Book-Tax Differences and Inland Revenue Audit Adjustments in New Zealand

Abstract:  Using confidential data from US manufacturing firms' tax returns and Inland Revenue Service (IRS) audit adjustments, Mills (1998) tests, and finds support for, her hypothesis that IRS audit adjustments increase as the book-tax differences increase. We test Mills' hypothesis using confidential data obtained from the New Zealand Inland Revenue (hereafter Inland Revenue). Confidential data provide the key variable of interest, Inland Revenue's proposed audit adjustment, which is not available from public sources. These data provide the exact audit adjustment amounts, eliminating measurement errors inherent in proxy variables, and enable a temporal alignment of the book-tax differences with the Inland Revenue audit adjustments, thereby enhancing the internal validity of the relation between book-tax differences and Inland Revenue audit adjustments. Because the results of our study using New Zealand data, another time period, a more diverse set of firms, and a different institutional environment are consistent with those of Mills, we argue for the generalizability of Mills' hypothesis that proposed audit adjustments are positively related to the excess of book income over taxable income.     

Voluntary disclosure of operating income

This study investigates whether New Zealand firms’ voluntary disclosure of operating income, which is also known as earnings before interest and tax, in the income statement is related to the investment opportunity set. New Zealand provides an ideal setting to examine this because New Zealand generally accepted accounting principles do not require the disclosure of operating income as an intermediate income number in arriving at net income (earnings) in the income statement. We hypothesize and find evidence that firms with high assets‐in‐place and high leverage are more likely to voluntarily disclose operating income/earnings before interest and tax. However, the assets‐in‐place finding is sensitive to alternative measures of the investment opportunity set.     

Efficient contracting and accounting

This paper examines the role of accounting in an efficient contracting perspective of the firm. The firm is an alternative to the market when the costs of using the market become excessive. When a firm replaces the market, authority substitutes for the price mechanism in determining how decisions are made. This paper examines accounting's role in controlling the firm to ensure resources are put to their highest-value use. Accounting, together with employment contracts, compensation arrangements, debt contracts, internal and external auditors, and the board of directors including its audit and compensation committees comprise a package of mechanisms that have evolved to govern the firm. These institutional devices become the firm's efficient contracting technology. As accounting is part of that contracting technology, the accounting controls and systems that evolve and get implemented are efficient and the accounting methods that are used in calculating the numbers that form part of the firm's contractual arrangements are, likewise, efficient.     

Comprehensive versus partial deferred tax liabilities and equity market values

This study investigates the value relevance of the deferred tax liability recognized using comprehensive versus partial allocation. Our research examines New Zealand firms who, prior to the introduction of International Financial Reporting Standards, were free to choose between comprehensive and partial allocation. We test the joint hypothesis that the partial, as opposed to comprehensive, deferred tax liability is relevant for equity valuation and is sufficiently reliable to be reflected in investors’ valuation assessments. Our results are consistent with this prediction.