Ipsos iris Transition to an 18+ Audience Measurement Universe
As part of its ongoing commitment to delivering transparent, robust, and IAB Australia-endorsed digital audience measurement, Ipsos iris is making an important change to reported audience data.
From the July 2026 reporting period, Ipsos iris audience measurement will be based on Australians aged 18 years and over, with 14–17-year-olds no longer included in reported digital audience figures.
This change reduces the digital audience universe from 22.577 million Australians aged 14+ to 21.272 million Australians aged 18+. The revised audience definition, together with associated methodological refinements and weighting recalibration, introduces a trend break in reported audience data.
As a result, updated guidelines for the use of Ipsos iris data in market communications no longer permit comparisons between historical 14+ audience data (all reporting periods before July 2026) and the new 18+ audience data (July 2026 onwards). Comparisons across the trend break, including measures such as percentage growth or decline in website or app audiences, are not valid and should not be used.
Why is Ipsos making this change?
As part of the ongoing governance and oversight of Ipsos iris by the IAB Australia Audience Measurement Council, an independent audit conducted in 2025 confirmed that the service is well managed and fit for purpose. The audit recommended moving to an 18+ audience measurement universe to strengthen the stability of monthly audience estimates and reduce the impact of sample-related variability.
Building and maintaining a privacy-compliant passive measurement panel of 14–17-year-olds that consistently reflects the broader digital population at sufficient scale is a challenge faced by audience measurement providers globally. By transitioning to an 18+ universe, Ipsos can focus recruitment and panel management efforts where they deliver the greatest benefit to data quality and reliability for digital advertising planning.
For further information contact: support-au@ipsos.com