India has formally notified the Principal Purpose Test (PPT) for its tax treaty with Mauritius, effective from August 10, 2026. This rule empowers tax authorities to deny treaty benefits if an investment structure is deemed primarily tax-motivated rather than commercially driven. While investments made before April 2017 remain protected, global funds and foreign investors now face increased scrutiny regarding the economic substance of their structures.
The Indian government has officially notified an amendment to the Double Taxation Avoidance Agreement (DTAA) with Mauritius, introducing the Principal Purpose Test (PPT). This change, notified on October 13, 2026, officially came into force on August 10, 2026. The move represents a significant shift in how tax authorities will assess cross-border investment structures involving Mauritius, a jurisdiction historically used by many foreign portfolio investors (FPIs), private equity (PE) firms, and venture capital (VC) funds to channel capital into India.
How the Principal Purpose Test Works
The PPT is a global standard used to prevent tax avoidance. Under this new rule, simply having a Tax Residency Certificate (TRC) or complying with basic documentation, such as Form 10F, may no longer be sufficient to claim tax treaty benefits. Revenue authorities are now empowered to look behind the formal structure of a company or entity.
If the tax department determines that obtaining a tax benefit was one of the principal purposes of an arrangement or transaction—and this benefit is not consistent with the overall objectives of the tax treaty—authorities can deny the relief. This effectively shifts the focus from 'form' to 'substance.' Investors are now expected to demonstrate that their Mauritius-based entities have a genuine commercial rationale and are not merely existing on paper to benefit from lower tax rates.
Impact on Foreign Investment Structures
For investors, this notification increases the regulatory burden and the level of uncertainty. Entities that rely heavily on complex, multi-jurisdictional structures specifically to optimize taxes may face higher scrutiny. If an arrangement is flagged as primarily tax-driven, it could result in higher tax demands, as the treaty benefits could be revoked.
It is important for investors to note that this rule contains a safeguard known as 'grandfathering.' Investments made before April 1, 2017, are exempt from the PPT, which provides significant relief for older, established funds. However, any new investments or restructurings occurring after this date must now align with the new, stricter standards. The burden of proof may now shift to the investor, who will likely need to provide detailed documentation proving the commercial necessity of their business structures to defend their tax position during an audit.
Moving Toward Global Standards
This amendment brings the India-Mauritius treaty in line with India’s broader efforts to curb base erosion and profit shifting, mirroring the stance taken under the domestic General Anti-Avoidance Rules (GAAR). By adopting the PPT, India is closing gaps that previously allowed for 'treaty shopping,' where investors would route funds through specific countries solely to take advantage of tax loopholes.
Investors, fund managers, and holding companies should monitor their current and planned investment structures. The key monitorable for the coming months will be how aggressively tax authorities apply this test in practice and what guidance is issued regarding acceptable commercial substance. Professionals often recommend that firms review their governance processes and clearly document the decision-making rationale behind their international holding structures to mitigate future risks.