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Ability to predict the impacts of proposed tax changes is crucial for effective and transparent tax policy. The ex-ante impact evaluation of proposed changes is in the Czech Republic part of the Regulatory Impact Assessment process and assumed effects are published within the reasoning reports to the amendment laws. We use the top-down approach to calculate ex-post the impacts of the most significant changes in personal income tax and contribution on obligatory insurance on public revenues and compare the results with forecasted effects from reasoning reports. We use data for the period of 1994 to 2014 and create three models to quantify the impact on personal income tax revenue, social security contribution and health insurance contribution. The results show the tendency to underestimate real effects about a third to a half when calculating the projected impact on public revenues. For more accurate estimations we recommend higher transparency in presented methodology within the Regulatory Impact Assessment process and evaluation by independent institution for changes with significant impact.

Evaluation of the Impacts of Selected Tax Reforms Influencing the Income of Individuals in the Czech Republic