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  • Reliability

    Our estimate of the GST gap has been assessed by an independent expert panel. Based on advice from the panel, the reliability rating for this estimate is medium (with a score of 19).

    Data used to estimate the theoretical tax liability is largely based on external data sources and incorporates a factor for the shadow economy.

    The methodology is based on the approach recommended by the International Monetary Fund (IMF) and applied to the value added tax (VAT) gap or GST gap estimation globally. We retain some concerns over the completeness of the tax base covered, and the estimates for concessional and exempt expenditure.

    Figure 3: Reliability rating scale from very low to very high – GST gap

    Figure 3: This image is a graphical representation of the reliability rating for the current large super funds income tax gap estimate. It graphically represents a rating of medium, which is a score between 16 and 20. The maximum score is 30.

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      Last modified: 11 May 2022QC 69533