply different affordability assessment policies. For specific borrower profiles — particularly self-employed applicants, investors, or those with recent employment changes — specialist lenders can sometimes offer meaningfully higher approved amounts.
Model different lender floor rates. Some lenders apply minimum assessment floor rates (commonly 5.5%–6.0%) regardless of the actual product rate. In a falling-rate environment, a lender without a restrictive floor rate can produce a better serviceability result. Use Advanced mode to model different floor rate scenarios.
Income improvements that help
Increasing income is the most direct path to higher borrowing capacity, but it also takes the most time to achieve and demonstrate. A pay rise needs to be reflected in at least one payslip to be counted. A new higher-paying job may require 3 months of payslips to verify permanency. Self-employed income needs 2 full financial years of higher earnings to fully benefit the assessment.
For borrowers timing an income increase with a property purchase, getting formal pre-approval at current income and then updating with the new income once confirmed is a common approach. Most pre-approvals are valid for 90 days and can often be extended or reassessed.
LTV bands and how they affect your rate
Your Loan-to-Value Ratio (LTV) — the loan amount as a percentage of the property value — affects both what you can borrow and the interest rate you'll pay. Most lenders price loans in LTV bands: below 60%, 60–70%, 70–80%, 80–90%, and above 90%. Borrowers at 80% LTV or below avoid MIG entirely. Moving from 85% LTV to 80% LTV typically saves 0.1–0.3% on the interest rate (a "rate discount") in addition to eliminating the MIG premium. On a £700,000 loan over 30 years, a 0.2% rate saving amounts to approximately £30,000–£40,000 in total interest. Saving an extra £35,000 in deposit to cross the 80% LTV threshold often provides a strong financial return.
Offset mortgage vs overpayments — which builds more capacity?
For borrowers who already have a mortgage and are looking to maximise equity for a future purchase, an offset mortgage and regular overpayments both reduce the effective interest paid. An offset mortgage links your savings to the loan, keeping the cash accessible while reducing the interest charged on the balance each day. Overpaying instead reduces the outstanding balance directly (and therefore shows a lower balance to a lender assessing you for a second mortgage). For borrowers planning to use equity to fund a future buy-to-let purchase, reducing the main-residence balance through overpayments is generally better for affordability — the lower balance means a smaller monthly repayment commitment, improving the surplus available to service the new loan.
Refinancing to increase borrowing capacity
Refinancing an existing mortgage at a lower rate, or extending the remaining term, can free up monthly cash flow and improve your serviceability for a new purchase. If you refinance a 20-year remaining term back to 30 years, the monthly repayment falls significantly — this reduced commitment appears in your serviceability assessment as a lower existing debt burden. The trade-off is more total interest over the life of the extended loan. Used strategically before an investment property purchase, refinancing-to-extend can meaningfully increase your assessed maximum borrowing for the new loan.
FCA serviceability rules, DTI caps, and what banks actually test
The FCA/PRA stress test
The FCA and PRA require UK mortgage lenders to stress-test borrowers at the higher of: their actual loan rate plus 3%, or a minimum floor rate of 5.5% (though many lenders now use higher floors). This stress test ensures borrowers can afford repayments if interest rates rise. The PRA has the authority to adjust these requirements and monitors affordability standards across the industry as a macroprudential tool.
Debt-to-income monitoring
The FCA and PRA monitor the proportion of new lending at high DTI ratios (above 4.5x gross income) across the industry as a macroprudential measure. Individual banks set their own DTI limits — most major lenders use 4.5x to 5.5x — but regulators can impose industry-wide limits if they determine the share of high-DTI lending poses systemic risk. In practice, this means borrowers near or above 4.5x gross income will find fewer lenders willing to approve their loan and may face higher rates or stricter conditions.
What lenders actually test beyond the buffer
The FCA buffer is the minimum standard, but individual lenders layer additional tests on top. These include: living-cost benchmark multipliers (lenders apply their own household expenditure benchmarks informed by ONS data), income shading (some lenders shade primary income for certain employment types), minimum living expense floors regardless of declared expenses, maximum loan-to-income ratios, and internal credit score overlays that may restrict amounts even when serviceability is technically met. This is why two lenders can show materially different results for identical inputs.
Responsible lending obligations
Lenders have obligations under FCA rules (MCOB — Mortgages and Home Finance: Conduct of Business sourcebook) to assess whether a loan is affordable for the borrower. This includes assessing whether the borrower can repay without substantial hardship. Following the Mortgage Market Review (MMR), lenders substantially increased the scrutiny applied to declared expenses — bank statements are now typically examined for 3–6 months, and undeclared subscriptions, regular transfers, and discretionary spending patterns are commonly identified and factored in.
