Resumen
Personal income tax is one of the most important tax forms in the tax systems of modern countries, very generous and flexible. Personal income taxation can be organized as regular, synthetic or mixed taxing. In modern tax legislation there are alternative ways of personal income taxing, such as the double taxation system, proportional tax on income and negative income tax. Fiscal reforms performed in Serbia were often delayed due to numerous, sometimes non-economic reasons. The seriousness and necessity of a dynamic approach to the process of the tax system reforms in our country is still topical. In this respect, the aim of this paper is to highlight the advantages and disadvantages of the double tax system, as well as to point out the need to reform the personal income taxation in Serbia.