Browsing by Author "Hasseldine, John"

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Open Access
The Tax Gap: A Methodological Review
(Te Herenga Waka—Victoria University of Wellington, 2012) Gemmell, Norman; Hasseldine, John
The global economic crisis has highlighted the continuing problem of tax evasion. For tax agencies to respond, an important antecedent necessitates knowing the extent of the problem. This study is the first to comprehensively review recent research on the tax gap. Our primary contributions are two-fold. First we argue that the tax gap, as conventionally defined, is conceptually flawed because it fails to capture behavioral responses by taxpayers adequately. Our second contribution is to review methods for measuring the tax gap and compare empirical estimates. We suggest that many of the most trenchant criticisms of conventional tax gap measurement (and the ‘hidden economy’ measures that underlie them) leave only microdata-based measures of tax non-compliance as likely to deliver more reliable tax gap estimates. Even here, however, further work is required, on both conceptual and empirical aspects, before tax gaps suitable for policy analysis (e.g. implications for enforcement policy) are likely to be delivered.
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Taxpayers' Behavioural Responses and Measures of Tax Compliance 'Gaps': A Critique
(Te Herenga Waka—Victoria University of Wellington, 2013) Gemmell, Norman; Hasseldine, John
The work of Feldstein (1995, 1999) has stimulated substantial conceptual and empirical advances in economists’ approaches to analysing taxpayers’ behavioural responses to changes in tax rates. Meanwhile, a largely independent literature proposing and applying alternative measures of tax compliance has also developed in recent years, which has sought to provide tax agencies with tools to identify the extent of tax non-compliance as a first step to designing policies to improve compliance. In this context, measures of ‘tax gaps’ – the difference between actual tax collected and the potential tax collection under full compliance with the tax code – have become the primary measures of tax non-compliance via (legal) avoidance and/or (illegal) evasion. In this paper we argue that the tax gap as conventionally defined is conceptually flawed because it fails to capture behavioural responses by taxpayers. We show that, in the presence of such behavioural responses, tax gap measures both for indirect taxes (such as the ‘VAT-gap’) and direct (income) taxes exaggerate the degree of noncompliance. Further, where these conventional tax gap measures motivate reforms designed to increase the tax compliance rate, they will likely have a tax base reducing effect and hence generate a smaller increase in realised tax revenues than would be anticipated from the tax gap estimate.