Our research aims to analyze the evolution in time and space of taxation rates and the impact of legislative changes on the microeconomic and macroeconomic environments, as well as the impact of legislative changes, the analysis of different models of tax systems based on the flat tax rate, used in Romania, or progressive tax rates, preferred in countries like France, Belgium and Luxembourg. Attempts at comparing personal income taxes are relatively rare and difficult to achieve precisely because of the tax legislation that is significantly different from one country to another in terms of tax base, tax rates or method of calculation of the various taxes and fees. Identifying the best taxation approach is the main goal of our paper. O...