CPI Inflation Calculator — Australia 2026-27

Source: ABS Cat. 6401.0. Values are annual averages (weighted average of 8 capital cities).

The inflation break-even rate

To maintain the real value of savings, your after-tax return must exceed the inflation rate. At 3.5% inflation and a 30% marginal tax rate, you need a gross return of approximately 5.0% to break even in real terms. Most term deposits in 2023–24 at 4.5–5.5% were approximately at this break-even level.

Rule of 72

Divide 72 by the inflation rate to estimate how many years it takes for prices to double. At 3.5% inflation, prices double approximately every 20.6 years. At 7% (2022 peak), prices would double every 10.3 years.

Calculating your real wage change

Enter your salary from a previous year as the “amount,” set the from year to when you last had a meaningful raise, and the to year to the current year. The adjusted amount shows what your salary needs to be today to maintain the same real purchasing power. If your current salary is below this figure, you have had a real pay cut.

Using CPI in salary negotiations

Present the CPI-adjusted figure to your employer alongside your current salary. Frame it as maintaining purchasing power rather than asking for a “raise.” Over 2022–2024, most Australian workers on fixed salaries or low enterprise agreement increases lost 5–10% of real purchasing power.

Source: Australian Bureau of Statistics, Consumer Price Index 6401.0. The 2000 GST introduction caused a 2.8% one-off price level shift that's separately identifiable in the series.

Headline CPI

The headline figure includes everything in the CPI basket — petrol, vegetables, electricity, insurance, holidays. It's volatile because food and energy prices can swing sharply on weather and global oil markets. The headline number is what makes news but can be misleading for monetary policy.

Trimmed mean (the RBA's preferred measure)

Trimmed mean inflation strips the most volatile 15% from each end of the price-change distribution, leaving the middle 70%. This smooths out the impact of one-off energy or food shocks and gives a cleaner picture of broad-based inflation. The RBA targets trimmed mean within the 2-3% band over the medium term — not headline CPI directly.

Weighted median

Weighted median takes the price change of the item where exactly 50% of CPI weight sits above and below. Similar in purpose to trimmed mean but more robust to outliers. The ABS publishes both monthly.

Why the distinction matters in 2026-27

Headline CPI fell faster than trimmed mean through 2024-25 because energy and government rebates (Commonwealth Energy Relief Rebate, state rebates) reduced electricity prices. Underlying inflation (trimmed mean) remained stickier, around 3.4%, which is why the RBA was slow to cut rates despite falling headline numbers.

Living Cost Indexes (LCIs) by household type

The ABS publishes five Living Cost Indexes that better reflect specific household spending patterns: Employee, Age Pensioner, Other Government Transfer Recipient, Self-funded Retiree, and Pensioner & Beneficiary households. Each weights the basket differently.

DIY personal inflation

Track your major expense categories monthly: housing, transport, groceries, utilities, healthcare, recreation. Calculate the year-on-year change for each and weight by what proportion of your budget each represents. Your personal rate often differs from headline CPI by 1-2 percentage points.

Why employees fared worse 2022-24

The Employee LCI ran above headline CPI through 2022-24 because employees disproportionately hold mortgages, and the RBA's 4.25% rate hike cycle dramatically increased mortgage interest costs — a component captured in the LCI but not in the CPI's housing measure (which uses imputed rents).

Indexed government thresholds

Many ATO thresholds are indexed to CPI: tax-free threshold ($18,200, last increased 2020-21 — not currently indexed), HECS/HELP repayment thresholds (indexed annually 1 July), Medicare Levy thresholds, age pension thresholds, and superannuation concessional caps. CPI-driven indexation means most thresholds keep pace with inflation, but some categories (like the tax-free threshold) lag and erode in real terms.

Wage indexation in awards

The Fair Work Commission's annual minimum wage review explicitly considers CPI. The 2024 increase of 3.75% modestly trailed headline inflation. Many enterprise agreements include CPI-linked increases — a critical protection during high-inflation periods.

Indexed government bonds (TIBs)

Treasury Indexed Bonds (TIBs) pay coupons linked to CPI, providing direct inflation protection. The face value grows with CPI; coupons are calculated on the indexed face value. Useful for retirees worried about inflation erosion of fixed-income portfolios.

Real vs nominal returns

A 5% nominal return when inflation is 3% is only a 2% real return. A 5% nominal return when inflation is 7% is a −2% real return — you're going backwards. Always compare investment returns against the relevant inflation rate, not just zero.

"Inflation is just price rises"

Technically yes — but CPI is specifically a measure of price changes for a fixed basket of goods. Asset prices (house prices, share prices) are NOT in CPI. So when people complain that "everything is up but CPI says 3%," they're often comparing asset inflation (e.g. house prices up 10%) to consumer inflation (3%), which are different measures by design.

"CPI excludes housing"

Untrue — housing is the LARGEST single component of CPI at around 22% weight. But the measure used is rents (and some new dwelling costs), not house purchase prices. House prices are tracked separately in the Residential Property Price Index, not CPI.

"The ABS manipulates the figure"

The CPI methodology is published and audited. The ABS makes its data, weights, and method available publicly. Changes in methodology (like switching from monthly to quarterly to monthly again) are documented and academically reviewed. Conspiracy theories about CPI manipulation usually conflate the technical measure with the broader sense of "cost of living."

"Deflation is good"

Mild disinflation (slowing inflation) can be good. Actual deflation (negative CPI) is generally bad — it discourages spending and investment, increases the real value of debt, and creates a self-reinforcing downturn. Japan's 1990s-2010s experience is the canonical case study.