Thesis is focused on fight against indirect tax evasion. This topic was selected because it is a current issue. This is evidenced by media coverage regarding revealed tax evasion schemes; total estimated volume of tax evaded and increased activity of legislator in this field. The thesis is divided into three parts. In first part, I start with a general description of indirect taxes. I subsequently proceed with description of individual indirect taxes in the Czech Republic - value added tax, excise tax, and energy tax - and a brief summary of their evolution, main principles of functioning and their sources of law, both Czech and European. In second part, I tackle the problem of tax optimization, in particular the difference between legal and illegal methods of lowering ones tax. For this purpose, I go into more detail in explaining differences between tax planning, tax avoidance and tax evasion. I also draw attention to problems related to distinguishing these categories and to how these are interpreted differently by tax authorities in Anglo-Saxon and Continental area. After establishing theoretical background, I proceed by describing particular methods of evading tax, focusing mainly at illegal imports and carousel fraud, which, according to the Ministry of Finance, deprives Czech Republic of CZK 15...