First home buyer borrowing capacity — grants, guarantees, and deposit schemes
Shared Ownership
Shared Ownership allows eligible first-time buyers to purchase a share (25%–75%) of a property and pay rent on the remainder. This reduces the deposit needed and the mortgage amount required. You can staircase (buy additional shares) over time. Income caps apply — typically £80,000 in England (£90,000 in London). Shared Ownership does not increase your borrowing capacity for the share you purchase — you still need to demonstrate you can service the mortgage plus rent at the assessment rate.
Lifetime ISA (LISA)
The Lifetime ISA allows first-time buyers aged 18–39 to save up to £4,000 per year, with the government adding a 25% bonus (up to £1,000 per year). The property must cost £450,000 or less. The LISA does not directly increase your borrowing capacity but does contribute to your total deposit through the government bonus, potentially helping you reach the minimum required deposit threshold without borrowing more.
First-time buyer SDLT relief
First-time buyers in England and Northern Ireland pay no Stamp Duty Land Tax (SDLT) on the first £425,000 of a property priced up to £625,000, with a reduced rate of 5% on the portion between £425,001 and £625,000. Scotland and Wales have their own first-time buyer reliefs under LBTT and LTT respectively. These reliefs significantly reduce the upfront cash requirement, effectively allowing a larger proportion of savings to go toward the deposit rather than transaction costs.
First home buyer borrowing capacity considerations
First home buyers often have the most constrained borrowing capacity profiles due to: lower income levels early in careers, active Student Loan debts from university, limited deposit requiring a higher LTV, and shorter employment history making some income types harder to verify. The combination of Student Loan debt and a credit card limit (even partially used) can reduce borrowing capacity by £100,000–£150,000 compared to an otherwise equivalent profile without these commitments. Addressing these before applying is the most effective preparation strategy.
Lifetime ISA — detailed rules
The Lifetime ISA can be opened by anyone aged 18–39, and you can continue contributing until age 50. The government adds a 25% bonus on contributions up to £4,000 per year (maximum £1,000 bonus annually). To use the LISA for a home purchase, the property must cost £450,000 or less, you must be a first-time buyer, and you must have had the account open for at least 12 months. If you withdraw for any purpose other than a first home or retirement after age 60, a 25% penalty applies (effectively losing the bonus plus some of your own money). LISA contributions do not increase your borrowing capacity directly — they accelerate deposit accumulation through the government bonus.
Using crypto or non-standard assets as a deposit
Most lenders do not accept cryptocurrency directly as evidence of savings. If you hold crypto assets you intend to liquidate for a deposit, you will need to convert to GBP and hold in a bank account for at least 3 months before applying, so that it appears as genuine savings in your bank statements. Lenders look for a consistent savings history — a large unexplained deposit from a single transfer (even from crypto sale proceeds) may trigger additional scrutiny and requests for evidence of the source of funds.
Investment property borrowing capacity — rental income, leveraged property investment, and cross-collateralisation
How rental income affects borrowing capacity
Rental income from existing investment properties is assessed at 80% of gross rent (75% at some lenders). If you receive £26,000/year in rental income, lenders will count approximately £20,800–£21,840 toward your assessable income. The 20–25% haircut accounts for vacancy periods, property management fees, maintenance costs, council tax, and insurance. The rental income field in Detailed mode uses 80% shading by default, which can be adjusted in Advanced mode.
leveraged property investment and borrowing capacity
If your investment property is negatively geared — meaning the rental income is less than the loan repayments and running costs — the shortfall is treated as an additional monthly commitment that reduces your overall borrowing capacity for a new purchase. A property generating £1,800/month in rent with £2,400/month in repayments creates a £600/month assessed shortfall. This effectively reduces your maximum loan on a new purchase by approximately £75,000–£90,000 at standard assessment rates.
Cross-collateralisation and existing mortgages
If you own investment properties with existing mortgages, those loan repayments are counted as monthly commitments in full, regardless of rental income. The existing loans field in Standard mode allows you to enter the combined monthly repayments across all existing investment loans. On a £600,000 investment loan at 6.5%, the monthly repayment is approximately £3,800 — this reduces your maximum new-purchase borrowing by roughly £470,000 at 9.2% assessment rate. Portfolio lenders sometimes apply alternative assessment methods, which is another reason to compare across multiple institutions through a broker.
