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This article is a first attempt to provide a quantitative evaluation of the welfare gains resulting from the introduction of flat income taxation in Bulgaria in 2008. Using a calibrated microfounded endogenous growth model with physical and human capital accumulation and Bulgarian data, a computational experiment is performed to quantify the dynamic welfare effect of progressive income taxation vis-à-vis flat income taxation. The model demonstrates that significant welfare gains, measured in terms of per-period consumption, can be realized with the introduction of flat income taxation. In addition, these welfare gains increase proportionally with the length of the time horizon considered. Finally, sensitivity analysis was performed to demonstrate that the results obtained are robust. [ABSTRACT FROM PUBLISHER]