Turkey imposed a controversial tax on wealth to finance the army in 1942. This tax was arbitrarily assessed and fell disproportionately on non-Muslim minorities. We study the heterogeneous impact of this tax on firms by assembling a new dataset of all enterprises in Istanbul between 1926 and 1950. We find that the tax led to the liquidation of non-Muslim-owned firms, which were older and more productive, reduced the formation of new businesses with non-Muslim owners, and replaced them with frailer Muslim-owned startups. The tax helped "nationalize" the Turkish economy, but had negative implications for productivity and growth.