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Optimal Taxation of Normal and Excess Returns to Risky Assets

Author

Listed:
  • Robin Boadway

    (Department of Economics, Queen's University)

  • Kevin Spiritus

    (Department of Economics, Erasmus University Rotterdam)

Abstract
We study the optimal taxation of risk-free and excess capital income with heterogeneous rates of return, alongside an optimal nonlinear earnings tax. Households can hold three assets: one risk-free, one risky but diversifiable, and one a private investment with idiosyncratic risk whose expected return differs among households. Contrary to expectations, the optimal tax on excess returns to risky assets is ineffective for redistribution, because its effects are annulled by a Domar-Musgrave effect. It assumes only an insurance role, and is positive. The optimal tax on risk-free returns does fulfill a redistributive role, insofar the risk-free returns reveal information about the investors' types beyond what is revealed by the earnings tax base. The optimal nonlinear earnings tax takes the standard Mirrleesian form amended to take account of the stochasticity of capital income tax revenue.

Suggested Citation

  • Robin Boadway & Kevin Spiritus, 2021. "Optimal Taxation of Normal and Excess Returns to Risky Assets," Tinbergen Institute Discussion Papers 21-025/VI, Tinbergen Institute.
    • Handle: RePEc:tin:wpaper:20210025
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    File URL: https://papers.tinbergen.nl/21025.pdf
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    References listed on IDEAS

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    More about this item

    Keywords

    optimal capital taxation; Rate-of-Return Allowance; risk; excess returns;
    All these keywords.

    JEL classification:

    • H21 - Public Economics - - Taxation, Subsidies, and Revenue - - - Efficiency; Optimal Taxation
    • H23 - Public Economics - - Taxation, Subsidies, and Revenue - - - Externalities; Redistributive Effects; Environmental Taxes and Subsidies
    • H24 - Public Economics - - Taxation, Subsidies, and Revenue - - - Personal Income and Other Nonbusiness Taxes and Subsidies

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