The aim of this work was a synthesis of theoretical and methodological provisions for developing ways to improve the regulatory function of taxes to increase the replenishment of the financial resources of Ukraine, taking into account estimates of the tax system of Ukraine, the Czech Republic and France and other European countries. Work became the basis of theoretical and methodological impact of the regulatory function of the tax on the formation of the financial resources of the state. Work describes the conditions of adopting new Tax Code of Ukraine in December 2010 and major changes in it. The efficacy of the tax system for the replenishment of financial resources of Ukrainian Budget is estimated. Reviewed ways of improving the regulatory function of taxes in Ukraine for more efficient filling of the budget of the state in modern conditions.