TLDR
Australia's trimmed mean inflation surged 0.5 per cent in July, double the consensus forecast and the largest monthly rise in a year, leaving the annual rate stuck at 3.6 per cent. Deutsche Bank now calls a September rate hike, and market pricing for that move has roughly doubled to 36 per cent.
KEY TAKEAWAYS
A number the board cannot easily dismiss
The monthly CPI indicator released on 26 August put the trimmed mean at 0.5 per cent for July 2026, the largest single-month rise in the core measure over the past year, against a market consensus of 0.3 per cent.[1] The annual trimmed mean held at 3.6 per cent, unchanged from June, sitting more than half a percentage point above the top of the Reserve Bank of Australia's 2 to 3 per cent target band.[1]
Headline CPI came in at 1.0 per cent for the month, above forecasts of 0.8 per cent, though the annual headline rate eased to 3.5 per cent from 3.8 per cent in the year to June.[1] That softening in the annual headline figure will offer the board little comfort given where the core monthly read landed.
Fuel drove the headline; the trimmed mean is the problem
Rachael McCririck, Head of Price Statistics at the Australian Bureau of Statistics, said that on a monthly basis, automotive fuel prices rose 7.5 per cent in July after falling for three months in a row, driven by higher world oil prices and the partial unwinding of the federal government's fuel excise relief measures.[2] The fuel surge flatters the headline and also obscures it: the trimmed mean strips out exactly these kinds of volatile components, which is why the 0.5 per cent core read carries the heavier analytical weight.
Monthly CPI indicators give the Reserve Bank a timelier signal than the official quarterly aggregates, allowing the board to detect turning points rather than wait for three months of data to accumulate. The July print offers no turning point, moving the needle in the wrong direction.
Deutsche Bank moves first
Phil O'Donaghoe, Chief Economist for Australia at Deutsche Bank, said the July trimmed mean figure was intolerably high and the bank moved to a forecast of a 25-basis-point hike at the September meeting.[4] O'Donaghoe added: While the RBA remains focused on the quarterly CPI, we see little to be gained by delaying a hike until the November meeting, though we acknowledge that more dovish members of the board may be tempted to do so.[4]
Market pricing for a rate increase at the September meeting roughly doubled after the data landed, reaching 36 per cent. That remains a minority probability, but a doubling of implied odds in a single session reflects how far outside consensus the print fell.
What a fourth hike would mean for borrowers
The current tightening cycle has delivered three quarter-point increases, in February, March and May 2026, lifting the cash rate to 4.10 per cent.[5] The Monetary Policy Board's next meeting falls on 28 and 29 September 2026, with the decision announced on 29 September.[3]
A fourth 25-basis-point move would add roughly $100 to the monthly repayment on a $500,000 thirty-year mortgage at current rates, extending the pressure on household budgets that have absorbed three increases in four months. The board will weigh that against a trimmed mean that, on the monthly read, shows no sign of the sustained deceleration the RBA has been waiting to see before standing down.
SOURCES & CITATIONS
FREQUENTLY ASKED QUESTIONS
What is the trimmed mean CPI and why does the RBA watch it?
When does the Reserve Bank next decide on interest rates?
How much would a fourth rate hike add to mortgage repayments?
Elias Thorne writes about interest rates, the bond market and the Reserve Bank. He is interested in what monetary policy actually does to household budgets, and in the long stretches of economic history that tend to repeat.
