Australia’s annual inflation rate increased to 4.3% in September from 4.0% in August. Housing and transport pressures show why a single headline number cannot settle the interest-rate debate.
Global Economy Charts Research Desk | 28 October 2026
Key indicators
| Indicator | Reading | Period / context |
|---|---|---|
| Headline CPI, annual | 4.3% | September; August 4.0% |
| Trimmed mean, annual | 3.6% | September; revised August 3.5% |
| Housing, annual | 5.2% | September |
| Transport, annual | 8.7% | September |
| Headline CPI, quarterly | 1.3% | September quarter |
The ABS identified housing as the biggest contributor to annual inflation, followed by transport. Automotive fuel rose 9.4% in the month. The September-quarter trimmed mean, on the pre-October 2025 basis, increased 1.0%. That quarterly measure should not be confused with the monthly publication’s annual trimmed-mean rate.
1. Separate the shock from its persistence
Fuel can move rapidly with international supply conditions, while housing prices often adjust through slower contracts and construction costs. A central bank cannot produce extra oil or dwellings by changing interest rates. It can influence demand and expectations, but doing so may impose a wider cost on borrowers before supply constraints ease.
2. A trimmed mean is a filter, not an all-clear
Removing extreme price changes helps reveal the middle of the distribution. It does not mean households avoid the excluded costs. For policy, the relevant question is whether initially concentrated increases spread through wages, services and firms’ pricing decisions. For household budgets, the full basket still matters.
3. Revisions change the comparison
When seasonal factors are updated, the starting point moves. Comparing a fresh reading with an unrevised old number can understate or overstate momentum. Analysts should retain the current vintage of both observations and identify whether they are using annual, monthly or quarterly rates. Annualising one quarter also requires an assumption that its pace repeats.
Scenarios to watch
If fuel stabilises and underlying momentum eases, the headline increase could prove temporary. If housing and services keep pressure broad, the policy trade-off becomes harder. The CPI release alone does not establish the central bank’s next decision.
Sources and methodology
Australian Bureau of Statistics, 28 October 2026. Readings are taken from the linked releases available at preparation. Forecasts and survey expectations are labelled separately from observed outcomes. Interpretive sections and scenarios are Global Economy Charts analysis.
Thumbnail: AI-generated editorial illustration. Chart: Global Economy Charts using attributed source data.
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