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16 Austl. Tax F. 3 (2001)

handle is hein.journals/austraxrum16 and id is 1 raw text is: 










The Influence of Income Taxes on


the Use of Debt Held by Publicly


Listed Australian Corporations*


Grant Richardson and Roman Lanis**





It has been contended that under a classical tax system, income tax encourages firms
to employ debt in their capital structures due to interest expenditure being tax
deductible. Moreover, as total deductible expenditure is limited to income in any given
year, the value of debt tax shields may be affected by the level of non-debt
expenditure that is deductible. Consequently, debt usage may be positively related to
corporate tax rates after controlling for non-debt tax shields and non-debt
determinants of debt utilization. Our study extends the Australian literature by
empirically testing simultaneously, the tax hypothesis and the tax substitution
hypothesis for a sample of Australian firms operating under a dividend imputation
system. We estimate regression models of the level of interest expense on proxies for
expected future tax rates, interactions between the tax rate proxies and non-debt tax
shields and other determinants of debt utilization after controlling for the effect of



*   This study was supported by a research grant fioin the Faculty of Business &
    Econonmics at Monash University, Clayton, Australia. The authors wish to thank
    Rob Brown, Graham Peirson, Tim Brailsford, Peter Howard, Richard Vann, an
    anonymous referee and participants at both the 1999 European Accounting
    Association Conference in Bordeaux, France and the 1999 Asia-Pacific Finance
    Association Conference in Melbourne, Australia for their helpful comments in the
    preparation of this article.
** Grant Richardson is a Senior Lecturer in the Department of Accounting & Finance,
    and the Department of Business Law & Taxation at Monash University in Clayton
    Victoria.
    Roman Lanis is a Lecturer in the Department of Accounting & Finance at The
    University of Newcastle, Ourimbah NSW

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