The high share of self-employed person in employment, coupled with the low income tax receipts of these entities, are the main current issues that fiscal policy of the Czech republic should actively solve. However, the presence of the shadow economy in the form of a seeming business or curtailment of tax liability is a significant problem. Relatively low taxing self-employed workers in comparison with employees, along with the existence of seeming business, puts many self-employed into the role of cheap labour. The amount of income tax collected from the self-employed in the years 2011 to 2016 oscillated around 0.9 to 4.6% of the amount of income tax collected from employees. The aim of this thesis is therefore to introduce the business tax as one of the possibilities to bring a part of the self-employed from the shadow economy to contribute to the stabilization of the current state.