India-Mauritius Tax Treaty Amendment 2026: PPT Impact Guide

India and Mauritius have fundamentally reshaped their tax treaty relationship with the introduction of the Principal Purpose Test (PPT), marking a significant shift in how cross-border investments will be scrutinized. For decades, Mauritius served as the preferred route for foreign investments into India, with billions of dollars flowing through this channel. However, the amended treaty notified on October 13, 2026, signals a new era of stringent compliance and substance-based taxation that every foreign investor must understand.

Whether you're a Foreign Portfolio Investor (FPI), private equity fund, venture capital investor, or corporate treasury manager, this amendment directly impacts your investment structures, tax planning strategies, and compliance obligations. The PPT isn't just another regulatory checkbox—it fundamentally changes how tax authorities evaluate the legitimacy of Mauritius-routed investments.

Understanding the India-Mauritius Tax Treaty Amendment 2026

The protocol to amend the existing India-Mauritius Double Taxation Avoidance Agreement (DTAA) was signed on March 7, 2024, in Port Louis, but the implementation timeline extended over several months as both countries completed their domestic legal procedures.

Timeline of the Amendment

The amended India-Mauritius DTAA came into force on August 10, 2026, after both countries completed the required formalities. The Central Board of Direct Taxes (CBDT) notified the protocol amending the India-Mauritius DTAA on October 13, 2026 under Section 159(1) of the Income-tax Act, 1961.

Key Changes Introduced

The amendment replaces the treaty preamble to state that the pact intends to eliminate double taxation without creating opportunities for non-taxation or reduced taxation through tax evasion or avoidance, including treaty-shopping arrangements designed to obtain treaty relief indirectly for residents of third jurisdictions.

The two primary changes are:

• Modified Preamble: Explicitly clarifies the treaty's anti-abuse intent
• Principal Purpose Test (PPT): A comprehensive anti-treaty shopping provision aligned with OECD BEPS standards

What is the Principal Purpose Test (PPT)?

The Principal Purpose Test represents a fundamental shift from form-based to substance-based treaty entitlement assessment. According to the notification, treaty benefits will not be granted if, based on the relevant facts and circumstances, it is reasonable to conclude that obtaining the benefit was one of the principal purposes of an arrangement or transaction, unless granting the benefit is consistent with the objectives of the relevant treaty provisions.

How PPT Operates in Practice

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, and 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.

The Substance Over Form Approach

Vishwas Panjiar, Managing Partner at SVAS Business Advisors LLP, noted that for investors, the commercial rationale, decision-making and actual circumstances of the structure may be relevant alongside formal residence and documentation. However, the PPT does not make every investment routed through Mauritius, or every arrangement that obtains a tax advantage, automatically abusive.

Tax authorities will examine factors including:

• Operational offices and employees in Mauritius
• Decision-making authority and board meetings location
• Commercial purpose beyond tax savings
• Economic substance and genuine business activity
• Investment rationale and documentation trail

Impact on Foreign Portfolio Investors (FPIs)

The Mauritius route has historically been significant for foreign portfolio investments. Over 600 FPIs from Mauritius manage roughly ₹50 billion in assets under custody (AUC) in India, translating to approximately 6% of the total FPI AUC in the country.

Increased Scrutiny for Mauritius-Based FPIs

The income-tax (I-T) department has intensified its scrutiny of foreign portfolio investors (FPIs) in Mauritius who are claiming tax benefits under the India-Mauritius treaty, with over half a dozen Mauritius-based FPIs receiving notices from the I-T department in recent weeks regarding their Tax Residency Certificates (TRCs).

What FPIs Must Demonstrate

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.

FPIs must now establish:

1. Economic Substance: Real offices, infrastructure, and operational presence in Mauritius
2. Decision-Making: Key investment decisions made by personnel based in Mauritius
3. Commercial Purpose: Business rationale independent of tax benefits
4. Compliance History: Consistent filing of Mauritian tax returns and regulatory compliance

If you're managing investments through Mauritius entities, use the Capital Gain Calculator to understand your potential tax liability under different scenarios.

