Tax havens, evasion and media influence the grey economy, which includes both tax havens and tax evasions, is a major problem for developed countries, as it is difficult to find the right solutions to reduce it. Not long ago, this area of grey economy was identified as a national problem that each country had to face individually. However, with the advent of globalization, the issue has taken on new dimensions, so it is very important today that we collectively approach to search for a solution in cooperation with other countries. In the research, I have elaborated the given problem in more detail. I have identified who the tax evasion players are, how harmful tax havens are to developed countries, how such acts are punished and highlighted the biggest tax schemes that we are aware of. Based on the acquired theory I built a case study on an example of the Republic of Slovenia. I analyzed relevant tax legislation, identified the areas where we made the most changes, and summarized all the findings in the very conclusion.