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Microsimulation Analysis of Optimal Income Tax Reforms. An Application to New Zealand

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  • Creedy, John
  • Gemmell, Norman
  • Hérault, Nicolas
  • Mok, Penny

Abstract

This paper examines the optimal direction of marginal income tax reform in the context of New Zealand, which recently reduced its top marginal income tax rate to one of the lowest in the OECD. A behavioural microsimulation model is used, in which social welfare functions are defined in terms of either money metric utility or net income. The model allows for labour supply responses to tax changes, in which a high degree of population heterogeneity is represented along with all the details of the highly complex income tax and transfer system. The implications of the results for specific combinations of tax rate or threshold changes, that are both revenue neutral and welfare improving, are explored in detail, recognising the role of distributional value judgements in determining an optimal reform. The potential impact of additional income responses is also examined, using the concept of the elasticity of taxable income. Results suggest, under a wide range of parameter values and assumptions, that raising the highest income tax rate and/or threshold, would be part of an optimal reform package.

Suggested Citation

  • Creedy, John & Gemmell, Norman & Hérault, Nicolas & Mok, Penny, 2018. "Microsimulation Analysis of Optimal Income Tax Reforms. An Application to New Zealand," Working Paper Series 20834, Victoria University of Wellington, Chair in Public Finance.
    • Handle: RePEc:vuw:vuwcpf:20834
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    References listed on IDEAS

