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The impact of tax credits on labour supply

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  • Ghazala Azmat

Abstract

One of the principle aims of the Working Families' Tax Credit in the UK was to increase the participation of single mothers. The literature to date concludes there was approximately a five-percentage-point increase in employment of single mothers. The differences-in-differences methodology that is typically used compares single mother with single women without children. However, the characteristics of these groups are very different, and change over time in relative covariates are likely to violate the identifying assumption. We find that when we control for differential trends between women with and without children, the employment effect of the policy falls significantly. Moreover, the effect is borne solely by those working full-time (30 hours or more), while having no effect on inducing people into the labor market from inactivity. Looking closely at important covariates over time, we can see sizeable changes in the relative returns to employment between the treatment and control groups.

Suggested Citation

  • Ghazala Azmat, 2006. "The impact of tax credits on labour supply," Economics Working Papers 979, Department of Economics and Business, Universitat Pompeu Fabra, revised Jul 2009.
    • Handle: RePEc:upf:upfgen:979
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    References listed on IDEAS

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    1. Richard Blundell & Alan Duncan & Julian McCrae & Costas Meghir, 2000. "The labour market impact of the working families’ tax credit," Fiscal Studies, Institute for Fiscal Studies, vol. 21(1), pages 75-103, March.
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    3. Andrew Leigh, 2005. "Optimal Design of Earned Income Tax Credits: Evidence from a British Natural Experiment," CEPR Discussion Papers 488, Centre for Economic Policy Research, Research School of Economics, Australian National University.
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    5. Paul Gregg & Susan Harkness & Sarah Smith, 2009. "Welfare Reform and Lone Parents in the UK," Economic Journal, Royal Economic Society, vol. 119(535), pages 38-65, February.
    6. Mike Brewer & Tom Clark & Matthew Wakefield, 2002. "Five years of social security reforms in the UK," IFS Working Papers W02/12, Institute for Fiscal Studies.
    7. Duncan, Alan & Giles, Christopher, 1996. "Labour Supply Incentives and Recent Family Credit Reforms," Economic Journal, Royal Economic Society, vol. 106(434), pages 142-155, January.
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    More about this item

    Keywords

    Tax Credits; Differences-in-differences; Single Mothers.;
    All these keywords.

    JEL classification:

    • H24 - Public Economics - - Taxation, Subsidies, and Revenue - - - Personal Income and Other Nonbusiness Taxes and Subsidies
    • I38 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty - - - Government Programs; Provision and Effects of Welfare Programs
    • C14 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Semiparametric and Nonparametric Methods: General
    • J22 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Time Allocation and Labor Supply

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