Double Taxation Avoidance Agreement (DTAA)

A Double Taxation Avoidance Agreement, or DTAA, is a treaty between two countries that decides which country gets to tax which income. Without it, a person or company earning money in one country while living in another could be taxed twice on the same income. A DTAA removes or reduces this double tax. It also helps the two countries share tax information to catch cheats.

Why does it exist?

Imagine a company in Japan that earns interest from a loan it gave to an Indian firm. India says: "This money was earned here, so we will tax it." Japan says: "Our company earned it, so we will tax it." If both tax the full amount, the company loses a big share of its income.

Few investors would invest abroad under such rules. A DTAA acts like a referee. It sets clear rules so that the income is taxed only once, or taxed in both places but with credit given for tax already paid.

The two basic principles of taxing income

Every tax treaty balances two ideas:

• Source rule: The country where the income is earned (the source country) gets to tax it. India, which receives a lot of foreign investment, usually prefers this.
• Residence rule: The country where the earner lives (the resident country) gets to tax it. Rich countries that send investment abroad usually prefer this.

A treaty divides each type of income (business profits, dividends, interest, royalties, capital gains, salaries) between these two rules.

How does a DTAA give relief?

There are two common methods:

1. Exemption method: The income is taxed in only one country. The other country leaves it out completely.
2. Credit method: Both countries can tax it, but the resident country reduces its own tax by the amount already paid in the source country. So the total tax is not doubled.

India also gives unilateral relief. This means that even when there is no treaty with a country, Indian law allows some credit for foreign tax paid.

What is the legal basis in India?

The Constitution lets the Union make treaties (Entry 14 of the Union List covers entering into treaties with foreign countries). The Income-tax Act gives these treaties force inside India. Under the old Income-tax Act, 1961, this was done through Section 90 (treaties with countries), Section 90A (agreements between specified associations, for example with Taiwan) and Section 91 (relief where there is no treaty).

The new Income-tax Act, 2025 combines these into Section 159, which applies to income earned from 1 April 2026. A key rule has stayed the same: a taxpayer can choose whichever is more beneficial, the treaty or domestic tax law. India has comprehensive DTAAs with close to 100 countries and territories [Unverified: exact current count].

What is a Tax Residency Certificate (TRC)?

To claim treaty benefits, a foreign investor must prove it is a resident of the treaty country. It does this with a Tax Residency Certificate, issued by the tax authority of its home country. Whether a TRC alone is enough proof has been one of India's biggest tax fights (see below).

Treaty shopping: the main problem

Some countries charge very low tax and have treaties with India that give generous benefits. Investors from a third country can set up a company in such a country only on paper, often called a shell or conduit company, and invest in India through it. This is called treaty shopping. It is like a shopper who is not a member of a club borrowing a member's card to get the member discount.

The India-Mauritius and India-Singapore story

• The India-Mauritius DTAA was signed in 1983. For decades, capital gains on selling Indian shares were taxable only in Mauritius, where such gains were effectively not taxed. So a huge share of India's FDI and portfolio money came "from" Mauritius.
• In 2000, the tax department issued CBDT Circular No. 789, saying a Mauritian TRC was enough proof of residence. The Delhi High Court struck it down.
• In Union of India v. Azadi Bachao Andolan (2003), the Supreme Court upheld Circular 789. It said treaty shopping was not illegal unless the treaty itself banned it. Using a treaty to lower taxes was a policy matter for the government.
• The India-Singapore DTAA (1994) later gave similar capital gains benefits, which made Singapore another major route.
• In 2016, India amended both treaties. Under the Mauritius protocol (signed 10 May 2016), gains on Indian shares acquired on or after 1 April 2017 became taxable in India (the source country). Shares bought before that date were grandfathered, meaning they kept the old benefit. Gains during a transition period (1 April 2017 to 31 March 2019) were taxed at 50% of India's normal rate, and at the full rate from 2019-20. A similar change was made to the Singapore treaty through a protocol signed in December 2016.

Other tools India uses against misuse

• General Anti-Avoidance Rule (GAAR): Came into force from 1 April 2017 (Chapter X-A of the 1961 Act). It lets the tax department ignore an arrangement whose main purpose is to avoid tax and that lacks real business substance.
• Multilateral Instrument (MLI): An agreement created under the OECD/G20 BEPS project (Base Erosion and Profit Shifting) that updates many tax treaties at once. India ratified it on 25 June 2019. It entered into force for India on 1 October 2019 and applies to India's covered treaties from 2020-21. Its central anti-abuse rule is the Principal Purpose Test (PPT).
• Principal Purpose Test (PPT): Treaty benefits are denied if getting those benefits was one of the main purposes of the arrangement. The India-Mauritius treaty was not covered by the MLI, so India and Mauritius signed a separate protocol on 7 March 2024 to add the PPT. The Mauritian Cabinet approved ratification on 17 July 2026. The protocol comes into force only after both countries formally notify each other that their procedures are complete.
• Tiger Global case (15 January 2026): In Authority for Advance Rulings (Income Tax) v. Tiger Global International II Holdings, the Supreme Court denied Mauritius treaty benefits on Tiger Global's 2018 sale of Flipkart shares. It held the structure was an impermissible tax-avoidance arrangement under GAAR, even though valid TRCs were produced. This marked a sharp shift from the 2003 Azadi Bachao view.

Commonly confused concepts

• DTAA vs BIT (Bilateral Investment Treaty): A DTAA deals with tax on income. A BIT deals with protecting investors (fair treatment, no unfair seizure, dispute settlement). A country can have one without the other.
• DTAA vs FTA (Free Trade Agreement): An FTA cuts customs duties on goods traded between countries. A DTAA covers income tax on money earned across borders.
• Tax avoidance vs tax evasion: Evasion is illegal (hiding income, false accounts). Avoidance uses legal gaps to pay less tax. GAAR and PPT target aggressive avoidance that has no real business purpose.
• Limitation of Benefits (LoB) vs PPT: LoB clauses use fixed objective tests (such as a minimum level of spending in the treaty country) to block shell companies. PPT looks at the purpose behind an arrangement.

Issues, criticism and the way forward

• Revenue loss vs investment: Generous treaties attracted foreign money but cost India large amounts in lost tax, and let some Indian money come back disguised as "foreign" investment (called round-tripping).
• Certainty for investors: Investors value predictable rules. Critics say sudden changes and retrospective tax disputes hurt India's image. The government's position is that closing loopholes protects India's tax base, and grandfathering protects past investment.
• Distorted FDI data: Because money flows through treaty hubs, official "top source country" lists do not show where the money really comes from.
• Way forward: Experts suggest clear guidance on how GAAR and PPT will be applied, faster dispute resolution through Mutual Agreement Procedures (MAP) and Advance Pricing Agreements, and more information-sharing with partner countries.

Concepts to Know

• Capital gains: The profit you make when you sell an asset (such as shares or land) for more than you paid for it.
• Shell company: A company that exists mainly on paper, with little real office, staff or business, often used to pass money through.
• Grandfathering: Letting old cases continue under old rules when a new rule is brought in.
• Round-tripping: Indian money sent abroad and brought back as "foreign" investment, often to get tax or other benefits.
• OECD: Organisation for Economic Co-operation and Development, a group of mostly rich countries that sets many global tax standards. India is not a member but takes part in the BEPS project.
• CBDT: Central Board of Direct Taxes, the body under the Finance Ministry that runs income tax administration.