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    1. Thor O. Thoresen, 2004. "Reduced Tax Progressivity in Norway in the Nineties: The Effect from Tax Changes," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 11(4), pages 487-506, August.
    2. Banks, James & Johnson, Paul, 1994. "Equivalence Scale Relativities Revisited," Economic Journal, Royal Economic Society, vol. 104(425), pages 883-890, July.
    3. Blackorby, Charles & Laisney, Francois & Schmachtenberg, Rolf, 1993. "Reference-price-independent welfare prescriptions," Journal of Public Economics, Elsevier, vol. 50(1), pages 63-76, January.
    4. Henrik Jacobsen Kleven & Claus Thustrup Kreiner & Emmanuel Saez, 2009. "The Optimal Income Taxation of Couples," Econometrica, Econometric Society, vol. 77(2), pages 537-560, March.
    5. Thomas Piketty & Emmanuel Saez, 2013. "Optimal Taxation of Labor Income," PSE-Ecole d'économie de Paris (Postprint) halshs-00944881, HAL.
    6. Thomas Piketty & Emmanuel Saez & Stefanie Stantcheva, 2014. "Optimal Taxation of Top Labor Incomes: A Tale of Three Elasticities," American Economic Journal: Economic Policy, American Economic Association, vol. 6(1), pages 230-271, February.
    7. FLEURBAEY, Marc & MANIQUET, François, 1998. "Optimal income taxation: and ordinal approach," LIDAM Discussion Papers CORE 1998065, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
    8. Besley, Timothy & Coate, Stephen, 1992. "Workfare versus Welfare Incentive Arguments for Work Requirements in Poverty-Alleviation Programs," American Economic Review, American Economic Association, vol. 82(1), pages 249-261, March.
    9. Thoresen, Thor O. & Vattø, Trine E., 2015. "Validation of the discrete choice labor supply model by methods of the new tax responsiveness literature," Labour Economics, Elsevier, vol. 37(C), pages 38-53.
    10. John Creedy & Nicolas Hérault & Guyonne Kalb, 2011. "Measuring welfare changes in behavioural microsimulation modelling: Accounting for the random utility component," Journal of Applied Economics, Universidad del CEMA, vol. 14, pages 5-34, May.
    11. Joseph Mercante & Penny Mok, 2014. "Estimation of wage equations for New Zealand," Treasury Working Paper Series 14/09, New Zealand Treasury.
    12. Thomas Piketty & Emmanuel Saez, 2012. "Optimal Labor Income Taxation," NBER Working Papers 18521, National Bureau of Economic Research, Inc.
    13. Rolf Aaberge & Ugo Colombino, 2005. "Designing Optimal Taxes With a Microeconometric Model of Household Labour Supply," Public Economics 0510013, University Library of Munich, Germany.
    14. John K. Dagsvik & Zhiyang Jia & Tom Kornstad & Thor O. Thoresen, 2014. "Theoretical And Practical Arguments For Modeling Labor Supply As A Choice Among Latent Jobs," Journal of Economic Surveys, Wiley Blackwell, vol. 28(1), pages 134-151, February.
    15. André Decoster & Peter Haan, 2015. "Empirical welfare analysis with preference heterogeneity," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 22(2), pages 224-251, April.
    16. 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.
    17. John Creedy & Guyonne Kalb & Rosanna Scutella, 2006. "Income distribution in discrete hours behavioural microsimulation models: An illustration," The Journal of Economic Inequality, Springer;Society for the Study of Economic Inequality, vol. 4(1), pages 57-76, April.
    18. John Creedy & Norman Gemmell, 2013. "Measuring revenue responses to tax rate changes in multi-rate income tax systems: behavioural and structural factors," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 20(6), pages 974-991, December.
    19. Donaldson, David, 1992. "On The Aggregation Of Money Measures Of Well-Being In Applied Welfare Economics," Journal of Agricultural and Resource Economics, Western Agricultural Economics Association, vol. 17(1), pages 1-12, July.
    20. Peter Ericson & Lennart Flood, 2012. "A Microsimulation Approach to an Optimal Swedish Income Tax," International Journal of Microsimulation, International Microsimulation Association, vol. 2(5), pages 2-21.
    21. Bart Capéau & André Decoster & Gijs Dekkers, 2016. "Estimating and Simulating with a Random Utility Random Opportunity Model of Job Choice Presentation and Application to Belgium," International Journal of Microsimulation, International Microsimulation Association, vol. 9(2), pages 144-191.
    22. Joseph Mercante & Penny Mok, 2014. "Estimation of Labour Supply in New Zealand," Treasury Working Paper Series 14/08, New Zealand Treasury.
    23. Simon Carey & John Creedy & Norman Gemmell & Josh Teng, 2015. "Estimating the Elasticity of Taxable Income in New Zealand," The Economic Record, The Economic Society of Australia, vol. 91(292), pages 54-78, March.
    24. repec:hal:pseose:halshs-00944873 is not listed on IDEAS
    25. John Creedy & Guyonne Kalb, 2006. "Labour Supply and Microsimulation," Books, Edward Elgar Publishing, number 4236.
    26. Emmanuel Saez, 2001. "Using Elasticities to Derive Optimal Income Tax Rates," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 68(1), pages 205-229.
    27. John Creedy & Nicolas Hérault, 2012. "Welfare-improving income tax reforms: a microsimulation analysis," Oxford Economic Papers, Oxford University Press, vol. 64(1), pages 128-150, January.
    28. John Creedy, 2015. "The elasticity of taxable income, welfare changes and optimal tax rates," New Zealand Economic Papers, Taylor & Francis Journals, vol. 49(3), pages 227-248, August.
    29. Jenkins, Stephen P & Cowell, Frank A, 1994. "Parametric Equivalence Scales and Scale Relativities," Economic Journal, Royal Economic Society, vol. 104(425), pages 891-900, July.
    30. Yoram Amiel & John Creedy & Stan Hurn, 1999. "Measuring Attitudes Towards Inequality," Scandinavian Journal of Economics, Wiley Blackwell, vol. 101(1), pages 83-96, March.
    31. John Creedy & Guyonne Kalb, 2005. "Measuring Welfare Changes In Labour Supply Models," Manchester School, University of Manchester, vol. 73(6), pages 664-685, December.
    Full references (including those not matched with items on IDEAS)

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    More about this item

    Keywords

    Optimal taxation; Tax reform; Behavioural microsimulation; Money metric utility;
    All these keywords.

    JEL classification:

    • D63 - Microeconomics - - Welfare Economics - - - Equity, Justice, Inequality, and Other Normative Criteria and Measurement
    • H21 - Public Economics - - Taxation, Subsidies, and Revenue - - - Efficiency; Optimal Taxation
    • H31 - Public Economics - - Fiscal Policies and Behavior of Economic Agents - - - Household
    • I31 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty - - - General Welfare, Well-Being
    • J22 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Time Allocation and Labor Supply

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