Increasing the conformity between accounting earnings and taxable income has been proposed to improve financial reporting and curtail aggressive tax planning. We find, however, that increasing conformity results in earnings that are less informative. Our inquiry exploits a unique sample of firms forced to change from the cash method to the accrual method for tax purposes, thereby increasing their book-tax conformity. We find that these firms experienced a decrease in earnings informativeness compared to control firms unaffected by the change. To our knowledge, this is the first evidence of tax law changes affecting the informativeness of accounting earnings.

We develop and describe a new measure of long-run corporate tax avoidance that is based on the ability to pay a low amount of cash taxes per dollar of pre-tax earnings over long time periods. We label this measure the “long-run cash effective tax rate.” We use the long-run cash effective tax rate to examine (1) the extent to which some firms are able to avoid taxes over periods as long as ten years, and (2) how predictive one-year tax rates are for long-run tax avoidance. In our sample of 2,077 firms, we find there is considerable cross-sectional variation in tax avoidance. For example, approximately one-fourth of our sample firms are able to maintain long-run cash effective tax rates below 20 percent, compared to a sample mean tax rate of approximately 30 percent. We also find that annual cash effective tax rates are not very good predictors of long-run cash effective tax rates and, thus, are not accurate proxies for long-run tax avoidance. While there is some evidence of persistence in annual cash effective tax rates, the persistence is asymmetric. Low annual cash effective tax rates are more persistent than are high annual cash effective tax rates. An initial examination of characteristics of firms successful at keeping their cash effective tax rates low over long periods shows that they are well spread across industries but with some clustering.

ABSTRACT This paper demonstrates that the equilibrium impact of capital gains taxes reflects both the capitalization effect (i.e., capital gains taxes decrease demand) and the lock‐in effect (i.e., capital gains taxes decrease supply). Depending on time periods and stock characteristics, either effect may dominate. Using the Taxpayer Relief Act of 1997 as our event, we find evidence supporting a dominant capitalization effect in the week following news that sharply increased the probability of a reduction in the capital gains tax rate and a dominant lock‐in effect in the week after the rate reduction became effective.