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Title: Optimal Income Taxation: Mirrlees Meets Ramsey

Author(s): Jonathan Heathcote and Hitoshi Tsujiyama

Publication Date: February 2015

Keyword(s): flat tax, Mirrlees taxation, optimal income taxation, private insurance, Ramsey taxation, social welfare functions and tax progressivity

Programme Area(s): International Macroeconomics and Public Economics

Abstract: What structure of income taxation maximizes the social benefits of redistribution while minimizing the social harm associated with distorting the allocation of labor input? Many authors have advocated scrapping the current tax system, which redistributes primarily via marginal tax rates that rise with income, and replacing it with a flat tax system, in which marginal tax rates are constant and redistribution is achieved via non-means-tested transfers. In this paper we compare alternative tax systems in an environment with distinct roles for public and private insurance. We evaluate alternative policies using a social welfare function designed to capture the taste for redistribution reflected in the current tax system. In our preferred specification, moving to the optimal flat tax policy reduces welfare, whereas moving to the optimal fully nonlinear Mirrlees policy generates only tiny welfare gains. These findings suggest that proposals for dramatic tax reform should be viewed with caution.

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Bibliographic Reference

Heathcote, J and Tsujiyama, H. 2015. 'Optimal Income Taxation: Mirrlees Meets Ramsey'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=10380