Abstract: The mechanisms and ways to defraud the value added tax (VAT) in Poland have been discussed. Nowadays the value added tax defraudation mechanisms have become a very widespread phenomenon in Poland which threaten the functioning of both the Polish national economy and the country as a whole. Based on the survey some particular mechanisms of VAT extortion, have been studied, namely the "VAT carousel", fictitious exports, undercutting sales and fictitious costs. The survey was conducted amongst persons who are aware of the value added tax problem and who potentially could encounter such illegal practices in their professional activity. The respondents can be divided into three groups: people who work in accounting, pri...