India has formally notified the Principal Purpose Test (PPT) for the India-Mauritius tax treaty, effective retroactively from August 10, 2026. This regulation empowers tax authorities to deny tax benefits to entities that lack genuine commercial substance. Investors using Mauritius routes should review their corporate structures to ensure they meet the new standards against tax avoidance.
The Indian government has officially brought into force the Principal Purpose Test (PPT) within the India-Mauritius Double Taxation Avoidance Agreement (DTAA). The protocol was formally notified in the Gazette of India on October 13, 2026, with an effective date of August 10, 2026. This move aligns India's tax framework with global standards designed to prevent base erosion and profit shifting, which are practices used to artificially reduce tax liabilities.
The Principal Purpose Test acts as a new filter for claiming tax benefits. Under this rule, Indian tax authorities can deny treaty benefits—such as lower withholding taxes on dividends or interest—if they determine that obtaining such a benefit was one of the principal reasons for a transaction or business structure. The goal is to ensure that tax treaties are used by companies with actual economic activity, rather than entities created solely to route money and save on taxes, a practice often called treaty shopping.
Impact on Investment Structures
For investors, the most significant change is the increased burden of proof. Foreign investors, private equity firms, and venture capital funds that utilize Mauritius-based holding companies must now be prepared to demonstrate that their entities possess genuine commercial substance. This includes having an independent decision-making process and clear business objectives beyond just tax planning.
Entities that are essentially shell or conduit companies—lacking offices, employees, or operational activity—face the highest risk of being denied treaty benefits. If authorities conclude that a structure is designed primarily for fiscal arbitrage, the entity could lose its entitlement to lower tax rates on income streams like dividends and interest.
Grandfathering and Regulatory Uncertainty
It is important to note that the new rules do not apply to all historical investments. Investments in shares acquired before April 1, 2017, remain grandfathered, meaning they are protected from this specific PPT provision. This provides some relief to long-term investors who established their positions before the previous major updates to the treaty.
The risk for current market participants lies in the potential for increased litigation and regulatory uncertainty. Because the test relies on judging the 'principal purpose' of an arrangement, there may be instances where authorities and taxpayers disagree on what constitutes a legitimate business reason. This may lead to scrutiny of income streams that were previously treated with less caution.
Investors should closely monitor future guidance from the Central Board of Direct Taxes (CBDT). Clarifications from the regulator will be the primary indicator of how strictly this test will be applied in practice and what specific benchmarks will be used to define legitimate commercial substance. Until further circulars are issued, legal and tax advisory reviews of existing Mauritius-based structures remain the most critical step for those with significant exposure in the region.