Investors and DTI caps
Property investors accumulating multiple mortgages are particularly affected by DTI caps. Total debt (including all investment loans) divided by gross income is assessed against the lender's DTI limit. An investor with £1.5m in existing investment mortgages and £150,000 gross income is already at 10x DTI — well above most lenders' 4.5–5.5x limits. This is why investors often need specialist lenders, higher income, or to demonstrate strong positive cash flow across the portfolio to continue acquiring properties.
main residence vs investment property — how lenders treat the difference
Your principal place of residence (main residence) and investment properties are assessed differently by lenders. main residence loans typically attract lower rates and more favourable LTV treatment (up to 95% with MIG). Investment property loans typically have a maximum LTV of 80–90% with MIG, and interest rates are usually 0.2–0.6% higher than equivalent main residence loans. If you are purchasing an investment property while renting (no main residence mortgage), your rental payments are not treated as a housing expense for serviceability — but some lenders may apply a notional rent expense to account for the risk that you might purchase a main residence in future and be servicing both simultaneously.
Negative equity and borrowing again
Negative equity occurs when your outstanding loan balance exceeds the current market value of your property. In a declining market, this can prevent refinancing (lenders won't take on a loan that exceeds the security value) and can affect your ability to borrow for a second property. If your existing property has declined in value and your LTV has risen above 80%, you may need to demonstrate equity elsewhere or wait for values to recover before accessing further credit. This is a key reason why buying at a high LTV in a volatile market carries additional risk beyond the standard repayment burden.
How borrowing capacity differs between major banks and specialist lenders
Why the same borrower gets different amounts from different lenders
UK lenders all follow FCA's minimum standards but apply their own overlays. The key sources of variation are: (1) living-cost benchmarks — lenders apply different household expenditure benchmarks, raising or lowering the assessed expense floor; (2) income shading rates — some lenders shade bonuses to 60% rather than 80%; (3) DTI caps — some use 4.5x, others 5x or 5.5x; (4) assessment floor rates — some apply a minimum 5.5% assessment rate even if product rates are lower; (5) credit score overlays — internal risk models may restrict approved amounts even when serviceability is met.
Major high street bank approach
The major high street banks — NatWest, Barclays, HSBC, Lloyds, and Nationwide — typically apply the most conservative affordability benchmarks and income shading policies, reflecting their compliance obligations and risk appetite. They also have the most sophisticated credit scoring systems, which can work in favour of borrowers with very strong profiles but against those with any irregularities. These banks are PRA-supervised and FCA-regulated, and must comply with all macroprudential requirements.
Smaller banks and credit unions
Smaller lenders — building societies, credit unions, and mutual societies — often use more flexible affordability benchmarks and may have less stringent income shading policies for specific income types (particularly self-employed). Some building societies have stronger relationships with specific industries or employment types, which can produce better outcomes for borrowers in those categories. They are still FCA-regulated and must comply with responsible lending requirements.
Specialist lenders
Specialist lenders — including Kensington Mortgages, Precise Mortgages, Aldermore, Together Money, and Pepper Money UK — cater to borrowers who may not meet high street criteria. They may apply more flexible affordability assessments for specific borrower profiles. Specialist lenders are typically best suited to borrowers who face specific constraints with traditional lenders — self-employed with complex financials, recently started businesses, adverse credit history, or unusual income structures. Rates are usually 0.3–1.0% higher than major bank rates to reflect the additional risk.
The value of mortgage broker comparison
A mortgage broker with access to multiple lenders can model your profile against the full market simultaneously. Given that the difference between the best and worst policy fit for a specific borrower can be £80,000–£150,000 in approved amount — and potentially 0.5–1.0% in interest rate — this comparison has significant financial value. Brokers are paid by lenders (via trail commission) rather than the borrower in most cases, though this structure means it's worth confirming you're being shown options from the full panel rather than a preferred subset.
Online lenders and digital mortgage platforms
Digital-first lenders including Habito, Trussle, Mojo Mortgages, and Atom Bank offer highly streamlined application experiences and often competitive rates — particularly for borrowers with clean, straightforward profiles. Their borrowing capacity assessments typically use standard FCA methodology, so the approved amount is similar to a traditional lender for the same inputs. The primary advantage is speed and cost — lower overheads allow sharper pricing. For complex situations (self-employed, multiple income sources, adverse credit) traditional lenders or specialist lenders generally offer more flexible assessment policies than fully automated online platforms.
Home loan pre-approval — what it is, how to get it, and how long it lasts
What is pre-approval?
Pre-approval (also called conditional approval or approval in principle) is a lender's written confirmation that they would be prepared to lend you up to a specified amount, subject to final verification. It confirms your borrowing capacity has been assessed against your income, expenses, and debts, and gives you a realistic budget for property searching. Pre-approval is not a guarantee of final approval — the lender still needs to assess the specific property you buy (via valuation) and reconfirm your financial position at the time of purchase.
