This research aims to provide empirical evidence on the tax avoidance behavior of firms that engage in corporate social responsibility (CSR) activities. Based on a sample of 41 Egyptian non-financial companies listed in the Egyptian Stock Exchange (EGX100) during the period from 2016 to 2021, the research employs both generalized least squares (GLS) and panel-corrected standard errors (PCSE) regression analyses to examine the relationship between CSR and tax avoidance. The empirical results show that there is a significant inverted U-shaped relationship between CSR and tax avoidance, as measured by current ETR and GAAP ETR. This finding suggests that tax avoidance practices decrease with an increase in CSR performance. However, when the CSR index exceeds a certain threshold, tax avoidance practices increase as CSR performance increases.