Australia’s Inflation Heats Up to 4.3%, Core CPI Puts RBA on Alert

Australia’s annual inflation rate rose to 4.3% in the 12 months to September 2026, above forecasts of 4.2% and up from 4.0% in August.

Higher fuel prices drove most of the jump, but the Reserve Bank of Australia’s (RBA’s) preferred core measure also ticked up to 3.6% year-over-year, which keeps a November rate hike in play.

Australia CPI September 2026: Key Takeaways

• Headline CPI:4.3% year-over-year in September, beating the 4.2% forecast and up from 4.0% in August.
• Monthly CPI: Prices rose 0.8% month-over-month (0.6% after seasonal adjustment), above the 0.7% forecast.
• Trimmed mean (core) CPI:3.6% year-over-year, in line with forecasts and up from a revised 3.5% in August.
• Quarterly core inflation: The trimmed mean rose 1.0% quarter-over-quarter in Q3, above the RBA’s own forecast of 0.8%.
• Automotive fuel: Prices jumped 23.6% year-over-year and 9.4% month-over-month on higher world oil prices.
• Electricity: Costs climbed 12.8% year-over-year as government power bill rebates ended.
• Next up: The RBA decides on rates on November 3, with the cash rate at 4.60%.

What Were Australia’s CPI Results for September 2026?

The Australian Bureau of Statistics (ABS) reported that consumer prices rose 4.3% year-over-year in September. The Consumer Price Index (CPI) tracks the price of a basket of goods and services that households buy.

On a monthly basis, prices rose 0.8% month-over-month, up from 0.4% in August. This release also included quarterly data. Headline CPI rose 1.3% quarter-over-quarter in the July to September period. Inflation now sits well above the RBA’s 2% to 3% target range.

What Drove Australian Inflation Higher in September?

Housing made the largest contribution to annual inflation, rising 5.2% year-over-year. Builders passed higher labor and material costs into new home prices (+4.7% year-over-year). Electricity bills jumped 12.8% after Commonwealth power rebates expired. Rents rose 3.6%, the same pace as in May.

Transport came second, with prices up 8.7% year-over-year. Fuel did most of the work there. Pump prices rose 23.6% from a year ago and 9.4% in September alone, according to the ABS. School holidays and major sports events also pushed domestic travel costs up 8.0% month-over-month.

Is Underlying Inflation Getting Worse?

Yes, though at a slower pace than the headline number. The trimmed mean removes the biggest price swings each month, up and down, to show the underlying trend. Think of it as judging a class by its middle students, not the top and bottom scorers. It rose to 3.6% year-over-year, up from 3.5%.

The ABS said it left automotive fuel out of the trimmed mean in September. That explains most of the gap between 4.3% and 3.6%.

Other measures tell a similar story. CPI excluding fuel and fruit and vegetables rose 3.7%, and services prices rose 4.1%. Prices for essentials, which the ABS calls non-discretionary items, rose 5.2%. Households feel these costs most, because they can’t easily cut back on power, rent, or fuel.

What Does This Mean for the RBA?

The RBA has raised its cash rate four times in 2026, most recently to 4.60% in late September. The cash rate is the main interest rate the RBA uses to cool or support the economy. The quarterly trimmed mean of 1.0% came in above the bank’s own 0.8% forecast.

Today’s inflation data confirms broad price pressure in housing, services, and essentials. That makes a hike on November 3 more likely. Policymakers still face one risk on the other side: unemployment hit 4.7% in September, a five-year high.

What Does This Mean for AUD Traders?

Ahead of the data, AUD/USD traded near 0.7027, close to one-month highs. Markets had priced in about a 70% chance of a November hike. A higher RBA rate would widen Australia’s interest rate differential, the gap between Australian and U.S. rates. Investors tend to buy currencies that pay higher returns, so a wider gap usually supports the Aussie.

Traders had priced in most of the hike case before the data, so a further AUD rally may stay limited. You also have two more risk events today. RBA Governor Michele Bullock speaks to Parliament, and the Federal Reserve announces its rate decision. Either one could move AUD/USD more than the CPI print.

Frequently Asked Questions About Australia CPI

What does Australia’s CPI measure?

The CPI measures changes in the prices Australian households pay for goods and services. The ABS collects prices across eight capital cities each month. It covers items like food, rent, fuel, electricity, and travel.

Why does Australian CPI matter for forex traders?

Inflation data shapes RBA rate decisions. Higher inflation raises the odds of rate hikes, and higher rates tend to support the Australian dollar. Weaker inflation can do the opposite.

What happened to Australian inflation in September 2026?

Annual CPI rose to 4.3% from 4.0%, beating the 4.2% forecast. Fuel, electricity, and new home prices led the gain. The trimmed mean rose to 3.6% year-over-year.

Will the RBA raise rates in November 2026?

Markets saw a hike as more likely than not before today’s data. Core inflation beat the RBA’s own quarterly forecast, which strengthens the hike case. Rising unemployment gives the RBA a reason to wait.

What should traders watch next?

Watch Governor Bullock’s comments today and the RBA decision on November 3. The Fed decision also matters for AUD/USD. Oil prices will keep shaping Australia’s headline inflation in the coming months.