How to get pre-approval
Most lenders offer pre-approval online, through a branch, or via a mortgage broker. You'll need to provide: recent payslips (2–3), your last two tax returns if self-employed, bank statements (3–6 months), evidence of savings for deposit, identification documents, and details of existing debts and credit cards. The lender will run a credit check as part of the assessment, which appears on your credit file. Multiple credit enquiries within a short period can slightly reduce your credit score, so avoid applying to many lenders simultaneously — use a broker to compare without multiple enquiries.
How long does pre-approval last?
Most pre-approvals are valid for 90 days. After 90 days, you typically need to request an extension or reapply. Your financial position is reassessed at renewal, so changes to income, new debts, or interest rate movements can affect the renewed amount. If you haven't found a property within 90 days, renewing early — before expiry — is generally smoother than lapsing and restarting. Some lenders offer 6-month pre-approvals for borrowers with complex situations.
Pre-approval vs formal approval
Pre-approval lets you bid at auction or make an offer with confidence. Formal (unconditional) approval is issued once the lender has assessed the specific property, received a satisfactory valuation, and completed final credit checks. Settlement typically occurs 30–90 days after exchange. At this stage, your financial position must still match what was assessed at pre-approval — major changes (job loss, new car loan, large credit card balance) between pre-approval and settlement can jeopardise formal approval.
Using this calculator for pre-approval preparation
The figure from this calculator gives you a strong indication of your pre-approval range. To maximise your formal pre-approval amount: close unused credit cards 3 months before applying, pay down short-term debts, maintain consistent savings, and avoid taking on new financial commitments. Run the Advanced mode on this calculator to model different lender buffer rates — some non-bank lenders assess at lower effective rates, producing higher pre-approval limits for the same income.
Fixed vs variable rate — how your rate type affects borrowing capacity
Does a fixed rate increase borrowing capacity?
In general, no — and in some cases a fixed rate can reduce your assessed capacity. FCA requires lenders to assess your ability to repay at the higher of: your actual product rate plus 3%, or a minimum floor rate (typically 5.5–6.0%). Because fixed rates are often quoted similarly to or slightly below variable rates, the assessment rate used is essentially the same. What changes is certainty, not capacity.
The 2-year rule for fixed rate assessment
Some lenders use the revert variable rate (the rate your loan switches to after the fixed period ends) as the base for assessment rather than the current fixed rate. If your 2-year fixed rate is 5.8% but the revert variable is 6.5%, the lender may assess you at 6.5% + 3% buffer = 9.5% — which reduces borrowing capacity compared to being assessed at 5.8% + 3% = 8.8%. This varies by lender, so it's worth confirming the assessment methodology before choosing a fixed rate product specifically for borrowing capacity reasons.
Split loans — part fixed, part variable
A split loan divides your borrowing into a fixed component (rate certainty on part of the loan) and a variable component (flexibility for extra repayments on the remainder). Most lenders assess split loans using a blended effective rate across both portions. The borrowing capacity impact is usually minimal versus a fully variable loan at the same overall rate.
Rate movements and future capacity
If The Bank of England cuts rates, variable rate borrowers benefit immediately — and FCA's buffer means assessed capacity rises even faster. A 1% rate cut (e.g., from 6.2% to 5.2%) changes the assessment rate from 9.2% to 8.2%, which typically increases borrowing capacity by £40,000–£70,000 on a £100,000 income. Fixed rate borrowers don't see this benefit during their fixed period. When comparing loan products, use the Advanced mode on this calculator to model the impact of different assessment rates on your maximum loan.
Guarantor home loans United Kingdom — how they work and who qualifies
What is a guarantor home loan?
A guarantor home loan allows a parent or immediate family member (the guarantor) to use equity in their own property as additional security for your loan. This allows you to borrow up to 100% of the purchase price (or even include stamp duty land tax and costs) without a traditional deposit, and typically without paying Mortgage Indemnity Guarantee. The guarantor doesn't provide cash — they put their property up as security, meaning the lender can call on that property if you default and your property's value doesn't cover the debt.
How guarantor loans affect borrowing capacity
The guarantor arrangement addresses the deposit constraint rather than the serviceability constraint. Your maximum loan is still determined by your income, expenses, and debt — the borrowing capacity calculation shown in this calculator still applies. What changes is the deposit requirement: instead of needing a 10–20% deposit, your guarantor's equity substitutes for some or all of it. You still need to demonstrate you can service the full repayment yourself.
Limited vs unlimited guarantee
A limited (or family) guarantee restricts the guarantor's exposure to a specific pound amount — typically the amount required to bring the loan-to-value ratio to 80% (removing MIG). Once the loan balance falls below 80% LTV through repayments or property price growth, the guarantee can be released. An unlimited guarantee exposes the guarantor to the full loan amount and is now uncommon. Always insist on a limited guarantee and seek independent legal advice before proceeding.
