In this paper we study the quantitative impact of marginal tax rates on the distribution of income. Our methodology builds on computable general-equilibrium framework. We find that distortions from marginal tax rate changes of the sort implied by the Tax Reform Act of 1986 have sizable effects on income inequality in a reasonably quantified life-cycle setting: In our model rate changes alone capture half the increase in the pretax Gini that actually occurred between 1984 and 1989.