Grandfathering Protection for Pre-2017 Investments

One of the most critical clarifications for long-term investors relates to the grandfathering provision. Investments made prior to April 1, 2017, would remain outside the scope of the PPT.

CBDT Circular on Grandfathering

The Central Board of Direct Taxes (CBDT) on January 21, 2025, issued a circular (Circular No. 1/2025) clarifying that grandfathering provisions in the treaties are excluded from the scope of the PPT provision. This provides significant relief to investors who established positions before the 2016 protocol amendment.

The Tiger Global Supreme Court Ruling

The Supreme Court of India in January 2026 ruled in the Tiger Global case that the US investment firm is liable for capital gains tax on its US$1.6 billion sale of shares in Flipkart to Walmart in 2018, highlighting the separate role of India's General Anti-Avoidance Rules (GAAR) and the limits of relying on a tax residency certificate alone, with the case concerning the tax treatment of gains from the sale of Flipkart shares through Mauritius-based entities.

This landmark judgment clarifies that:

• Grandfathering under treaty provisions is distinct from GAAR provisions
• Tax Residency Certificate alone is insufficient to establish substance
• Economic substance must be demonstrated regardless of treaty protection
• GAAR can apply even when PPT doesn't

Capital Gains Tax Treatment Under Amended Treaty

India revised the treaty in 2016, with the amendment granting New Delhi the right to tax capital gains on Indian shares effective from April 2017. The current tax framework operates on three distinct timelines.

Three-Tier Tax Structure

1. Pre-April 2017 Investments (Grandfathered): Shares acquired before April 1, 2017 remain taxable only in Mauritius under Article 13(4), with Mauritius being a major source of foreign investment into India and the treaty's capital gains provisions having shaped decades of inbound investment structuring.

2. Transition Period (April 2017 - March 2019): There was a transition period of two years for the change to the three-decade-old DTAA, during which the tax was limited to half the Indian tax rate, with the full rate applying from FY 2020 onwards.

3. Post-March 2019 Investments: Full Indian capital gains tax rates apply, subject to treaty benefits if PPT test is satisfied.

Current Capital Gains Tax Rates in India

For investments made on or after April 1, 2017 (post-grandfathering period), the following rates apply when treaty benefits are granted:

• Long-Term Capital Gains (LTCG) on Listed Equity: 12.5% (held for more than 12 months)
• Short-Term Capital Gains (STCG) on Listed Equity: 20% (held for 12 months or less)
• Long-Term Capital Gains on Unlisted Shares: 20% with indexation benefit

Calculate your potential tax liability using the Stock Profit Calculator to understand the impact of different holding periods and investment structures.

Practical Implications for Cross-Border Investors

Shell Companies and Conduit Structures at Risk

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 (treaty shopping), with entities that are essentially shell or conduit companies—lacking offices, employees, or operational activity—facing the highest risk of being denied treaty benefits.

What Constitutes Sufficient Substance?

To pass PPT scrutiny, Mauritius entities should demonstrate:

• Physical Presence: Actual office space, not just a registered address
• Qualified Personnel: Employees with relevant expertise making investment decisions
• Operating Expenditure: Companies spending more than ₹27 lakh in Mauritius itself in the preceding 12 months can take advantage of the DTAA
• Board Meetings: Regular board meetings held in Mauritius with independent decision-making
• Banking Operations: Active local bank accounts with genuine transactions

Documentation and Compliance Requirements

Foreign investors must maintain comprehensive documentation including:

1. Tax Residency Certificate (TRC) from Mauritius Revenue Authority
2. Form 10F filed with Indian tax authorities
3. Proof of commercial substance (office lease, employee contracts, utility bills)
4. Board meeting minutes and investment decision documentation
5. Mauritius tax return filings and proof of tax paid
6. Bank statements showing operational transactions
7. Organizational charts and beneficial ownership details

For comprehensive tax compliance, leverage the Bank Statement Analyser to track and categorize your investment-related transactions.

