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  • Medium business income tax gap 2017-18

    This information is for historical purposes only. If you require previously published content for past estimates, please email

    In this document, you'll find information about the medium business income tax gap. This gap forms a part of our overall tax performance program.

    For the purposes of estimating this gap, we define the medium business population as companies with a group turnover of between $10 million and $250 million, as well as the individuals controlling these companies. Most companies in our analysis had a turnover of less than $50 million.

    Entities linked to a high wealth group are excluded from this analysis and are included in the High wealth income tax gap Where income earned from trusts and partnerships is distributed to companies or individuals in the medium business population we recognise the tax effect here.

    For 2017–18, we estimate the net income tax gap for medium business to be $860 million or 6.2%. We estimate that medium businesses paid more than 93% of the total theoretical tax payable over this period.

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      Last modified: 11 May 2022QC 69572