Using a household budget survey for 1992, Hassan-the number of rates and brackets increased from 7 to 10, shows the poor revenue performance and distribuLional and the levels of exemption remain unchanged. impact of BuLgaria's personal income tax system. He (Complex, higher rates complicate administration and explores the implications for revenue and income enforcement and provide inicentives for tax evasion. And distribution of two alternative tax systensa flat. tax in the alternative systems Hassan explores, the poor are and a progressive but simpler three-brackets tax system.protected with higher exemnptions.) He demonstrates that simpler tax structures with lower Fortunately, the country's personal income tax tax rates could achieve at least equal revenue and structure began to move toward less nominal distributional objectives and are superior in terms of progressivity after Bulgaria's 1997 tax reform program. efficiency anid equity. (The findings are robust whenThe tax rate in the top income bracket was reduced from Bulgaria's significant tax evasion is included.) 52 percent to 40 percent, the number of tax brackets was But tax changes since 1992 have, if anything, moved halved, and the exemption level was increased 20 Bulgaria even further from a simple income tax system: percent (reducing tax burdens on the poor).This papera product of the Poverty Reduction and Economic Management Sector, Europe and Central Asia Regionis part of a larger effort in the region to analyze the social and revenue dimensions of tax reforms in transition economies.Copies of the paper are available free from the World Bank,