Who qualifies as a guarantor?
Most lenders accept parents or step-parents as guarantors. Some accept siblings or grandparents. The guarantor must own property in the United Kingdom with sufficient equity (typically at least 20% of its value free of debt) and must meet the lender's own borrower criteria — they typically cannot have adverse credit history. The guarantor should seek independent financial and legal advice before signing, as their property is at genuine risk if you cannot meet repayments.
Borrowing on part-time income, parental leave, or returning to work
Part-time income and home loans
Part-time PAYE income is assessed at 100% of the documented rate, provided you have been in the role for at least 3–6 months (most lenders) or 12 months (more conservative lenders). The critical factor is demonstrating the role is permanent part-time, not casual. A permanent part-time employee earning £55,000/year is assessed the same way as a full-time employee on the same income. The borrowing capacity result will be proportionally lower — but the methodology is identical. Use this calculator with your actual part-time income figure for an accurate estimate.
Parental leave — on leave at the time of applying
This is one of the most nuanced income situations. If you are currently on maternity, paternity, adoption, or shared parental leave — whether you are receiving enhanced employer pay or the statutory minimum — lenders typically assess your borrowing capacity at your return-to-work salary, not your current reduced leave pay. You'll need a letter from your employer confirming: your pre-leave salary, your scheduled return-to-work date, and that your role is being held for you. Some lenders require you to have already returned to work before approving. If both applicants are on leave simultaneously, most lenders will not proceed until at least one has returned.
Returning to work after parental leave
Once you have returned to work, lenders typically require 3 months of payslips at your return-to-work salary before assessing it at 100%. During the 3-month period, some lenders will accept a lower shading (80%) with a letter of employment. If you are returning to work part-time, your income will be assessed at the actual part-time rate — which may differ from your full-time pre-leave salary. Plan applications after you have 2–3 months of payslips at your current rate if possible.
Statutory Maternity, Paternity and Shared Parental Pay
Statutory Maternity Pay (SMP) is paid by your employer — who reclaims most of it from HMRC — at 90% of your average weekly earnings for the first 6 weeks, then the lower of £194.32 per week or 90% of average weekly earnings for up to a further 33 weeks (2026/27 rate). Statutory Paternity Pay and Shared Parental Pay are paid at the same £194.32 weekly cap. If you don't qualify for SMP — for example some self-employed parents — you may instead claim Maternity Allowance from the DWP. Because this statutory pay is temporary and well below most salaries, lenders generally do not treat it as ongoing assessable income; they assess your return-to-work salary instead. Enhanced (contractual) employer maternity or paternity pay that continues your normal salary is treated differently — it can be counted as ongoing income where there is documented evidence of your return-to-work date and confirmed employment continuity.
Borrowing capacity for part-time workers — examples
A permanent part-time nurse working 3 days/week on a pro-rata £52,000 salary with no debts would typically qualify for approximately £195,000–£250,000. A teacher working 4 days/week on £66,000 with no debts would typically qualify for approximately £265,000–£335,000. These can be materially improved with a joint application — a part-time worker paired with a full-time partner typically sees a combined borrowing capacity much stronger than either alone.
Rent vs buy in United Kingdom 2026-27 — when buying makes financial sense
The core financial trade-off
The rent vs buy decision in the United Kingdom is primarily a comparison of two costs: the ongoing cost of renting (rent + opportunity cost of the deposit not invested) versus the ongoing cost of owning (mortgage repayments + rates + maintenance + insurance − any capital growth). In most UK city markets, buying is more expensive in the short term but typically superior over a 7–10 year+ horizon, assuming typical historical capital growth rates of 5–7% per annum.
The break-even rule of thumb
A commonly used guideline: if your weekly rent is less than 0.5% of the purchase price per year (i.e., annual rent is less than 2.5% of purchase price), you may be better off renting and investing the equivalent deposit. If your rent is more than 2.5–3% of the purchase price annually, buying likely makes financial sense if you can service the loan. Example: a £700,000 property — if annual rent is under £17,500 (£337/week), renting may be advantageous. If you're paying £500/week (£26,000/year = 3.7% of purchase price), buying is likely the better long-term financial decision.
Non-financial reasons to buy
Security of tenure (landlords can terminate leases), the ability to renovate and personalise, stability for children's schooling, and the psychological benefit of owning your home are significant factors that don't appear in financial comparisons. Many Britons place high value on these benefits regardless of the financial calculus.
