The aim of the paper is to point out the tax system and activity of tax authorities at carrying out a control activity and as well as the activity of its bodies in order to eliminate tax evasions and tax frauds for a sustainable development of state economy. We pay attention to tax systems and deal with tax frauds. We assume that there is no correlation between the number of registered taxpayers and the total tax collection. We also assume that the majority of findings from the tax controls that were carried out will be on VAT whereas there is no correlation between the findings of VAT controls and the number of tax controls carried out. We refer to the importance to strengthen the battle against tax frauds and tax evasions in Slovakia and the aim is to point out the current tax collection and the overall tax administration in the Slovak Republic with the focus on value added tax (VAT). The final part consists of the proposals for the possibilities to combat against tax frauds and tax evasions more effectively.