Australia Inflation Accelerates to 4.0%, Keeping Pressure on RBA

Australia’s inflation rate accelerated in August, with the Consumer Price Index rising 4.0% from a year earlier, up from 3.5% in July. The rebound puts headline inflation well above the Reserve Bank of Australia’s 2% to 3% target range and keeps attention on how quickly price pressures can be brought down after another interest-rate increase.

The timing is notable. The CPI report arrived one day after the RBA raised its cash rate target by 25 basis points to 4.60%, a move the central bank said was needed because inflation remained too high and upside risks were materialising. The August data strengthens the case for continued caution, although the details were less uniformly hawkish than the 4.0% headline suggests.

According to the Australian Bureau of Statistics, the CPI rose 0.4% in original terms during August and 0.7% on a seasonally adjusted basis. Trimmed-mean inflation, which removes some of the largest price movements to give a clearer view of underlying pressure, was 3.6% over the year and unchanged from July. That distinction matters because the headline rate was pushed higher by several large price moves, especially in transport and electricity.

Fuel and housing costs drove the August rebound

Transport prices rose 4.2% in August and were 5.6% higher than a year earlier. Automotive fuel was the largest immediate source of pressure, jumping 14.8% during the month and 13.5% over the year. The ABS attributed the monthly increase to higher world oil prices and the unwinding of the remainder of the federal government’s fuel-excise relief measures in August.

Housing inflation also remained strong. Housing costs were 5.7% higher than a year earlier, up from 5.0% in July. Electricity prices rose 13.2% over the year, largely reflecting the end of Commonwealth electricity rebates and the timing of rebate payments in 2025. New-dwelling prices increased 5.4%, with builders passing through higher labour and material costs, while rents were up 3.6%.

The mix shows why the headline number cannot be reduced to a single cause. Goods inflation accelerated to 4.2% from 3.2% in July, while services inflation held at 3.7%. Tradable inflation, which is more exposed to international influences such as fuel and imported goods, rose to 2.9% from 1.7%. Non-tradable inflation, which is more closely tied to domestic conditions such as housing and education, was 4.5%, slightly above July’s 4.4%.

For households, some of the fastest increases remained concentrated in less discretionary parts of the budget. Non-discretionary inflation was 4.7% over the year, compared with 3.0% for discretionary items. Food and non-alcoholic beverages rose a more moderate 3.0%, while insurance and financial services increased 3.5% and education rose 4.7%.

Underlying inflation stayed at 3.6%

The steadier underlying measures are the main counterweight to the sharp headline acceleration. Trimmed-mean prices rose only 0.2% in August and 3.6% over the year, matching the July annual rate. The weighted median measure was also 3.6% annually. CPI excluding volatile items was 3.7%, while the seasonally adjusted all-groups measure was 3.9% over the year.

Those figures suggest August did not produce a fresh acceleration in every measure of inflation. The headline CPI moved from 3.5% to 4.0%, but the RBA’s preferred assessment of persistent inflation will depend on whether broader price pressure eases over coming months. The central bank has repeatedly stressed that a single monthly reading is only one part of the information set used to judge the outlook.

Even so, 3.6% underlying inflation remains above the target range. Domestic price pressure has also not disappeared: non-tradable inflation was 4.5%, services inflation was 3.7%, and housing inflation was 5.7%. Those readings sit alongside the external energy shock that has lifted fuel costs and raised the risk that businesses pass higher transport and input costs into other prices.

The RBA had already tightened before the CPI release

The Reserve Bank raised the cash rate target to 4.60% at its September 29 meeting, making the latest increase the fourth rate rise of 2026. The Board said recent Australian growth and inflation data had been higher than expected, global oil-supply disruptions were keeping upward pressure on energy prices, and domestic capacity pressures were still contributing to inflation.

The RBA also said the three earlier increases this year had tightened financial conditions and that the economy appeared to be slowing. Growth in output had moderated, consumer spending was showing signs of easing, housing prices had fallen in most capital cities and new housing loans had declined. At the same time, the Board said inflation was still too high and that it was prepared to raise the cash rate further if needed to return inflation sustainably to target.

Governor Michele Bullock reinforced that point at the post-meeting media conference. Speaking before the August CPI figures were released, she said the Board would not put excessive weight on one number and was more focused on whether current financial conditions were restrictive enough to bring future inflation down. That makes the August report important, but not decisive on its own.

The next test will come quickly. The ABS is scheduled to release September CPI data on October 28, and the RBA’s next monetary policy decision is due on November 3. Between those dates, policymakers will be watching whether the August surge in fuel and electricity costs begins to spread more broadly, and whether underlying inflation finally moves below the 3.6% rate that has persisted through recent months.