The aim of this master thesis is the comparison of selected elements of the tax and social security systems in the Czech Republic, Slovakia, Austria and Germany, which are related to employees and employers and it is counted with them in model examples, then evaluation of advantages and disadvantages of employees´ migration under the structure of posting between the Czech Republic and other countries and finally the comparison of employees´ incomes after receiving benefits from social security system of each country (especially old age pension and parental allowance). In the first part of the thesis there is explained problematics of double tax treaties and EU coordination of social security. Then there is the comparison of above mentioned elements of the tax and social security systems in each country. In the last part I apply findings on model employees and I make a conclusion from amount of their net incomes. Migration to another EU member country is the most profitable for employee who is subjected to taxation in other EU countries but he remains under the Czech social security system. In terms of social benefits, retired people are supported the most in Austria and families with children in Germany.

The thesis is focused mainly on changes in the field of tax planning, global exchange of information and documents, on the basis of which the information exchange is realized. The thesis is also devoted to protection of identity of owners of assets and income, and various instruments which allows preserving it. The practical part of the thesis is formed by a case study. The aim of the thesis is to coherently examine and summarize the changes that took place in international tax planning over the past few years, mainly because of increased international cooperation in tax matters.

The thesis deals with issue of international double taxation with respect to taxes on income and capital. The aim of the thesis is to provide a comprehensive overview of the issue of concluding international double tax treaties and to verify, whether the differences in their provisions can be significant enough to affect activities of internationally active entities. The body of the thesis is divided into three chapters. The first chapter explains what double taxation is, how it occurs and the possible ways of its elimination. It also deals with related tax evasion. The second chapter is devoted to bilateral and multilateral tax treates. The emphasis is on OECD and UN model conventions and related issues of exchange of information, non-discrimination and dispute resolution. The third chapter focuses on the approach of the Czech republic to enter into tax treaties. Its main part is devoted to a comparison of tax treaties which the Czech republic has concluded with the United States of America, Slovakia and Germany.

The master's thesis deals with the optimization of the tax burden of a concern based in the Czech Republic, which receives income from abroad. Optimization should be achieved through a change of the subsidiary's head office. Another proposal is a creation of a permanent establishment abroad. The output of the work is to decide on the most suitable structure of the concern in terms of head office and the number of its companies. The decision will be made on the basis of a comparison of the results of tax obligations calculated according to the legislation of the proposed countries and the related tax levies. The diploma thesis is focused on corporate income taxation, as the subjects of the group are limited liability companies. This issue will be explained theoretically on the basis of professional literature and practically using a comprehensive example.

租稅協定不僅協調各國間稅收關係並妥善劃分課稅管轄權，進而降低企業全球化經營下所面臨的租稅課徵不確定性。然而國外文獻關於租稅協定對直接投資或海外關係企業活動之成效仍有諸多爭議，且國內仍未有利用長期性個體資料來檢視租稅協定效果的研究，因此本文以 2000 年至 2013年台灣上市公司之海外關係企業的財務資料進行分析。另外，因近年各國日益重視反避稅措施與跨國間稅收的徵管合作，故本文也進一步探討利益限制條款和資訊交換的嚴謹程度對於海外關係企業營運活動之影響。 本文建構三個固定效果模型來分析不平衡追蹤資料，其中模型一分析租稅協定對於海外關係企業營運活動的影響，而模型二檢視利益限制條款是否為其中的重要因素，模型三則分析資訊交換條款的嚴格程度是否影響海外關係企業的營運規模。實證結果顯示不論是租稅協定本身、利益限制或是資訊交換皆為影響台灣上市公司海外關係企業營運活動之重要關鍵。租稅協定的生效不僅造成海外關係企業的銷售額下降，並隨著資訊交換規範越嚴格，其下降的幅度越大。最後，在細分不同產業的條件下，得歸納出租稅協定帶來的效果並不一致之結論。

Les enjeux présentés par la puissance financière des fonds souverains et les réactions politiques des pays d’accueil appellent naturellement à s’interroger sur la façon dont la fiscalité appréhende ces questions. La réponse nécessite de se placer tant sur le plan du droit interne français que sur celui de la fiscalité internationale. La présente étude procède à une analyse comparée de la fiscalité directe applicable aux fonds souverains en France et aux Etats-Unis. Cette analyse se poursuit à travers l’examen de conventions fiscales conclues par la France mais aussi par des Etats étrangers détenteurs de fonds souverains. La question de l’application des conventions fiscales aux fonds souverains est évoquée à travers l’exposé des modèles de conventions fiscales de l’OCDE et des Etats-Unis. Le statut fiscal des fonds souverains est confronté à celui des apporteurs de capitaux privés au regard de la distorsion de concurrence fiscale entre investisseurs. En l’absence de dispositions législatives précises, de doctrine administrative et de jurisprudence, ces travaux sont principalement fondés sur une interprétation des faits et du droit positif. Les solutions proposées tentent de remédier aux problématiques ainsi dégagées. / The growing number of investments made by sovereign wealth funds and the reactions of host countries has raised questions regarding the tax treatment of those public financial entities. Answering these questions implies to analyze the tax legislation on both a national and international level. In this respect this paper compares the direct taxation of sovereign wealth funds investments in France and in the United States. It is then followed by an analysis of some tax treaties signed by France as well as tax treaties signed by countries owning sovereign wealth funds. Questions related to the application of tax treaties to sovereign wealth funds are examined through the presentation of the OECD model tax convention and the United States income model tax convention. We then compare the tax status of sovereign wealth funds and private investors regarding tax competition and portfolio choices. We will see through the lack of tax regulations, guidance and the absence of court decision that this study is mainly based on an interpretation of the facts and the law as a consequence. The solutions provided in this paper aim at clarifying the issues we have identified. Hopefully this will raise further interrogations and will be followed by other studies.

In the first section of the article, the two types of international double taxation, as well as the main mechanisms for its elimination, are reviewed. Subsequently, is analyzed the indirect tax credit in Peruvian tax law. The main section is devoted to the indirect tax credit set forth in the tax treaties concluded by Peru, including its practical application and the relation between such treaties and domestic legislation. / En las primeras secciones del artículo se revisan los dos tipos de doble imposición internacional, así como los principales mecanismos para su eliminación. Más adelante se analiza el crédito tributario indirecto en la ley tributaria peruana. La sección principal está dedicada al crédito indirecto previsto en los convenios tributarios suscritos por el Perú, incluyendo su aplicación práctica y la relación entre dichos convenios y la legislación doméstica.

This master thesis deals with the characteristics of tax havens, approach beneficiary companies and way of their use and potential abuse. The first part defines basic terms, which are tax havens are closely linked. The second part is devoted to the characterization chosen tax havens in different areas of model-based taxation example of two types of companies. The third part contains the suggestions and recommendations for setting up a company in a tax haven.

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