Australia Inflation Hits 4.3%: RBA Rate Hike Looms as Mortgage Holders Brace for More Pain

Australian mortgage holders face the prospect of a fifth interest rate increase this year after inflation unexpectedly accelerated to 4.3% in September, putting the Reserve Bank of Australia (RBA) under renewed pressure ahead of its November 3 policy decision.

Underlying inflation accelerated to 3.7 per cent in the September quarter, exceeding both the market’s expectations and the central bank’s forecasts. https://t.co/xN0cSo3ZY1

— Financial Review (@FinancialReview) October 28, 2026

The Australian Bureau of Statistics (ABS) reported on Wednesday, October 28, that consumer prices rose 0.8% during September, double August’s monthly increase of 0.4%. Annual inflation climbed from 4.0%, with rising housing, electricity and petrol costs squeezing household budgets.

Financial markets responded by lifting the estimated probability of a November rate hike to around 85%. A quarter-percentage-point increase would take the cash rate from 4.60% to 4.85%, although the RBA has yet to make its decision.

Another Rate Hike Could Add to Mortgage Repayments

The latest inflation reading presents an immediate concern for borrowers already absorbing four interest rate increases in 2026.

If the RBA raises rates by 0.25 percentage points and banks pass the increase through in full, a household with a $600,000 mortgage could pay approximately $92 more each month.

For a $400,000 mortgage, the additional monthly repayment would be about $61. Borrowers owing $800,000 could face roughly $123 more.

These estimates assume principal-and-interest repayments, a 25-year remaining term and a mortgage rate rising from 6.00% to 6.25%. Actual costs will depend on individual loans.

Some lenders have also changed borrowing rates independently of RBA decisions, as seen in earlier Australian bank mortgage rate increases.

Inflation Is Spreading Beyond Petrol Prices

Housing remained Australia’s largest contributor to annual inflation, with prices rising 5.2% over the year to September.

New dwelling costs increased 4.7% as builders passed higher labour and material expenses to buyers. Electricity prices climbed 12.8%, partly reflecting the expiry of government rebates, while rents rose 3.6%.

Petrol prices increased 9.4% during September, following a 14.8% jump in August. Higher international oil prices have added pressure to transport and business operating costs.

Food prices rose 3.2%, while services inflation reached 4.1%, indicating that price pressures are affecting a wider range of household spending.

Persistent construction expenses also complicate housing affordability, a problem examined in Swikblog’s report on Australia’s rising homebuilding costs.

The Number Worrying the Reserve Bank

Beyond the headline CPI figure, policymakers are closely watching trimmed mean inflation, which removes unusually large price changes to reveal broader inflation trends.

That measure increased to 3.6% annually from August’s revised 3.5%. It also rose 1.0% during the September quarter, exceeding the RBA’s earlier forecast of 0.8%.

Deputy Governor Andrew Hauser told a Senate economics committee hearing that the figures were broadly in line with expectations but remained too high.

The RBA targets annual inflation of 2–3%, meaning underlying price pressures remain above its preferred range.

Markets React as Economists Change Their Forecasts

Before the inflation report, financial markets estimated approximately a 60% probability of another rate increase. That rose to around 85% following the release.

The Australian dollar strengthened against the US dollar, while the ASX 200 initially declined as investors assessed the prospect of tighter monetary policy.

Oxford Economics Australia, which previously expected another increase in early 2027, now anticipates a November hike.

KPMG chief economist Brendan Rynne also sees a stronger case for immediate action. Betashares economist David Bassanese expects a possible November increase followed by a December pause.

Chalmers Warns Inflation Relief Will Take Time

Treasurer Jim Chalmers blamed part of the inflation surge on the Middle East conflict, saying higher global oil prices were affecting Australia and other advanced economies.

However, domestic demand, weak productivity growth and persistent services inflation have also contributed to the problem.

Chalmers said the government could not afford to continue temporary fuel excise relief indefinitely, citing budget pressures.

He expects inflation to return to the RBA’s target range towards the end of 2027, although those projections remain subject to revision.

November 3 Decision Could Set the Tone for 2027

The RBA will begin its policy meeting on November 2 and announce its decision the following afternoon, alongside updated economic forecasts.

RBA chief economist Sarah Hunter has said current indicators do not suggest Australia is approaching a recession in the near term, although economists warn prolonged tightening could weaken growth.

The next monthly inflation release is scheduled for November 25, according to the Australian Bureau of Statistics.

For households, the immediate question is whether another increase will arrive before Christmas. Even without a November hike, inflation remaining above target could keep mortgage rates and living costs under pressure into next year.