Section 90 and Treaty Notification Requirements

Under Section 90 of the Income-tax Act, 1961, the Protocol needs to be ratified and notified before it comes into force. This procedural requirement has significant implications for treaty application.

MLI and Separate Notification Requirement

Recent tribunal decisions have clarified an important procedural aspect. The Tribunal held that MLI provisions like the Principal Purpose Test cannot apply automatically in India, as treaty changes require country-specific notification under Section 90(1) before enforcement.

The Delhi Bench of the Income-tax Appellate Tribunal held that application of the principal purpose test in the OECD multilateral instrument (MLI) requires separate notification under the India-Ireland income tax treaty, even though India and Ireland both ratified the MLI in 2019 and both designated the India-Ireland treaty as a covered tax agreement.

This principle was affirmed for the India-Mauritius treaty through the October 13, 2026 notification, making the PPT provisions legally enforceable from August 10, 2026.

Comparison: India-Mauritius Treaty vs. Other Jurisdictions

India-Singapore DTAA

Article 6 of the protocol to the India-Singapore DTAA states that benefits in respect of capital gains arising to Singapore residents from sale of shares of an Indian company shall only remain in force till the analogous provisions under the India-Mauritius DTAA continue to provide the benefit, though the concern is that it might not be possible to extend grandfathering protection for investments made before April 1, 2017 to investments made under the India-Singapore DTAA.

India's Broader DTAA Framework

India has also introduced PPT in tax treaties with other jurisdictions:

• India-Sri Lanka DTAA: Notification No. S.O. 3926(E) dated July 16, 2026 notified the Protocol, which entered into force on June 19, 2026
• India-Qatar DTAA: The Government of India notified the revised Treaty signed in February 2025, which shall be effective in India in respect of income arising on or after 1 April 2026
• India-UK and India-Ireland DTAAs: Modified through MLI with PPT provisions requiring separate notifications

Strategic Considerations for Investors

Restructuring Existing Investments

If your investment structure lacks genuine substance, consider:

• Substance Enhancement: Establish real operations in Mauritius with qualified personnel
• Alternative Jurisdictions: Evaluate other treaty jurisdictions with robust substance requirements
• Direct Investment: Consider direct investment into India without treaty routing
• Holding Period Strategy: Leverage grandfathering for pre-2017 investments

Impact on Private Equity and Venture Capital

PE and VC funds face unique challenges:

• Fund Structure Review: Assess whether fund management occurs genuinely in Mauritius
• Investment Committee Location: Ensure investment decisions are made in Mauritius
• Service Provider Agreements: Demonstrate independence from advisors in other jurisdictions
• Carried Interest Treatment: Understand tax implications for fund managers

Tax Planning in the New Regime

Effective tax planning now requires:

1. Commercial Rationale First: Ensure business purpose drives structure, not tax savings
2. Documentation Excellence: Maintain comprehensive records of substance and decision-making
3. Advance Rulings: Consider seeking advance rulings from the Authority for Advance Rulings (AAR)
4. Regular Compliance: File all required forms, certificates, and disclosures timely

For accurate tax calculation under the new regime, utilize the Income Tax Calculator to model different investment scenarios.

Round-Tripping and Revenue Concerns

Round-tripping refers to money from one country going out through unofficial channels and being invested back into the same country from outside to avail of tax benefits under the double tax avoidance agreement (DTAA), with India having signed a DTAA with Mauritius in 1983.

Historical Context

During the 2000-2010 period, the maximum foreign direct investment inflows into the country came through the Mauritius route, with Mauritius pumping in a whopping USD 47.24 billion into the country during the period, constituting 43 percent of the total FDI inflow.

Nearly 42% of FDI into India is routed through Mauritius, and about 40% of the FII fund flow into the country is believed to be routed through the island nation.

Government's Anti-Abuse Objective

The amendment aims to prevent the misuse of tax treaty provisions to avoid or reduce taxes through tax evasion or avoidance. The PPT mechanism is India's alignment with global standards designed to prevent base erosion and profit shifting, which are practices used to artificially reduce tax liabilities.

