Complete monthly measure of the CPI
This publication is the first release of the complete Monthly CPI. This marks the transition from the quarterly CPI to the complete Monthly CPI as Australia’s primary measure of headline inflation.
Further details on the complete Monthly CPI are provided here.
Quarterly data
The latest quarterly CPI publication for the September 2025 quarter can be found here.
The ABS will continue to produce a quarterly CPI data series (calculated as the average of the three relevant Monthly CPIs) to support those needing quarterly CPI figures for indexation, contract or other purposes. 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 100.0. The re-referenced quarterly indexes will be published for the first time in the December 2025 CPI release, scheduled for publication on Wednesday, 28 January 2026. Following that publication, quarterly tables will be included in every monthly publication going forward. New quarterly data will be available in every third monthly publication (i.e., March, June, September and December).
The CPI’s new monthly time series
An information paper Introducing the Consumer Price Indexes’ new monthly time series was released on 18 November 2025. It provides an overview of the complete Monthly CPI data from April 2024 – June 2025 and includes insights into new trends in the data and details of new data sources that will underpin some indexes. The paper also provides further information about the approach that the ABS will take to seasonally adjust the short time series in the complete Monthly CPI.
To further support users the ABS has published a paper today that extends this analysis to cover the new monthly Trimmed mean index and data to October 2025.
Updates to the CPI Concepts, Sources and Methods and Frequently Asked Questions (FAQs)
The CPI Concepts, Sources and Methods and CPI FAQs have been updated to reflect the transition to the complete Monthly CPI.