This diploma thesis deals with the effective taxation on labour in the Czech republic and compares these trends with the countries of the European Union on the basis of statistical data to Eurostat and the OECD. An effective tax rate is an indicator that measures actual tax burden on taxpayers. In the contrast with nominal rate, this indicator can take into account aspects of the tax system that affect the final tax. First, I deal closely with the indicators used to measure the tax distortion on labour. Emphasis is placed on the implicit tax rate created by Eurostat and which enables the comparison of the tax burden in the CR with the other member states of the Union. The next section gives an overview of the income tax reforms that took place in the CR since 1993. It follows the part of the analysis which compares the implicit tax rates on labour between EU member states. The last chapter describes the tax wedge which complements the analysis of implicit tax rates. I also investigate the impact of labour costs on the tax burden on taxpayers in the EU countries. The aim of this work is to analyze the development of effective tax rates on the labour in the Czech Republic from 1993 to present and identify causes of changes in comparison with EU countries.

In my diploma thesis I deal with an effective tax rate on corporate income. The effective tax rate is an indicator that measures real tax burden, which is due to tax legislation different from tax burden corresponding with statutory tax rate. The aim of my thesis is to analyze the effective tax rate of corporations in Czech Republic and Germany in years 2005 and 2013. In first and second chapter I deal with tax systems in both countries. Following chapter is dedicated to determination methods of effective tax rates. In forth chapter are, based on data from Amadeus database, calculated the effective tax rates of corporations in Czech Republic and Germany. In fifth chapter I focus on causes of differences between effective and statutory tax rate and with reference to the lax I analyze the difference between effective tax rates in years 2005 and 2013.

My diploma deals with the effective taxation from the corporate income. The main part of the thesis is aimed on general progress of the effective corporate tax as well as progress of the effective corporate tax in the Czech Republic. Effective corporate tax is a rate, which reflects the real taxation of corporates in particular states. The effective corporate tax arises from the statutory tax rate, which is adjusted by such items, which affect the final taxation. First part of the thesis deals with the options of set up of effective corporate income tax. The second part deals with the tax system in the Czech Republic. The analytic part is aimed on the progress of the effective tax rate. This part is attended by graphs, which show as well as compare the effective corporate income tax rate in particular states.

This thesis is concerned with effective rates of corporate income taxes in EU in 2011. The aim is comparison of effective rates of corporate income taxes in different sectors of particular states - EU members, measured by real effective tax rate. Another aim is comparison real effective rate od EU corporations with implicite corporate tax rates and uncover, whether the level of real effective tax rate and implicite tax rate depends on GDP in % EU-28, inflation, size of the company, research and development costs, or depreciation of machinery and buildings. Differences in real effective tax rate do exist not only in between EU members, but also in different sectors. Values of implicite tax rate in different countries differ in 2011. Analysis results show, that the only mutual factor, which influences value of real effective tax and implicite tax rates is size of the company. When talking about implicite tax rate, dependence on other factors is not approved. Moreover, real effective corporate tax rate is influenced by GDP in % EU-28, as well as research and development costs. Inflation rate and depreciation time of machinery and buildings are factors, that show no connection between both surveyed taxes. Increase relation betwee real and implicite corporate taxes rate is proved.

The thesis deals with the tax wedge specifically on tax burden on labour in the Member States in the European Union. The issue is described in the theoretical part in the first chapter, the practical part is introduced in the second and the third chapter. The aim of the thesis is to analyze the development the basic micro and macro indicators of tax wedge specifically on tax burden on labour. The analysis including graphs is describe from the beginning of the millennium. The Member States are divided into groups according to measured data in the second part and to the data connection to the European Union in the third part. This classification is done for easier to understand and more meaningful value. All analysis illustrate that the highest tax burden is in Belgium and Denmark, lowest in Bulgaria.