Real-World Examples and Case Scenarios

Example 1: Compliant FPI Structure

Scenario: A Mauritius-based fund invests ₹100 crore in Indian listed equities in 2020. The fund has:

• Office in Ebene Cybercity, Mauritius with 5 full-time employees
• Annual operating expenses of ₹1.2 crore in Mauritius
• Monthly board meetings in Mauritius with independent directors
• Investment decisions documented and approved in Mauritius
• Regular Mauritius tax return filings

PPT Assessment: Likely to pass PPT test due to demonstrated commercial substance. Treaty benefits should be available. LTCG on listed equity after 12 months would be taxed at 12.5%.

Example 2: At-Risk Structure

Scenario: A Mauritius entity invests ₹50 crore in an Indian startup in 2023. The entity:

• Has only a registered office address (no physical presence)
• No employees in Mauritius
• All decisions made by parent company in Singapore
• Minimal operating expenses in Mauritius (₹5 lakh annually)
• No board meetings held in Mauritius

PPT Assessment: High risk of failing PPT test. Tax authorities may deny treaty benefits. Capital gains could be taxed as per domestic law without treaty relief, potentially at 20% or higher depending on classification.

Example 3: Grandfathered Investment

Scenario: A Mauritius fund acquired shares in an Indian company in 2015 for ₹20 crore, now valued at ₹80 crore.

Tax Treatment: Investments in shares acquired before April 1, 2017, remain grandfathered, meaning they are protected from this specific PPT provision. Capital gains from sale would be taxable only in Mauritius (which has no capital gains tax), resulting in zero tax. However, GAAR may still examine the structure's substance.

Calculate your tax liability for different investment timelines using the Capital Gain Calculator.

Future Outlook and Regulatory Developments

Expected CBDT Guidance

Investors should closely monitor future guidance from the Central Board of Direct Taxes (CBDT), as 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.

Compliance Timeline

Key dates for compliance:

• August 10, 2026: PPT provisions came into force
• October 13, 2026: Official notification by CBDT
• April 1, 2027: Expected first full financial year assessment under new provisions
• July 2027: ITR filing deadline for FY 2026-27, first returns under PPT regime

Impact on Foreign Investment Flows

While in March 2024, Mauritius funds held only 5.61% of the total FPI equity AUM in India, the jurisdiction remains significant. The PPT introduction may lead to:

• Gradual shift toward jurisdictions with clearer substance requirements
• Increased preference for Singapore and Netherlands treaty routes
• More direct investments avoiding treaty routing
• Enhanced compliance and documentation by existing Mauritius entities

Action Plan for Investors and Fund Managers

Immediate Steps (Within 3 Months)

1. Structure Assessment: Conduct comprehensive review of existing Mauritius structures
2. Substance Evaluation: Document current level of economic substance in Mauritius
3. Legal Opinion: Obtain expert opinion on PPT exposure for your specific structure
4. Documentation Audit: Ensure all required certificates, forms, and supporting documents are current

Medium-Term Actions (3-12 Months)

1. Enhance Substance: If gaps exist, strengthen operational presence in Mauritius
2. Alternative Planning: Evaluate restructuring options if enhancement isn't viable
3. Compliance Systems: Implement robust systems for ongoing documentation
4. Tax Provisioning: Adjust financial models to account for potential tax exposure

Long-Term Strategy (Beyond 12 Months)

1. Continuous Monitoring: Track CBDT guidance and tribunal decisions on PPT application
2. Portfolio Review: Regularly assess investment structures against evolving standards
3. Advance Rulings: Consider seeking advance rulings for significant transactions
4. Global Coordination: Align India strategy with overall global tax planning

Use the Form 26AS / TDS Fetch Tool to track all TDS deductions and ensure proper credit against your tax liability.

Frequently Asked Questions

What is the Principal Purpose Test (PPT) in the India-Mauritius tax treaty?

