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Structure of the optimal income tax in the quasi‐linear model

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  • Nigar Hashimzade
  • Gareth D. Myles

Abstract

Existing numerical characterizations of the optimal income tax have been based on a limited number of model specifications. As a result, they do not reveal which properties are general. We determine the optimal tax in the quasi‐linear model under weaker assumptions than have previously been used; in particular, we remove the assumption of a lower bound on the utility of zero consumption and the need to permit negative labor incomes. A Monte Carlo analysis is then conducted in which economies are selected at random and the optimal tax function constructed. The results show that in a significant proportion of economies the marginal tax rate rises at low skills and falls at high. The average tax rate is equally likely to rise or fall with skill at low skill levels, rises in the majority of cases in the centre of the skill range, and falls at high skills. These results are consistent across all the specifications we test. We then extend the analysis to show that these results also hold for Cobb‐Douglas utility.

Suggested Citation

  • Nigar Hashimzade & Gareth D. Myles, 2007. "Structure of the optimal income tax in the quasi‐linear model," International Journal of Economic Theory, The International Society for Economic Theory, vol. 3(1), pages 5-33, March.
    • Handle: RePEc:bla:ijethy:v:3:y:2007:i:1:p:5-33
    DOI: 10.1111/j.1742-7363.2007.00044.x
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    Cited by:

    1. John Creedy, 2010. "Personal Income Tax Structure: Theory and Policy," Chapters, in: Iris Claus & Norman Gemmell & Michelle Harding & David White (ed.), Tax Reform in Open Economies, chapter 7, Edward Elgar Publishing.
    2. John Creedy & Nicolas Hérault, 2009. "Optimal Marginal Income Tax Reforms: A Microsimulation Analysis," Melbourne Institute Working Paper Series wp2009n23, Melbourne Institute of Applied Economic and Social Research, The University of Melbourne.

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