The thesis examines the influence of the tax deduction by reason of granting the donation on the taxpayers' behavior. The examination is working with Household Expenditure Survey (2004, 2005) of Czech Statistical Office and with author's own questionnaire survey (2007). In the first part the regression of demographical and economic characteristics on the amount of donation and its probability is run. There are the internal opinions of informant according to the filled questionnaire described in the second part. The regression was processed using Logit, Probit and Tobit models; the following section consists of frequency analysis.