Book-tax differences: are they affected by equity-based compensation?

Purpose – This study aims to investigate the moderating effect of equity-based compensation on the sources of book-tax differences. The authors investigate whether equity-based compensation affects the association between book-tax differences and tax planning, and the association between book-tax differences and earnings management. Design/methodology/approach – The authors use a sample of 9,024 firm-year observations (913 firms) spanning the period 1992-2011, obtained from ExecuComp and Compustat. They estimate cross-sectional regressions of the proxy for tax planning, discretionary accruals and their interactions with equity-based compensation on book-tax differences. Findings – The authors find that tax planning-related book-tax differences increase as the equity-based pay of executives does, and that earnings management-related book-tax differences decrease as the equity-based pay of executives increases. The results are robust across three alternative measures of tax planning. Originality/value – Equity-based compensation plays an important role in managerial discretion on tax planning and earnings management. The findings suggest that, although equity incentives promote a high level of both tax planning and earnings management, they motivate managers to constrain the level of earnings management to avoid larger book-tax differences.