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On the Optimal Progressivity of the Income Tax Code

  • Conesa, Juan Carlos
  • Krueger, Dirk

This paper computes the optimal progressivity of the income tax code in a dynamic general equilibrium model with household heterogeneity in which uninsurable labour productivity risk gives rise to a nontrivial income and wealth distribution. A progressive tax system serves as a partial substitute for missing insurance markets and enhances an equal distribution of economic welfare. These beneficial effects of a progressive tax system have to be traded off against the efficiency loss arising from distorting endogenous labour supply and capital accumulation decisions. Using a utilitarian steady state social welfare criterion we find that the optimal US income tax is well approximated by a flat tax rate of 17.2% and a fixed deduction of about $9,400. The steady state welfare gains from a fundamental tax reform towards this tax system are equivalent to 1.7% higher consumption in each state of the world. An explicit computation of the transition path induced by a reform of the current towards the optimal tax system indicates that a majority of the population currently alive (roughly 62%) would experience welfare gains, suggesting that such fundamental income tax reform is not only desirable, but may also be politically feasible.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 5040.

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Date of creation: May 2005
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Handle: RePEc:cpr:ceprdp:5040
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  22. Juan C. Conesa & Dirk Krueger, 1999. "Social Security Reform with Heterogeneous Agents," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 2(4), pages 757-795, October.
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  27. Emmanuel Saez, 2002. "Optimal Progressive Capital Income Taxes in the Infinite Horizon Model," NBER Working Papers 9046, National Bureau of Economic Research, Inc.
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