What this calculator tells you about the rent vs buy decision
Your borrowing capacity sets the price range you can access. If your maximum loan is £550,000 and you have a £100,000 deposit, your target purchase price is up to £650,000. The monthly repayment at your actual rate (shown in the results above) is your direct comparison to your current monthly rent. If the mortgage repayment is within 20–30% of your current rent, the financial case for buying is typically strong — you are building equity rather than paying a landlord, and the repayment is largely fixed while rents tend to rise with inflation over time.
Construction loans, apartment borrowing, and specific home loan types
Construction loan borrowing capacity
Construction loans are assessed differently from standard home loans. The lender approves the total cost (land + build), but funds are drawn progressively as construction stages are completed. During construction, you typically make interest-only repayments on the drawn-down amount, transitioning to principal and interest once construction is complete. For serviceability purposes, most lenders assess the full end-debt at principal and interest from the outset (not the interest-only construction phase), which produces a similar borrowing capacity to a standard loan. Some lenders apply additional risk overlays for construction, particularly for owner-builder projects.
Can I borrow more for a new build?
In some cases, yes. Various government schemes support new builds, including Help to Build equity loans for custom and self-build projects. Some local authorities offer additional incentives for new construction. These don't directly increase your borrowing capacity but reduce your required cash outlay, allowing a larger portion of savings to go toward the deposit rather than transaction costs.
Apartment and unit borrowing — does it differ?
Borrowing capacity is the same regardless of property type — it's determined by your income and expenses, not what you're buying. However, lenders apply Loan-to-Value Ratio restrictions that effectively constrain apartments more than houses. High-density apartments (buildings over 40 storeys, or studio/1-bedroom apartments under 50sqm in major cities) may be subject to maximum LTV of 70–80% rather than 90–95%, meaning you need a larger deposit for the same purchase price. Serviced apartments and student accommodation are typically assessed at maximum 60–70% LTV and may not be eligible for standard residential lending at all.
Bridging loans
A bridging loan allows you to purchase a new property before selling your existing one. The lender assesses whether you can service both loans simultaneously (peak debt scenario) or whether the sale proceeds will reduce the debt within the agreed bridging period (typically 6–12 months). Bridging loans are assessed on serviceability of the peak debt, which significantly reduces how much you can borrow during the bridging period. They are best used for short gaps between purchase and sale, not as a medium-term financing strategy.
Frequently asked Frequently asked questions
How accurate is this borrowing capacity calculator?
This calculator uses standard FCA-compliant serviceability methodology and produces reliable planning estimates. Actual bank approvals vary by ±10–20% because each lender applies their own living-cost benchmarks, income shading rules, credit-score overlays, and DTI caps. Use this number to stress-test your price range, understand the key drivers, and identify what to work on before applying. Then get formal pre-approval for a precise figure based on your actual credit file and the lender's specific policy.
How much can I borrow on a £100k salary in the United Kingdom?
On a £100,000 gross salary with no debts, no Student Loan, and no dependants, the typical borrowing capacity range is £500,000–£600,000. This assumes declared expenses near the living-cost benchmark (£2,200–£2,400/month), a 6.2% interest rate, a 3% FCA buffer, and a 30-year loan term. Adding a £40,000 Student Loan debt reduces this by approximately £55,000–£70,000. Adding a £15,000 credit card limit reduces this by approximately £55,000–£65,000. Enter your actual details in the calculator above for a personalised figure.
Does Mortgage Indemnity Guarantee (MIG) increase my borrowing capacity?
No — MIG allows you to borrow above 80% LTV without a 20% deposit, but it doesn't change the maximum loan amount a lender will approve on serviceability grounds. You still need to demonstrate you can afford repayments at the assessed rate. MIG increases your upfront cost and total loan balance; it doesn't increase your approved borrowing limit. The main benefit of MIG is enabling you to buy sooner without a full 20% deposit rather than waiting to save more.
How does Student Loan debt affect borrowing capacity?
Student Loan repayments are treated as a fixed monthly commitment and subtracted from your usable income. For Plan 2 loans (post-2012), the repayment rate is 9% of income above the £29,385 threshold (2026-27). On £50,000 income with an active Student Loan, the annual repayment is approximately £1,855 or £162/month — reducing borrowing capacity by roughly £25,000–£35,000 at standard assessment rates. If you have a small remaining Student Loan balance, paying it out before applying may be worth the cost in increased borrowing capacity.
What income counts toward borrowing capacity?
Base PAYE salary from permanent employment is counted at 100%. Regular overtime and bonuses with 12+ months history are typically accepted at 80%. Rental income is assessed at 80% (75% at some lenders). Zero-hours and agency income requires 12 months of history and is typically counted at 80%. Self-employed income is generally the lower of the last two years' net taxable income. Government payments including Child Benefit are accepted by many lenders. Child maintenance payments received may be counted with demonstrated history. Investment dividends may be accepted with evidence of consistent receipts.
