Optimal Capital Taxation for Time-Nonseparable Preferences

This paper studies the effect of habit formation on optimal capital taxes in a dynamic Mirrleesian model. We make three distinct contributions. First, we decompose intertemporal wedges (implicit capital taxes) for general time-nonseparable preferences into a wealth effect, a complementarity effect, and a future incentive effect. Second, we provide conditions under which intertemporal wedges are positive. Third, we derive a recursive formulation of constrained efficient allocations and evaluate the quantitative impact of habit formation. In a model parameterized to the U.S. economy, habit formation reduces average intertemporal wedges by about 40 percent compared to the time-separable case. Moreover, intertemporal wedges are close to zero for the largest part of the working life