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Understanding earnings quality - MIT Sloan School of Management

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5.6.3 Tax regulations<br />

Several studies exploit the LIFO conformity rule in the U.S. tax system to test whether<br />

incentives to minimize tax costs (i.e., present value <strong>of</strong> tax payments) affect accounting method<br />

choice, which in turn affects EQ. For example, Lee and Hsieh (1985), Hunt (1985), and Dopuch and<br />

Pincus (1988) document both tax (e.g., the magnitude <strong>of</strong> tax savings) and nontax explanations (e.g.,<br />

contracting costs) for the choice <strong>of</strong> inventory accounting methods. Keating and Zimmerman (1999)<br />

exploit a natural experiment due to a 1981 tax law change that mitigated the impact <strong>of</strong> tax<br />

considerations on financial reporting depreciation choices and find an increase in the frequency <strong>of</strong><br />

income-increasing depreciation estimate choices and a decrease in the frequency <strong>of</strong> income-<br />

increasing depreciation method changes after the 1981 tax law change. Guenther, Maydew, and<br />

Nutter (1997) exploit a change in book-tax conformity associated with the Tax Reform Act <strong>of</strong> 1986<br />

(TRA) and find that firms that are required to switch from the cash method to the accrual method<br />

have higher (lower) accruals than firms that already use the accrual method prior to (following) the<br />

rule change.<br />

Five papers in our database examine the effects <strong>of</strong> rate changes associated with the TRA and<br />

suggest that the rate change had a one-time impact on accruals choices around the period <strong>of</strong> the<br />

change. Scholes, Wilson, and Wolfson (1992), Guenther (1994), and Maydew (1997) conclude that<br />

firms shift income from the pre-TRA period to the lower tax-rate regime period by deferring revenue<br />

and accelerating expenses. The evidence on income shifting in the opposite direction to avoid the<br />

U.S. corporate alternative minimum tax (AMT), however, is inconsistent (Boynton, Dobbins, and<br />

Plesko, 1992; Choi, Gramlich, and Thomas, 2001).<br />

Two additional studies suggest that changes in tax incentives associated with the TRA led to<br />

a shift in accounting choices that will affect EQ on an on-going basis. The TRA increased the<br />

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