Australia Annual Trimmed Mean CPI YoY
An annual underlying-inflation measure derived from Australia’s Consumer Price Index by excluding the most extreme component price movements.
Full explanation
Australia’s Annual Trimmed Mean CPI is a measure of underlying consumer-price inflation over the previous 12 months. It reduces the influence of unusually large price increases and falls, aiming to show broader inflation pressure across the household spending basket. The Australian Bureau of Statistics ranks the annual price movements of CPI component series, removes the highest and lowest 15%, and calculates the average movement of the middle 70%. Although calendars may label it “RBA,” the ABS publishes the CPI data; the label reflects the Reserve Bank of Australia’s attention to underlying inflation measures.
Why traders watch it
Underlying inflation can influence expectations for Reserve Bank of Australia policy, Australian interest-rate pricing and demand for the Australian dollar. It is commonly assessed alongside headline CPI and the quarterly trimmed-mean measure.
Market interpretation
- AUD
- May affect expectations for Australian monetary policy and therefore prompt repricing in the Australian dollar.
- Australian government bonds and interest-rate markets
- May influence expectations for the future path of policy rates and inflation.
- Australian equities
- May contribute to changes in discount-rate and domestic-demand expectations.
Stronger vs weaker outcomes
A higher-than-expected annual trimmed-mean reading may be interpreted as more persistent or broadly based inflation pressure, while a lower-than-expected reading may be interpreted as softer underlying inflation. The market response can also depend on headline CPI, services and housing-price components, the quarterly inflation measures and changes in policy expectations.
A higher-than-expected reading may be seen as an indication that underlying inflation is proving more persistent or widespread than anticipated.
A lower-than-expected reading may be seen as an indication of softer underlying inflation pressure.
Higher readings can suggest firmer broad-based inflation pressure; lower readings can suggest softer pressure, subject to the wider CPI details.
Typical volatility
High. This monthly annual-trimmed-mean series is an analytical underlying-inflation indicator and is not identical to the ABS’s principal quarterly trimmed-mean measure. It should be read with the release’s coverage, methodology and companion CPI measures in mind.
Trading considerations
- Compare the result with market expectations and the headline CPI measures released at the same time.
- Check whether price pressure is concentrated in particular CPI groups or broad across categories.
- Distinguish the monthly annual-trimmed-mean indicator from the principal quarterly trimmed-mean measure.
- Expect liquidity conditions and spreads to change around a scheduled CPI release, particularly in AUD pairs.
- Review revisions, methodology notes and changes in policy-rate expectations rather than relying on a single inflation measure.
Educational guidance only — never a trading signal or recommendation.
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