Marginal Tax Rates and Income: New Time Series Evidence∗

This paper estimates the dynamic effects of marginal tax rate changes on income reported on tax returns in the United States over the 1950-2010 period. After isolating exogenous variation in average marginal tax rates in structural vector autoregressions using a narrative identification approach, I find large positive effects in the top 1% of the income distribution. In contrast to earlier findings based on tax return data, I also find large effects in other income percentile brackets. A hypothetical tax reform cutting marginal rates only for the top 1% leads to sizeable increases in top 1% incomes and has a positive effect on real GDP. There are also spillover effects to incomes outside of the top 1%, but top marginal rate cuts lead to greater inequality in pre-tax incomes.