The topic of this thesis is “Impacts and consequences of changes in personal income tax”. The main objective of this thesis is an analysis of particular main changes in personal income tax and impacts of these changes on the labour market, public budgets and household consumption. The theoretical part of the thesis is focused on definition of personal income tax and changes made during the year 2020 and 2021 (effective since 2021) such as abolition of the super-gross wage, implementation of two personal income tax rates, increase of a tax discount, new flat-rate tax or increase in tax benefits for children in-cluding abolition of the limit and creation of the possibility of utilization of the diet contribution in cash. Next part of the theoretical part is about the impact of taxes and their changes from the microeconomic and macroeconomic view. The theoretical background is used in a practical part of the thesis with con-crete real examples of changes in personal income tax in the form of calcula-tions and comparison of the situations before and after the changes of income tax acts.