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Neither personal income tax nor social security is harmonised within the EU. Social security systems are coordinated at EU level whereas personal income tax in cross-border situations is governed by respective double tax treaties. In most EU countries, personal income tax and social security contributions are relatively distinct payments. This article examines problems surrounding the interaction between personal income tax and social security contributions on a national and international level based on a case study of cross-border employment between the Czech Republic and Denmark. As the Czech and the Danish systems are designed very differently, the case study allows for clear illustration of the issue at-hand. The aim is to identify the elements influencing the impact of different coordination rules in personal income tax and social security contributions, illustrate and discuss the potential problems of such mismatches between the two payments. The impact on final payments differs, not only due to the different levels of coordination of the payments, but also due to the different designs of the two national systems. Thus, it would be very difficult to address all the scenarios with a one size fits all measure for all the EU Member States that would overcome the differences in this coordination.

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Personal income taxation in the Czech Republic has undergone significant changes in the last 20 years. Among main changes is replacing of deductions from the tax base with tax credits in 2006, as well as linking income tax and contributions on compulsory insurance in the form of so-called super-gross wage with the simultaneous introduction of a flat tax rate and introduction of maximum assessment bases for compulsory contributions in 2008. In this paper, we quantify the fiscal impacts of significant changes using macroeconomic and microeconomic approaches. We compare the results within each other, but also with the expected fiscal impact stated in the explanatory reports of the amending laws. The results show good consistency in estimates of the fiscal impact of tax and contribution reforms and confirm four fiscally significant reforms from 2000 to 2018. The expected negative and positive effects of changes in income tax presented in the explanatory reports are generally lower than in our calculations. Improving the quantification of fiscal impacts is essential for the adoption of an efficient and rational tax policy.

Perception of tax evasion by individual citizens is of considerable interest to politicians, since people's perceived attitudes affect the approach to tax compliance throughout the society. It is thus worth identifying personal characteristics that are related to a higher degree of tolerance and justification for tax evasion. Based on the 2008 European Values Survey data and using descriptive statistics, the paper discusses the relationship between the respondents' characteristics and their tendency to justify tax evasion. The study finds a strong relationship between this tendency and age, educational attainment and economic activity, the two other variables (parenthood and income) indicating only a weak relationship. Moreover, the current issue allows us to convincingly argue against the regression analysis stereotypes which often yield biased and confl icting results. The paper confirms our constructive criticism, thus opening up space for an extended discussion of a more balanced use of both descriptive statistics and regression models.