Does Book-Tax Conformity Deter Opportunistic Book and Tax Reporting? An International Analysis

This paper examines whether book-tax conformity (i.e. reducing the gap between financial and taxable incomes) can restrain managers from opportunistically reporting financial profits and taxable income. Empirical work on this relation so far is limited and provides contradictory results. Using publicly available financial statements from 1994 to 2007 for 16,739 firms across 32 countries, I construct a new proxy for mandatory conformity and document that high book-tax conformity is associated with lower levels of earnings management and tax avoidance. These results persist even after controlling for firm characteristics and institutional factors, such as legal enforcement, investor protection, legal systems, capital market development, and the adoption of International Financial Reporting Standards (IFRS). Additional tests reveal that the deterrent effect of conformity on earnings management is more pronounced in code-law countries but does not differ between IFRS and non-IFRS adopters, and between developed and developing capital markets.