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How we make sure the tax gap estimate is reliable.

Last updated 29 October 2023

We sought feedback and advice from external experts on the appropriateness and robustness of our new estimation method based on a multi-stage regression approach. They have supported our assessed reliability rating of medium with a score of 20.

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

 Figures 3 shows the reliability rating for the current wine equalisation tax gap estimate. The rating scale includes very low which is a score between 0 and 10, low between 11 and 15, medium between 16 and 20, high between 21 and 25 and very high between 26 and 30. The WET gap estimate has a rating of 20 which is medium.