Flat Tax, the solution?

This article presents a comparative study of the tax burden of the Portuguese tax system, with the application of progressive rates and proportional rates (flat tax) in determining personal income tax. For this work we chose case study methodology, specifically comparative case study methodology, because it is understood to be the one best suited to the complexity of the subject under review. The results demonstrate that flat tax respects the constitutional principle of progressive tax rates; Portuguese taxpayers with lower (higher) incomes pay less (more) taxes on personal income compared to the flat tax; that the existence of progressive rates does not mean Portuguese taxpayers benefit; and that the flat tax can achieve higher tax revenue than the IRS (Individual Income Tax) in force. Although adoption of the flat tax is possible, it is not believed this adoption would be feasible for political reasons.