In 2013, the Companies Act in India mandated that foreign subsidiaries with specified profitability and size spend at least 2% of their net income on corporate social responsibility (CSR). The study uses this natural experiment to isolate the impact of CSR spending on multinational enterprise (MNE) subsidiary performance. Using a triple difference estimation method on 175 foreign subsidiaries from 2005 to 2020, this study finds a positive impact of the compulsory CSR regulation on the CSR spender subsidiaries. We also find that higher institutional distance and greater subsidiary age benefit affected subsidiaries, positively impacting their performance because of mandatory CSR spending. The findings offer suitable recommendations for managers and policymakers in emerging markets as navigating regulatory CSR policies in the host country requires considering both resource-based and institutional environment factors.