A tenth of a point is not news. Three months stuck at 3.6 is
Markets cut the odds of a November rate rise because August inflation came in 0.1 below consensus. The Reserve Bank's own statement says the decision turns on oil, firms' pricing and expectations - not on that tenth.
Australia's central bank, the Reserve Bank, sets the interest rate that feeds through to mortgages and savings, aiming to keep price rises between 2 and 3 per cent a year. On 29 September it raised that rate to 4.60 per cent, the fourth rise this year. The next day, official figures showed prices rose 4 per cent over the year to August - slightly less than forecasters expected - and traders cut the odds of another rise in November.
The August figure missed forecasts by a tenth of a point, which is noise. The real news was that underlying inflation has not budged from 3.6 per cent in three months, and the Reserve Bank said its decision turns on oil and pricing behaviour anyway.
Four per cent inflation was received as good news in Australia this week because the economists polled beforehand had guessed 4.1.
That is the entire surprise. Headline consumer price inflation in the year to August came in a tenth of a percentage point under consensus, and on that, money market pricing for a November increase in the cash rate fell to roughly one in five. A tenth is narrower than the spread between individual forecasters in any given month. It is narrower than the revisions these series routinely carry. Treating it as information is a habit, not an inference.
Look at what else was in the same release. Headline inflation did not fall. It rose, from 3.5 per cent in July to 4 per cent in August, pushed by housing costs and petrol. And the trimmed mean - the measure that discards the largest price moves in both directions, and the one the Reserve Bank of Australia says it watches to see what is happening underneath - sat at 3.6 per cent for the third month running.
The number that didn’t move
The Bank aims to hold inflation between 2 and 3 per cent. Underlying inflation has now been stuck at 3.6 for a quarter of a year. That is the awkward middle: not deteriorating fast enough to force the Board’s hand, not improving at all. A disinflation that stalls above target is precisely the circumstance in which a central bank worries about high inflation becoming normal - which is the language the Board has been using.
So the one genuinely new fact in the August print pointed towards more tightening, not less, and the market moved the other way on a rounding difference.
What the Board actually said
The statement issued the day before the print is worth reading next to the market reaction. The Board lifted the cash rate target by 25 basis points to 4.60 per cent, and the reasons it gave have almost nothing to do with a monthly consumer price index. The conflict in the Middle East has broadened and global energy prices are far above what the August forecasts assumed. Demand related to artificial intelligence is driving up global prices for technology-related goods. Domestic capacity is still under pressure. The Bank’s liaison with firms shows them either raising prices or preparing to. Short-term inflation expectations remain elevated.
Then the decisive sentence: higher fuel prices have partially been passed through. A central bank intending to look through an energy shock - to treat it as a one-off hit to the price level rather than a source of ongoing inflation - does not cite the pass-through as a reason to act. This Board has decided it cannot look through, because expectations are elevated and firms have the room to pass costs on.
If that is the reaction function, the variables that determine November are the oil price, the exchange rate and what businesses do with their input costs. Not whether August printed 4.0 or 4.1.
The case for the market’s read
The strongest version of the other side is that market pricing is not a forecast of the data. It is a probability on one meeting, six weeks out, after a Board that has just moved for the fourth time this year to the highest cash rate in fifteen years. Having moved, it can afford to wait and see, and November brings a full set of quarterly forecasts to wait for.
There is also real evidence the tightening already delivered is biting. The Board’s own statement records that housing prices have fallen in most capital cities and that new housing loans have declined noticeably. Reports of free mortgage-stress counselling services in Victoria closing their books tell the same story from the household end. Policy that works with a lag should weigh that heavily. And Westpac’s chief economist expects a further increase within a couple of months, not none - so the disagreement may be about timing rather than direction.
All of that is fair, and it is why I would not argue a November hold is unlikely. But the reason offered for the repricing was the inflation print, and the inflation print did not support it. If the case for a hold is that the housing downturn is doing the Bank’s work for it, say so. That is a defensible view and a completely different one. It would also be an uncomfortable one, because it means the Board is relying on a mechanism it says it does not fully understand - its statement names uncertainty about the economic effects of the housing downturn as an open question.
Why naming the cause matters
Mis-attributing a repricing is not a harmless slip. It sets the terms on which the next decision is judged. If households and businesses are told rate rises are off because inflation came in soft, and the Board then moves again because crude stayed expensive and firms kept passing it on, the move reads as a reversal. It was not a reversal. It was the stated policy, applied to the variable the Bank said it was watching.
The Board has been unusually explicit about the shock it is responding to. The least the commentary can do is price the same shock.
When it publishes its November forecasts, the Reserve Bank's Monetary Policy Board should set out the oil price path it has assumed and publish the alternative scenarios its statement alludes to - the ones where inflation is higher and activity lower - with the policy response attached to each. It should also say plainly whether it is committed to returning the trimmed mean to 2 to 3 per cent on a stated horizon, or whether a further energy shock would be looked through.
And the forecasting community briefing markets each month could retire the ritual of describing a one-tenth deviation from its own consensus as a surprise. It is not a surprise. It is the width of the error bar.
What would change this view
If the trimmed mean annual rate falls clearly below 3.6 per cent in the September or October releases - to 3.4 or lower - and the Board holds in November with a statement saying underlying inflation is returning to the band, then the flatline I am treating as the story was in fact the last plateau before the descent, and the market read the data correctly while I read the statement too literally.
If that happens, the lesson is that monthly consensus misses do carry signal about the quarter ahead, and the Board's listing of energy and capacity pressures was risk-management language rather than a reaction function. I would drop the claim that the repricing was mis-caused.
Worked from
- November rate rise less likely with inflation data lower than expected
ABC News · 2026-09-30