India implements new tax scrutiny for investments via Mauritius

The Indian government has officially empowered tax authorities to reject treaty benefits on investments routed through Mauritius, marking a significant shift in the oversight of offshore capital structures. Under the newly implemented Principal Purpose Test (PPT), tax officials now possess the authority to deny relief if it is determined that securing such benefits was one of the primary reasons for initiating a transaction or arrangement. This regulatory update follows the notification of amendments to the India-Mauritius Double Taxation Avoidance Agreement (DTAA).The protocol, which was initially signed in March 2024, officially came into force on August 10, 2026. By incorporating the PPT at the treaty level, India has strengthened its defensive framework against aggressive tax planning. This development is expected to have far-reaching implications for a wide range of stakeholders, including foreign portfolio investors, private equity funds, multinational corporations, and various holding entities that have historically utilized Mauritius as a gateway for deploying capital into Indian markets.Official data provided by the Department for Promotion of Industry and Internal Trade (DPIIT) highlights the scale of the financial relationship between the two nations. Records indicate that Mauritius accounts for approximately $185.21 billion of India's cumulative foreign direct investment (FDI) equity inflows, which represents roughly 23.82% of total inflows recorded from April 2000 through December 2025. Given these figures, the introduction of the PPT is set to alter the landscape of how cross-border investment structures are assessed and how treaty claims are validated by the Indian tax authorities moving forward.The mechanics of the new test require tax authorities to evaluate all relevant facts and circumstances of a transaction before determining whether to grant or withhold treaty benefits. If, based on a comprehensive review, it is reasonable to conclude that obtaining tax relief was a principal purpose of the arrangement, the benefits may be denied. However, the protocol does allow for exceptions. Relief may still be granted if the tax authorities determine that providing such benefits remains consistent with the underlying object and purpose of the relevant treaty provisions.Industry experts suggest that this change serves as a critical anti-abuse measure. Richa Sawhney, a partner in the tax division at Grant Thornton Bharat, noted that the inclusion of the Principal Purpose Test provides an essential tool for regulators to ensure compliance. According to Sawhney, the introduction of this test will have a significant bearing on how future investment structures are designed and how firms justify their treaty claims when operating through this specific jurisdiction.The implementation of these rules follows a period of ongoing discussions regarding the transparency of offshore investment routes. As India continues to attract significant volumes of foreign capital, the government has increasingly focused on aligning its tax treaties with international standards to prevent treaty shopping and base erosion. The move reflects a broader trend of tightening oversight on capital inflows to ensure that tax benefits are claimed primarily by entities with genuine commercial substance rather than those seeking to exploit fiscal disparities between jurisdictions.Looking ahead, investors will likely need to conduct more rigorous due diligence to ensure that their offshore investment vehicles can withstand the heightened level of scrutiny. As the tax authorities begin to apply these new protocols, companies and financial institutions will be required to demonstrate the commercial necessity of their structures beyond the pursuit of tax efficiencies. This shift underscores the increasing complexity of cross-border financial compliance for entities investing in the Indian economy.