The importance of studying tax evasion derives from its effects. The state budget of public revenues, which could be used to finance public health services, education, public order and safety, etc., is being damaged by evasion. At the same time, tax evasion also has negative effects in the market economy, generating unfair competition. The study of tax evasion is of major relevance in determining the degree of economic, social and even cultural development of a country. The analysis of tax evasion aims at identifying the causes that lead to tax evasion, as well as identifying new solutions for higher voluntary compliance. The work is focused on the analysis of the causes and effects that will indicate the possible solutions to be applied in order to reduce the phenomenon of evasion tax. The results of the research show the impact of fiscal policies on the economy and the ways in which the reduction of tax evasion generates a considerable increase of the macroeconomic indicators that characterize the economy of a country.