資本所得所負擔的稅額之高低，以及稅負輕重對投資誘因的影響，向來為經濟學者所 關切。然而，由於有數種不同的租稅同時對資本所得課徵，而且，由於通貨膨脹、公 司融資政策、個人所得稅與公司所得稅併存、投資扣抵……等因素，使得吾人不易完 整地表達出資本所得的租稅負擔情形。 在經濟學上，往往用有效稅率（Effective tax rate）來表達資本所得的租稅負擔， 然而何謂有效稅率？在文獻上所討論的有效稅率，可大略地區分為兩大類：平均有效 稅率（Average effective tax rate）與邊際有效稅率（marginal effective tax - rate）。前者是指過去的年度裡，平均每一元的資本所得，負擔多少的稅額；後者是 指未來新增加一單位投資，其賺取的資本所得須負擔多少稅額。平均有效稅率適合用 來表達資本所得過去的稅負情形，但不適於用來衡量租稅對投資誘因的影響；而邊際 有效稅率表達出投資計劃之稅前報酬率，與資金提供者的稅後報酬率之差距，故適合 用來衡量租稅對投資誘因的影響。 本文鑒於一般文獻在討論有效稅率時，往往不加以定義所討論的究竟是平均還是邊際 有效稅率，以致常導致誤解，甚至有部份文獻誤用平均有效稅率，來探討租稅對投資 誘因的影響，因此，本文先對有效稅率一詞的意義，予以釐清；繼而討論各種有效稅 率的正確用途，並且說明邊際有效稅率，與投資誘因之間的關係；最後，本文也嚐試 估計我國資本所得的邊際有效稅率。

In my diploma thesis, I deal with an issue of effective corporate tax rates. The effective tax rate expresses the real tax burden of companies. The effective tax rate is different from the statutory tax rate due to the impact of tax legislation. The aim of my diploma thesis is to analyze the impact of changes in legislation on the level of effective tax rate for companies divided by size and for companies divided by industry. The first chapter describes the crisis in the world and its consequences on taxation in the Czech Republic. In the second chapter I analyze the impact of legislative changes on the level of effective tax rate during the monitored period, i.e. in the years 2006-2016. The third chapter deals with the classification of methods of calculating effective tax rates. In the last chapter, I analyze the impact of changes in legislation on the development of effective tax rates for companies divided by size and for companies divided by industry.

This diploma thesis deals with the trends in the statutory and implicit tax rates of corporations in the Czech Republic. The main goal of this study is determine the causes of differences between implicit and nominal tax rates of corporations in the Czech Republic from 1993 till present. The first descriptive part is devoted to the development of corporate income tax. Furthermore, the study focuses on the classification of the tax burden through the effective corporate tax burden. Another part is devoted to the trends and comparison of implicit and statutory tax rates in the Czech Republic and the European Union and the analysis of the main legislative changes since 1993. The final chapter deals with the comparison of 1996, when the difference between implicit and statutory tax rate was the most significant, with the current year 2012. The aim of the diploma thesis is to find out abnormalities that cause distortion between the rates.

This thesis empirically studies the relation between corporate social responsibility (CSR) and corporate tax avoidance. Based on a sample of 3304 observations between 2002 and 2014, I find that the CSR score of companies is negatively related to their effective tax rate. This indicates that on average, responsible companies are more involved in tax avoidance activities compared to less responsible companies. This result is robust against different sets of control variables. The results of this thesis are contrary towards previous research, where most studies find a negative relation between CSR and tax avoidance. In addition, I examine how four dimensions of CSR are related to corporate tax avoidance and I find that economic performance and environmental performance are positive significant related towards tax avoidance. This indicates that shareholder and client loyalty, as well as resource and emission reduction, relate to a higher extent of corporate tax avoidance.

This paper aims answer the question what is the revenue--maximizing rate of corporate income tax. Before analysis the literature of Laffer curve criticism and conversly literature of Laffer curve applications is summarized. In paper the relationship of tax rates and tax revenues is examined for Czech republic in time period from 1993 to 2009 and for Ireland in time period from 1981 to 2009 by regression analysis. Analysis showed the relationship described by Laffer theory. Revenue--maximizing tax rates reach values of 27,66% for Czech Republic and 25,1% for Ireland. Because the current statutory corporate tax rates are in both countries lower than calculated Laffer points, further reduction in tax rates will result in decline in tax revenues.