Australia Inflation 4.3%: What September's CPI Costs You

Australia's annual inflation rate rose to 4.3% in the year to September 2026, up from 4.0% in August, the Australian Bureau of Statistics (ABS) said on Wednesday 28 October. Prices rose 0.8% in September alone, driven by fuel (up 23.6% in a year) and electricity (up 12.8%). For a typical commuting family, that adds up to roughly $2,270 a year on the same shopping list, and the Reserve Bank meets on Melbourne Cup Day, 3 November, with a hike firmly on the table.

This is the update to our earlier preview, what 4% inflation costs you. The number came in higher than August, and the mix matters more than the headline: the biggest jumps are in things you cannot easily skip, such as petrol, power and housing.

What the ABS actually reported

The ABS monthly CPI for September 2026 shows the headline rate at 4.3%, while the trimmed mean, the measure of underlying inflation the RBA watches most closely, rose to 3.6% (August was revised to 3.5%). Both sit above the RBA's 2–3% target band.

ABS head of price statistics Rachael McCririck said: "Housing was the largest contributor to annual inflation in September, rising by 5.2 per cent." Transport was the second-biggest contributor, up 8.7% over the year, with fuel jumping 9.4% in September after a 14.8% monthly rise in August. The ABS linked the fuel rise to higher world oil prices.

Notice what is not leading the table: food. Grocery prices rose 3.2%, below the 4.3% headline. The pain is concentrated in fuel and power, which means households that drive a lot or run older, less efficient homes are being hit far harder than the 4.3% headline suggests.

Three households, one year: what 4.3% looks like in dollars

To make the percentages real, we applied the ABS annual price changes to three illustrative examples. They are not real people; the weekly amounts are typical-looking budgets we chose, and the extra cost assumes each household buys exactly what it bought a year ago.

Our calculations: weekly spend × 52 × ABS annual change for that item (fuel 23.6%, electricity 12.8%, food 3.2%, rents 3.6%, childcare 4.4%, insurance 5.4%). Your mix will differ.

The commuter family's fuel line alone has grown by about $28 a week. The renter faces the largest total, because her biggest bill, rent, rises every year on top of everything else. The retired couple's total looks smaller, but on a fixed income an extra $27 a week is not small.

The headline says 4.3%. Your kitchen table says it depends on how far you drive and how warm you keep the house.

And if the RBA hikes on 3 November?

The cash rate is 4.60% after four increases this year, as covered in our Melbourne Cup rate decision guide. Before today's figures, markets priced the chance of a November hike at more than 60%, according to the ABC, and RBA deputy governor Andrew Hauser said last week that the inflation outlook was "materially worse" than forecast. The decision is due at 2:30pm AEDT on Tuesday 3 November.

For our commuter family with a $600,000, 30-year mortgage, a 0.25% rise would lift repayments from about $3,694 to $3,792 a month, or $98 more. Put that next to the price rises above and the family is looking at roughly $3,449 a year in extra costs compared with last spring, before anything else changes.

Where the extra $40 a week can come from

You cannot control the CPI, but you can shrink your own version of it. Start with the lines that rose the most:

1. Fuel first. It is the fastest-rising item. Comparing prices with a fuel app, filling up on the cheapest day of your city's price cycle and combining trips can claw back a meaningful slice. Our petrol toolkit has the full list. For the latest pump prices and what a full tank now costs, see Petrol Prices Australia 2026: 242c a Litre, Your Fuel Bill.
2. Power second. Check whether you are on your provider's best offer and compare against your state's Default Market Offer or Victorian Default Offer. Your bill should flag if a better offer exists; if it does not, ask your retailer directly. For the exact words to use, see our 8 scripts to cut your electricity bill.
3. Rent and mortgage third. Renters should check the notice rules in their state before accepting an increase (see our rent increase scripts). Borrowers can ask for a rate review now, before 3 November.
4. Insurance at renewal. Insurance rose 5.4%. Don't auto-renew: get two quotes and ask your insurer to match.
5. Then check your entitlements. If your income has dropped, check Services Australia for payments such as Family Tax Benefit or Rent Assistance, which are means-tested and indexed.

If repayments or bills are already hard, contact your lender or provider before you miss a payment and ask about hardship arrangements. The free National Debt Helpline (1800 007 007) and the government's Moneysmart website can help you work through options.

Does this mean prices will keep rising?

Not necessarily at this pace. Much of the jump is fuel, which follows world oil prices and can fall as quickly as it rose. The ABS noted that fuel is excluded from the trimmed mean, which largely explains why underlying inflation (3.6%) is lower than the headline (4.3%). The RBA will publish updated forecasts with its 3 November decision, so that is the next moment of real clarity.

Questions people are asking

What is Australia's inflation rate now?
4.3% in the 12 months to September 2026, according to the ABS monthly CPI released on 28 October 2026. That is up from 4.0% in August.

Why did inflation rise in September 2026?
Mainly housing (up 5.2%, including electricity and new dwellings) and transport, where fuel rose 23.6% over the year because of higher world oil prices.

Will the RBA raise rates on Melbourne Cup Day?
Nobody knows until 2:30pm AEDT on 3 November. Markets priced a better-than-even chance of a hike before the data, and the higher figure adds pressure. A 0.25% rise adds about $16 a month per $100,000 on a 30-year loan.

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