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Analysing government fiscal forecasts and tax and spending.
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Reforming the tax system for the 21st century.
A peer-reviewed quarterly journal publishing articles by academics and practitioners.
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Type: IFS Working Papers Authors: Lambert, P and Ramos, X ISSN: 1742-0415
Inequality of post-tax income among pre-tax equals is evaluated and aggregated to form a global index of horizontal inequity in the income tax. The vertical action of the tax is captured by its inequality effect on average between groups of pre-tax equals. Putting the two together, horizontal inequity measures loss of vertical performance. The identification problem, which has previously been thought insuperable, is addressed by a procedure validating the banding of income units into 'close equals' groups. The horizontal and vertical effects of a major Spanish income tax reform are evaluated. Lines for future investigation are suggested.
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