Purpose The purpose of this paper is to investigate the relationship between corporate social responsibility (CSR) and earnings quality, as proxied by accrual earnings management, in Egyptian firms. This research is conducted in a bidirectional fashion using simultaneous equations and considers two theoretical perspectives. Design/methodology/approach The study employs CSR annual scores from the Egyptian environmental, social and governance index (S&P/ESG index) for the 100 highest scoring firms from 2007 to 2015. It utilizes three earnings quality measures, in addition to considering reverse causality and endogeneity. Findings The results indicate that CSR has a positive association with earnings quality only in the top CSR scoring firms (top 30 ranked firms according to the index). Engaging in CSR in such firms enhances the quality of their earnings. This suggests that firms with relatively lower CSR scores (bottom 70 ranked firms according to the index) may use CSR to “greenwash” weaker earnings. Research limitations/implications The findings suggest that researchers, analysts and policy makers should consider earnings quality when estimating the real value of a firm’s CSR score. In particular, the Egyptian S&P/ESG index committee could further develop the index by incorporating earnings quality measures. Originality/value The study contributes to the literature by exploring in-depth the causal relationship between CSR practices and accrual earnings management in an emerging market. The results provide a nuanced story of CSR practices, with accruals earnings management (earnings quality) acting as a mediator of CSR’s inherent value.