The Principal Purpose Test (PPT) is an anti-abuse provision introduced in the India-Mauritius DTAA that allows tax authorities to deny treaty benefits if obtaining such benefits was one of the principal purposes of an arrangement or transaction. The PPT came into force on August 10, 2026, and shifts the focus from formal documentation to commercial substance. Simply having a Tax Residency Certificate (TRC) is no longer sufficient to claim treaty benefits. Tax authorities can now examine whether the investment structure has genuine commercial rationale or is primarily tax-motivated.

When did the India-Mauritius tax treaty amendment come into force?

The protocol amending the India-Mauritius Double Taxation Avoidance Agreement (DTAA) was signed on March 7, 2024, in Port Louis. After both countries completed their domestic legal procedures, the amended agreement came into force on August 10, 2026. The Central Board of Direct Taxes (CBDT) officially notified the amendment through Notification No. 135/2026-Income-Tax dated October 13, 2026, under Section 159(1) of the Income-tax Act, 1961. The PPT provisions are now applicable to all investment structures routed through Mauritius.

Are investments made before April 1, 2017 protected under the new PPT rules?

Yes, investments in shares acquired before April 1, 2017 remain grandfathered and are protected from the PPT provision. The CBDT issued Circular No. 1/2025 on January 21, 2025, clarifying that grandfathering provisions in tax treaties are excluded from the scope of PPT. However, this does not mean complete immunity from all scrutiny. The Supreme Court's January 2026 ruling in the Tiger Global case highlighted that India's General Anti-Avoidance Rules (GAAR) operate separately from PPT and may still apply to assess commercial substance of structures.

How does PPT affect Foreign Portfolio Investors (FPIs) from Mauritius?

FPIs from Mauritius now face increased scrutiny under the PPT framework. Over 600 FPIs from Mauritius manage approximately ₹50 billion in assets under custody in India, representing about 6% of total FPI holdings. Tax authorities can deny treaty benefits if they determine that the investment structure lacks genuine commercial substance and was primarily established for tax advantages. FPIs must demonstrate actual economic activity, including offices, employees, operational substance, and decision-making in Mauritius. Simply possessing a Tax Residency Certificate (TRC) or filing Form 10F is no longer adequate for claiming treaty benefits.

What is the difference between PPT and GAAR provisions?

PPT and GAAR (General Anti-Avoidance Rules) are both anti-abuse provisions but operate differently. PPT is a treaty-level test introduced through the India-Mauritius DTAA amendment that specifically targets treaty shopping and requires demonstrating that obtaining treaty benefits was not a principal purpose. GAAR, codified in Sections 95-102 of the Income-tax Act, is a domestic law provision that applies more broadly to any impermissible avoidance arrangement. The Supreme Court's Tiger Global ruling in January 2026 clarified that both can operate independently. Even if an investment qualifies under grandfathering provisions against PPT, GAAR may still apply to examine commercial substance.

Conclusion: Navigating the New Era of India-Mauritius Tax Relations

The introduction of the Principal Purpose Test in the India-Mauritius tax treaty represents a watershed moment in India's international tax policy. The days of relying solely on a Tax Residency Certificate to claim treaty benefits are definitively over. Foreign investors must now demonstrate genuine commercial substance, operational reality, and bona fide business purpose in their Mauritius structures.

While the grandfathering of pre-April 2017 investments provides relief to long-term investors, the PPT's application to post-2017 investments demands immediate attention and action. The Supreme Court's Tiger Global ruling further reinforces that treaty protection and GAAR scrutiny operate independently, requiring investors to maintain substance standards even for grandfathered investments.

The key to successful navigation of this new regime lies in proactive compliance, comprehensive documentation, and genuine economic substance. Investors who treat Mauritius as a legitimate business hub rather than merely a tax-efficient conduit will find their structures resilient under PPT scrutiny. Those who fail to establish adequate substance risk significant tax exposure, penalties, and reputational damage.

As India continues aligning its tax treaties with global BEPS standards, we can expect similar PPT provisions in other DTAAs. The India-Mauritius amendment sets the template for future treaty modifications, making it essential for cross-border investors to adapt their strategies to this substance-focused regulatory environment.

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