Why do different banks offer different borrowing amounts?
Because UK expenditure benchmarks, income shading rates, minimum assessment floor rates, DTI caps, and credit policy all differ between institutions. Major banks tend to be more conservative. Regional banks and non-bank lenders sometimes have more flexible policies for specific borrower profiles. The difference between the most and least favourable lender for a given borrower profile can be £80,000–£150,000 in approved loan amount. A mortgage broker can compare your profile across multiple lenders simultaneously to identify the best fit.
Can I borrow more with an interest-only loan?
Generally no — and in some cases, yes but the assessment is more complex. FCA requires lenders to assess interest-only loans at principal and interest repayments for the remaining loan term after the IO period. On a 30-year loan with a 5-year IO period, the lender assesses repayments at P&I over 25 years — which typically produces a higher monthly payment than a standard 30-year P&I loan from day one. Some lenders assess IO loans at a higher assessment rate as well. The net effect is that IO loans usually produce the same or lower maximum borrowing capacity than equivalent P&I loans.
How does The FCA/PRA stress test work?
The FCA and PRA require UK mortgage lenders to assess all mortgage applications at the higher of: the actual loan rate plus a stress buffer (typically 3%), or a minimum floor rate (commonly 5.5–6.0%). If the quoted rate is 6.2%, the assessment rate is 9.2%. This is the rate used to calculate whether your monthly surplus can cover the repayment — not the rate you actually pay. The PRA can adjust requirements in either direction — a reduction would materially increase borrowing capacity across the market.
How are living costs estimated?
UK lenders estimate your minimum living costs using their own household living-cost benchmarks, informed by ONS household expenditure data. These benchmarks vary by household type (single, couple, with/without children) and income bracket. Even if you declare lower monthly expenses, most lenders will assess you on the higher of your declared expenses or their living-cost benchmark floor. This protects against under-declared spending. A single person in a major city on £80,000 might face a benchmark floor of £2,100–£2,400/month regardless of actual spending.
How does a second applicant affect borrowing capacity?
Adding a second applicant typically produces a substantial increase in borrowing capacity, even on a modest second income. The additional income increases the combined surplus, more than offsetting the higher combined living-cost benchmark. A couple with £100,000 + £60,000 = £160,000 combined income generally borrows significantly more than two separate applications at £80,000 each — because the combined household costs do not double when two people live together. The second applicant's credit profile, debts, and income type are all fully assessed, so the benefit depends on the second applicant's profile being clean.
Is borrowing capacity the same as what I can afford?
No — borrowing capacity is what a lender believes you can service based on their assessment methodology. What you can comfortably afford is a personal financial decision that depends on your lifestyle, savings goals, income security, risk tolerance, and life plans. Many financial advisers suggest keeping total housing costs (mortgage, rates, insurance, maintenance) below 30% of gross income. The lender's maximum is not necessarily a target — it's a ceiling. Many borrowers choose to borrow significantly less than their maximum to maintain financial flexibility.
How long is a borrowing capacity estimate valid?
A calculator estimate like this one is valid until your inputs change. Formal pre-approval from a lender is typically valid for 90 days. During that period, you have a reasonable expectation that the lender will approve the specified loan amount, subject to satisfactory property valuation and final credit checks. Pre-approval can usually be renewed or extended if you haven't purchased within 90 days. Changes to income, debts, or interest rates during the pre-approval period may require reassessment.
Can I get a home loan on part-time income?
Yes — permanent part-time PAYE income is assessed at 100% of the documented rate, provided you have been in the role for at least 3–6 months. The borrowing capacity is proportionally lower than full-time income but calculated the same way. A part-time worker earning £55,000 with no debts typically qualifies for £195,000–£250,000. Adding a full-time joint applicant significantly improves the result.
Can I get a home loan while on parental leave?
Most lenders assess your borrowing capacity at your confirmed return-to-work salary rather than your parental leave payment. You'll need a letter from your employer confirming your pre-leave salary and return date. Some lenders require you to have already returned to work. Once back, 3 months of payslips at your current rate is typically sufficient for a full assessment.
What is a guarantor home loan and how does it help?
A guarantor loan allows a parent or family member to use equity in their own property as additional security. This lets you borrow without a full deposit and typically without paying Mortgage Indemnity Guarantee. Your borrowing capacity is still determined by your own income and expenses — the guarantor removes the deposit barrier, not the serviceability barrier. The guarantor's property is at risk if you default, so independent legal advice is essential.
Does a fixed rate increase my borrowing capacity?
