Complete monthly measure of the CPI
Australia’s primary measure of headline inflation has transitioned from the quarterly CPI to a complete monthly measure of the CPI. Further details on the monthly CPI are available in the following links:
Media statement: Australia’s first complete Monthly CPI
Introducing the new monthly CPI time series
Introducing the new monthly CPI time series - extended analysis and Trimmed mean
Quarterly data
The latest quarterly CPI publication for the September 2025 quarter can be found here.
The ABS will continue to produce quarterly CPI data (calculated as the average of the three relevant Monthly CPIs) to support those needing quarterly CPI figures for indexation, contract or other purposes. December quarter 2025 CPI data will be published on Wednesday, 28 January 2026. Following that publication, quarterly tables will be included in every monthly publication going forward. Data for the most recent quarter will be added to the quarterly tables in every third monthly publication (i.e. March, June, September and December).
Re-referencing the quarterly CPI data
The previously published quarterly index will be re-referenced and aligned to the new monthly series. September 2025 will serve as the link period where the index will equal 100.00. This process will create a continuous historical time series for the quarterly CPI. While the levels of the quarterly CPI index will change due to re-referencing, the percentage movements of the index will not be revised. The re-referenced quarterly indexes will be published for the first time in the December 2025 CPI release on Wednesday, 28 January 2026.