Labour supply in New Zealand and the 2010 tax and transfer changes

John Creedy and Penny Mok

New Zealand Economic Papers, 2017, vol. 51, issue 1, 60-78

Abstract: This paper examines the simulated labour supply responses to the personal tax and transfer policy changes introduced in New Zealand in 2010, and the implications for revenue and income distribution. The main changes examined are the increase in the Goods and Services Tax (GST) rate from 12.5% to 15%, along with reductions in personal income tax rates and increases in the main benefit payments and assistance to families with children, to compensate for the rise in the GST. The simulated labour supply responses were obtained using the Treasury's behavioural microsimulation model, TaxWell-B. The 2009/10 Household Economic Survey was used. The combined effect of all policy changes is to increase average labour supply slightly for all demographic groups, with a weighted average increase of 0.10 hours per person. The average hours increase is the largest for single parents, at 0.33 hours per person. Labour force participation of sole parents is simulated to increase by 0.86 percentage points. In considering separate components, the change in income tax rates is found to have the largest effect on labour supply. This is not surprising, given that it affected a large proportion of the population while the changes to the benefit system and assistance to families with children apply only to certain groups. The reforms are found to be approximately distribution neutral, in terms of the Gini inequality measure of after-tax income per adult equivalent person.

Date: 2017
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DOI: 10.1080/00779954.2015.1136675

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