Generally no. FCA's 3% buffer applies regardless of whether your rate is fixed or variable. Some lenders assess fixed rate loans at the higher revert variable rate (the rate after the fixed period ends), which can actually reduce capacity slightly. If your goal is maximising borrowing capacity, rate type is less important than reducing debts and card limits before applying.
How much do I need to earn to buy a house in London, Manchester, or Birmingham?
In London, where median house prices in established areas often exceed £500k–£700k, a single borrower typically needs £100,000+ income or a joint application of £80,000+ combined to access most markets. In Manchester, £50,000–£70,000 combined accesses many established areas. In Birmingham, £45,000–£65,000 combined accesses most established suburb markets. These figures assume a 10–20% deposit is available. Shared Ownership allows entry with a 5% deposit on your purchased share.
Which bank lends the most — NatWest, Barclays, HSBC, or Lloyds?
There is no single answer — each bank's approved amount for the same borrower varies by 10–20% due to different affordability models, income shading policies, and DTI caps. NatWest and HSBC tend to use more conservative expense assumptions. Barclays and Lloyds have slightly different income treatment for specific employment types. A mortgage broker can run your profile across all major high street banks plus building societies and specialist lenders to identify which gives you the highest approved amount.
Is it better to rent or buy in the United Kingdom right now?
If your monthly mortgage repayment (shown in the results above) would be within 20–30% of your current rent, buying is typically the stronger long-term financial decision — you build equity rather than paying a landlord, and your repayment is largely fixed while rents rise with inflation. If the repayment would be more than double your rent, continuing to save while renting may make sense, particularly in London and the South East where yields are low relative to prices.
What is the monthly repayment on my loan?
UK mortgages are repaid monthly, and the monthly repayment is shown in the results panel above. It is calculated from your loan amount, interest rate, and term using the standard amortisation formula. The panel also shows a 4-weekly equivalent for those paid every four weeks. Paying slightly more than the contractual monthly amount, or making occasional overpayments where your lender permits them, reduces the total interest paid and shortens the term on a standard 25- to 30-year mortgage.
What is the Lifetime ISA (LISA) and how does it help?
The Lifetime ISA allows first-time buyers aged 18–39 to save up to £4,000/year toward a home deposit, with the government adding a 25% bonus (up to £1,000/year). The property must cost £450,000 or less. LISA doesn't increase your borrowing capacity directly, but accelerates deposit accumulation through the government bonus. The account must be open for at least 12 months before you can use it to buy a home.
Can I count my side hustle or freelance income for a home loan?
Only if you have 2 full financial years of tax returns showing this income. If your UTR is less than 2 years old, most major lenders will not include the income at all. Some specialist non-bank lenders accept 12 months of UTR income with an accountant's letter. If your primary employment is PAYE, that income is still assessed regardless of the side income situation.
Does salary sacrifice or pension salary sacrifice affect borrowing capacity?
Lenders assess your pre-sacrifice gross income, not your reduced take-home pay. For employees who sacrifice into a workplace pension above the auto-enrolment minimum, lenders generally add the sacrificed amount back into assessable gross income — resulting in slightly better capacity than the take-home pay alone would suggest.
What is the difference between an offset mortgage and overpaying?
An offset mortgage links a savings pot to your loan — the balance in it reduces the interest charged without reducing the mortgage balance, and the cash stays accessible. Overpaying reduces the mortgage balance directly. For borrowers planning a future buy-to-let purchase, reducing your main-residence balance through overpayments typically produces better affordability on the new loan than the same amount sitting in an offset pot, because the main-residence repayment commitment appears lower in the lender's assessment.
Can I refinance to increase my borrowing capacity?
Refinancing at a lower rate or extending your remaining loan term reduces your monthly repayment, which reduces your existing debt commitment in a future serviceability assessment. Extending a 20-year remaining term to 30 years can meaningfully improve the capacity calculation for a second property. The trade-off is more total interest — but this strategy is commonly used before investment property purchases.
Where these figures come from
Property and mortgage figures on this page are drawn from HMRC (Stamp Duty Land Tax), The Bank of England (mortgage-rate data), The FCA (mortgage conduct rules), and HM Land Registry (house-price data).
- Stamp Duty Land Tax (SDLT) rates — GOV.UK — Stamp Duty Land Tax.
- UK mortgage rate & lending data — Bank of England — Mortgage lending statistics.
- FCA mortgage conduct rules — FCA — Mortgages.
- UK House Price Index — GOV.UK — UK House Price Index.
- Rental income & Section 24 mortgage interest relief — GOV.UK — Rental income and tax.
Last checked: April 2026. Rates and thresholds are reviewed against the source of record each November, when annual adjustments for the following tax year are published.