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...