iv Abstract The thesis focuses on base erosion and profit shifting (BEPS) and resulting corporate income tax gains or losses. I first estimated profit shifting semi-elasticity using database of firm-level financial data. Subsequently I used these estimates to calculate corporate income tax gains or losses for individual countries. I estimate several models to see how much the semi-elasticity depends on specification and what affects it. The evidence suggests that companies do shift profits to countries with lower tax rate. The estimated overall profit shifting semi-elasticity ranges from 1.524 to 3.695 for different specifications of the benchmark model. Semi-elasticity of individual countries increases with financial secrecy score. Using statutory tax rate yields stronger results than using country-level effective tax rates calculated from the financial data. The estimated effect on government revenue ranges from 12% loss to 23% gain of corporate income tax revenues. In the sample of 53 countries with sufficient number of observations this translates to overall loss 48 billion US dollars. JEL Classification F23, F68, G38, H25, H26, H87 Keywords base erosion, profit shifting, corporate income tax, financial secrecy Author's e-mail michal.petrous@gmail.com Supervisor's e-mail jansky@fsv.cuni.cz

The main aim of the thesis was the analysis of the tax and accounting system of a land and administrative unit in the Vysočina region. The work focuses on the determination and understanding of basic terms related to the main aim, and furthermore, on the careful observation of the tax and accounting system of the Křelovice municipality. The selected accounting unit was observed in the framework of three years (2010 ? 2012).

The topic of my diploma thesis is tax optimization in a chosen business subject. The thesis aims at finding the most optimum of corporation income tax in order that the selected entity has as low tax liability as possible. Methodology contains description of my suggested variants of optimization: adjusting the value of vouchers, creation of a reserve on repair the company's headquarters, giving free benefits for public benefit purposes, employment of people with disabilities and depreciation that relates to the acquisition of new fixed asset. I have chosen enterprise XYZ, a. s. (company doesn´t want to say name), which carries on in agriculture. The company is one of the most important business corporations operating in the Czech-Moravian Highlands and South Bohemia. Options optimization from methodology are processed in practical part on data enterprise XYZ, a. s. out of year 2016. In the final part of the thesis are calculated the total savings and the optimization options evaluated.

The graduation thesis deals with the tax optimalization in a chosen business subject. The aims of this graduation thesis are aplications of alternative procedure in the tax liability calculation and their showing at chosen business subject. The practical part is aimed at present law adjustment of a corporate income tax and at methodology of process of an individual option of the tax optimalization aimed at carryback, tax abatement and other tax types of the tax optimalization. The data, including the calculation of the 2007 income tax range, of the company Dřevooptima s.r.o. are elaborated in the practical part. By means of the aplication of the individual option of the tax optimalization on the company data there generates different tax optimalizations. Based on the comparision of these options and the existing degree of recommendation, which options of the tax optimalization should the company used in the future to legally reduce its tax liability. For purposes of the better orientation the thesis also contains charts.

The diploma thesis deals mainly with aggressive tax planning of multinational companies but also mentions the practices of domestic enterprises, which lead up to the reduction of the tax liability of the entity. The main idea of the thesis is a description of indicators and the analysis of structures of companies performing aggressive tax planning. The practical part of this thesis contains model examples, which can be realized and against which it is necessary to intervene. The last chapter describes measures by which the OECD and the European Union institutions are trying to eliminate the abuse of tax laws and bilateral treaties by multinational corporations. The Czech Republic has already implemented a number of measures against aggressive tax planning, which success in this diploma thesis is tested by comparing year-by-year revenues changes from corporate income tax.

The thesis deals with the accounting and tax specifics of multi-source financing of non-governmental organizations. The tax aspects of individual sources are ana-lysed from the point of view of corporate income tax and value added tax, both in terms of donor and recipient. Aspects of accountants are described with respect to valid Czech legislation adjusting this issue. The main aim of the thesis is to analyse the accounting and tax implications of multi-source financing of a selected non-governmental non-profit organization and to identify the critical sites resulting from the use of these resources. The conclusion of the thesis is focused on the evaluation of the current status of selected NGOs and supplemented with suggestions for improvement.

Subject of the diploma thesis is to describe common and distinct characteristics of European Union and United States of America's tax harmonization and tax competition, with focus on the corporate income taxes. It comprises characterization of both systems, it defines theirs strong and weak points and it points out significant states regarding tax competition. Main research task of the diploma thesis was to find some improving suggestions for European Union, based on United States of America's experience.

The thesis concerns the income taxation of statutory bodies and their members of the companies in respect of performng responsibilities in a commercial-law relationship. The aim of this thesis is to compare the taxation of statutory bodies in different companies. The majority of the thesis focuses on statutory bodies and their members in the Czech Republic and the remainder on statutory bodies of companies in Germany, Austria, Slovakia, Canada, the USA and Australia.

The thesis entitled Development of the differences between the implicit and the nominal corporate tax rate in the Czech Republic deals with the amount of the implicit and nominal corporate tax rate, particularly the issue of the difference between the amounts of these rates. Examination of the rates follows the description of the characteristics of corporate income tax, the analysis of the advantages and disadvantages of this tax and its share of the total taxation . Furthermore, the thesis analyzed the method of calculating the effective tax rates and implicit tax rates on capital and corporate income. For comparison the thesis includes the analysis of the evolution of nominal and implicit tax rates on corporate income in the European Union and in the Czech Republic . For the final analysis, it is essential that the thesis presented as individual changes in the law on income tax since its introduction into the Czech legal system since 1993 to the present. Only with knowledge of legislative changes, it is possible to determine the relationship between nominal and implicit tax rate on corporate income, which deals with the thesis in the final analysis.

Diploma thesis builds on discussion about harmonization of corporate income tax. It deals with the possibility of determining the tax base of corporate tax in the Czech Republic from the profit recognized in according with IFRS. The thesis describes general differences affecting the amount of profit by using IFRS and by using Czech accounting rules. Then an analysis of several items is made, the differential impact on profit or loss when comparing the two systems is most pronounced. The purpose of this thesis is to suggest a specific adjustment of the Income Tax Law so that the tax burden when using the profit according to the IFRS is the same as in case of using the profit according to the national rules.