India and Mauritius have revised their long-standing tax treaty to tighten the rules governing cross-border tax relief, marking a significant shift in one of Asia's most closely watched bilateral tax arrangements. The amendment introduces a principal purpose test, or PPT, a widely used anti-avoidance standard that allows tax authorities to deny treaty benefits if one of the main purposes of a transaction or arrangement is to obtain those benefits in a manner inconsistent with the treaty's object and purpose.
The change is aimed squarely at treaty abuse, a long-running concern in India's tax policy architecture. For years, the India-Mauritius treaty has been central to foreign portfolio and direct investment flows into India, in part because of the tax treatment available to capital gains and other cross-border income. That role also made the treaty a focal point for scrutiny, especially where investors were perceived to route investments through Mauritius entities with limited commercial presence, raising questions over whether the structures reflected genuine business substance or primarily tax planning.
Treaty Tightening
The introduction of the PPT places greater emphasis on the purpose and commercial substance of transactions when authorities assess claims for treaty relief. In practical terms, this means that formal compliance with treaty residency or incorporation requirements may no longer be enough if the underlying arrangement appears to have been structured mainly to secure a tax advantage. The test is designed to give tax administrations a more flexible tool than older, narrower anti-abuse provisions, which often depended on proving specific sham or conduit arrangements.
For India, the amendment fits into a broader policy trend toward tougher scrutiny of cross-border tax structures and a more assertive approach to base erosion risks. The government has repeatedly signalled that it wants to preserve legitimate investment flows while closing loopholes that could be used to erode the domestic tax base. The revised treaty language reflects that balance: it does not eliminate treaty relief, but it raises the bar for taxpayers seeking to rely on it.
Mauritius, meanwhile, remains an important financial and investment jurisdiction with deep links to India. The treaty has historically supported capital movement between the two countries, and any tightening of its anti-abuse framework is likely to be watched closely by investors, fund managers and tax advisers. The key issue will be how the PPT is applied in practice, particularly in cases involving holding companies, investment vehicles and multi-jurisdiction structures that have legitimate commercial functions but also deliver tax efficiencies.
Investor Implications
The amendment is likely to increase the compliance burden for taxpayers claiming treaty benefits. Investors may need to document more clearly the business rationale for their structures, the location of decision-making, the presence of personnel and operations, and the commercial logic behind routing investments through Mauritius. In disputes, the burden of demonstrating substance and purpose could become more demanding, especially where the transaction profile suggests tax planning as a significant driver.
The move also has implications for certainty. While the treaty update is intended to curb abuse, anti-avoidance standards such as the PPT can sometimes create interpretive risk because they rely on judgment about purpose and substance. That may encourage more cautious structuring and, in some cases, greater use of alternative jurisdictions or direct investment routes where the tax position is clearer. At the same time, genuine long-term investors may welcome a framework that distinguishes more sharply between bona fide commercial arrangements and artificial structures.
The amendment comes at a time when global tax policy has been moving toward stronger anti-treaty-shopping measures, especially under the OECD's Base Erosion and Profit Shifting agenda. India has been among the more active adopters of such safeguards, and the Mauritius treaty revision aligns it more closely with international standards. For policymakers, the message is that treaty access is a privilege tied to real economic activity, not merely a formal legal address.
Broader Policy Shift
The revised treaty underscores a broader shift in India's fiscal strategy: preserving openness to foreign capital while tightening the rules that govern how that capital enters the country. That balance is increasingly central to India's tax diplomacy, particularly as the government seeks to attract long-term investment without allowing treaty networks to be used as conduits for aggressive tax minimisation.
For markets, the immediate effect is unlikely to be disruptive, but the longer-term impact will depend on enforcement and interpretation. If applied consistently and transparently, the PPT could reduce uncertainty around abusive structures while leaving room for legitimate investment. If applied unevenly, it could become another source of tax litigation. Either way, the amendment marks a clear signal that India and Mauritius are moving to a more substance-based treaty regime, with less tolerance for arrangements that exist mainly to harvest tax advantages.