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The Optimal Threshold for GST on Imported Goods

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Abstract

This paper examines the determination of the optimal threshold value for Goods and Services Tax (GST) for imported units arising from internet orders. The concept of an optimal threshold is wider than simply the maximisation of revenue net of administrative costs. At the optimal threshold, the marginal cost of funds from GST is equated to the ratio of the marginal value of public funds to their marginal social value, reflecting the value judgements of a decision maker. The marginal cost of funds allows both for compliance costs and the marginal excess burden arising from a small increase in the threshold. Illustrative numerical values are reported, showing the sensitivity to administrative costs, the demand elasticity and, importantly, value judgements.

Suggested Citation

  • John Creedy, 2016. "The Optimal Threshold for GST on Imported Goods," Treasury Working Paper Series 16/01, New Zealand Treasury.
    • Handle: RePEc:nzt:nztwps:16/01
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    File URL: https://treasury.govt.nz/sites/default/files/2016-03/twp16-01.pdf
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    1. (IFS), Institute for Fiscal Studies & Mirrlees, James (ed.), 2011. "Tax By Design: The Mirrlees Review," OUP Catalogue, Oxford University Press, number 9780199553747.
    2. 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.
    3. John Creedy, 1998. "Measuring Welfare Changes and Tax Burdens," Books, Edward Elgar Publishing, number 1579.
    4. Keen, Michael & Mintz, Jack, 2004. "The optimal threshold for a value-added tax," Journal of Public Economics, Elsevier, vol. 88(3-4), pages 559-576, March.
    5. John Creedy & Cath Sleeman, 2005. "Excise taxation in New Zealand," New Zealand Economic Papers, Taylor & Francis Journals, vol. 39(1), pages 1-35.
    6. Bev Dahlby, 2008. "The Marginal Cost of Public Funds: Theory and Applications," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262042509, December.
    7. 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.
    8. 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.
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    More about this item

    Keywords

    Goods and Services Tax; Marginal cost of Funds; de minimis;
    All these keywords.

    JEL classification:

    • H20 - Public Economics - - Taxation, Subsidies, and Revenue - - - General
    • H21 - Public Economics - - Taxation, Subsidies, and Revenue - - - Efficiency; Optimal Taxation

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