Property taxation is widely viewed as a promising source of revenue for developing countries, yet evidence on its economic effects remains limited. Using administrative data from corporate and employee tax returns in a staggered difference-in-differences design, this paper shows that a property tax increase in Kampala, Uganda significantly reduced rates of firm survival. Business rental expenses increased by 6.3 percent, and firms responded by reducing formal employment and wages, with wage informalization accounting for most of the decline in the formal wage bill. Higher-earning employees of ongoing firms bore disproportionate shares of the wage declines. Within government, there were vertical fiscal externalities: the tax increase reduced central government income tax revenues by 30 percent of the amount it contributed to local property tax collections. The estimates imply that property taxes have 53 percent marginal deadweight losses.