Pareto-Improving Optimal Capital and Labor Taxes

We study optimal fiscal policy in a model with agents who are heterogeneous in their labor productivity and wealth, and there is an upper bound on the capital tax rate each period. We focus on Pareto-improving plans. We show that the optimal tax reform is to cut labor taxes and leave capital taxes high in the short and medium run. Only in the very long run would capital taxes be zero. For our calibration labor taxes should be low for the first eleven to twenty-six years, while capital taxes should be at their maximum. This policy ensures that all agents benefit from the tax reform and that capital grows quickly after the reform. Therefore, the long-run optimal tax mix is the opposite of the short- and medium-run one. The initial labor tax cut is financed by deficits, which lead to a positive level of government debt in the long run, reversing the standard prediction that the government accumulates savings in models with optimal capital taxes. The welfare benefits from the tax reform are high and can be shifted entirely to capitalists or workers by varying the length of the transition.