Abstract
This paper examines the effect of tax planning and earnings management on the relative informativeness of book income and taxable income. We conduct two sets of tests documenting (1) the incremental effect of tax planning and earnings management on the relative informativeness of book and taxable income and (2) the relation between voluntary conformity and the relative informativeness of book and taxable income. Based on these two sets of tests, we conclude that tax planning and earnings quality jointly affect the relative informativeness of book and taxable income