The Divergence between Book Income and Tax Income

Mihir A. Desai

203 citations0/0 files storedTax Policy and the Economy

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Corporate Taxation and Avoidance Taxation and Legal Issues Auditing, Earnings Management, Governance

Abstract

This paper examines the evolution of the corporate profit base and the relationship between book income and tax income for U.S. corporations over the last two decades. The paper demonstrates that this relationship has broken down over the 1990s, and it has broken down in a manner consistent with increased tax-sheltering activity. The paper traces the growing discrepancy between book income and tax income associated with differential treatments of depreciation, the reporting of foreign source income, and in particular the changing nature of employee compensation. For the largest public companies, proceeds from option exercises equaled 27 percent of operating cash flow from 1996 to 2000. These deductions appear to be fully utilized, thereby creating the largest distinction between book income and tax income. While the differential treatment of these items has historically accounted fully for the discrepancy between book income and tax income, this paper demonstrates that book and tax income have diverged markedly for reasons not associated with these items during the late 1990s. In 1998, more than half the difference between tax and book income--approximately $154.4 billion, or 33.7 percent of tax income--cannot be accounted for by these factors. This paper proceeds to develop and test a model of costly tax sheltering and demonstrates that the breakdown in the relationship between tax income and book income is consistent with increasing levels of sheltering during the late 1990s. These tests also explore an alternative explanation of these results--coincident increased levels of earnings management--and find that the nature of the breakdown between book and tax income cannot be explained fully by this alternative explanation.

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References

1991Earnings Management During Import Relief Investigations 2000Earnings Management: Reconciling the Views of Accounting Academics, Practitioners, and Regulators 1988An Explanation for Accounting Income Smoothing 1983Taxes and firm size 2001The Relation between Financial and Tax Reporting Measures of Income 1996Employee stock option exercises an empirical analysis

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