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The marginal welfare cost of personal income taxation in New Zealand

Author

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  • John Creedy
  • Penny Mok

Abstract

This present paper reports estimates of welfare changes and the marginal welfare cost of income taxation for a wide range of income and demographic groups in New Zealand, in the context of a uniform increase in all marginal income tax rates. The results are obtained using enhancements to the NZ Treasury's behavioural microsimulation model, TaxWell-B, which uses discrete hours modelling to examine the labour supply responses of all individuals to an income tax change. Considerable variation is found in the marginal welfare costs for different groups, with an overall value of 12 cents per extra dollar raised. The paper also demonstrates the use of a money metric utility measure in a social welfare function evaluation. A smaller reduction in ‘social welfare’ is obtained compared with the use of net incomes.

Suggested Citation

  • John Creedy & Penny Mok, 2018. "The marginal welfare cost of personal income taxation in New Zealand," New Zealand Economic Papers, Taylor & Francis Journals, vol. 52(3), pages 323-338, September.
    • Handle: RePEc:taf:nzecpp:v:52:y:2018:i:3:p:323-338
    DOI: 10.1080/00779954.2017.1363274
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    Cited by:

    1. Creedy, John & Gemmell, Norman & Hérault, Nicolas & Mok, Penny, 2018. "Microsimulation Analysis of Optimal Income Tax Reforms. An Application to New Zealand," GLO Discussion Paper Series 213, Global Labor Organization (GLO).
    2. John Creedy & Norman Gemmell & Nicolas Hérault & Penny Mok, 2020. "A microsimulation analysis of marginal welfare-improving income tax reforms for New Zealand," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 27(2), pages 409-434, April.
    3. Creedy, John & Gemmell, Norman & Hérault, Nicolas & Mok, Penny, 2018. "Microsimulation Analysis of Optimal Income Tax Reforms. An Application to New Zealand," GLO Discussion Paper Series 213, Global Labor Organization (GLO).

    More about this item

    JEL classification:

    • H20 - Public Economics - - Taxation, Subsidies, and Revenue - - - General
    • H31 - Public Economics - - Fiscal Policies and Behavior of Economic Agents - - - Household
    • I30 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty - - - General
    • D63 - Microeconomics - - Welfare Economics - - - Equity, Justice, Inequality, and Other Normative Criteria and Measurement

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