• Data sources



    This information may not apply to the current year. Check the content carefully to ensure it is applicable to your circumstances.

    End of attention

    Data for this exercise have been sourced from ATO systems and external data sources such as the Australian Bureau of Statistics (ABS).

    External data sources sometimes revise published data. This has the ability to affect some of the indicators in this publication at a later date.

    In January 2010, the ATO began processing tax returns through a new processing system. As a result, all data based on tax returns processed after this date is retrieved through a new system. Where the data source changes during the time series is noted for each impacted indicator.

    In developing the indicators we have identified some data quality and comparability issues as well as impacts from the significant system changes, such as the implementation of the 'New Tax System'. Hence the trends are measured over different periods.

      Last modified: 25 Feb 2011QC 24195