by André Casajus[*] and Andreas Hoffmann
Estonia was the first European country to introduce a flat tax on income in 1994. Many others followed. For example, Hungary successfully introduced a flat tax in 2012. In the U.S., some of the States (e.g. Pennsylvania) have introduced a flat tax on income. As in Germany, however, the federal income tax in the U.S. is still progressive. We believe the case for the flat tax is strong. Presenting an axiomatic justification for the flat tax as a redistribution rule, this post suggests that you need to accept only a few basic properties to favor a flat tax for income redistribution.