DTAA Explained: How NRIs Can Avoid Double Taxation

Picture an NRI in Dubai or London who earns rental income from a flat in Mumbai. India, as the country where that income arises, taxes it. But the NRI's country of residence — if it taxes residents on their worldwide income, as many do — can claim the right to tax the very same rupees again. Left unresolved, that's double taxation: two governments, one income, two tax bills. A Double Taxation Avoidance Agreement, or DTAA, is the treaty mechanism India has built with close to a hundred countries specifically to stop that from happening, and to make sure at least one side backs off or credits what the other has already collected.

Why the Same Rupee Can Get Taxed Twice

The overlap happens because countries tax on two different principles at once. India taxes on a source basis — if income arises within India, India claims the right to tax it, regardless of who earns it or where they live. Most countries NRIs settle in layer residence-based taxation on top of that, taxing their tax residents (and, in the US's case, their citizens, wherever they live) on income earned anywhere in the world. An NRI resident in one of these countries sits at the intersection: India taxes the India-sourced income at source, and the country of residence taxes the same income again as part of that person's global income. The DTAA between the two countries decides which one actually collects, or how the burden is split.

Exemption Method vs Credit Method: The Two Ways Relief Actually Works

DTAAs resolve the overlap in one of two ways, and the specific treaty article for each income type tells you which applies. Under the exemption method, the treaty hands one country the exclusive right to tax a particular kind of income, and the other country simply leaves it out of its own computation entirely — no double tax arises because only one side ever taxes it. Under the credit method, both countries retain the right to tax, but the country of residence allows a credit against its own tax liability for the tax already paid in the source country, so the taxpayer effectively pays the higher of the two rates rather than the sum of both. The relief mechanism on the Indian side — historically Sections 90, 90A and 91 of the 1961 Act, now consolidated as Sections 159 and 160 of the Income Tax Act, 2025 — leans on the credit method for the income types NRIs deal with most, such as interest, dividends, and capital gains, while the exemption method tends to show up for narrower categories like specified government service or shipping income.

TRC and Form 10F: The Paperwork That Unlocks the Treaty Rate

None of this happens automatically. Left to the default domestic rate, Indian banks and payers withhold tax at the flat rate prescribed under Indian law — often around 30% plus surcharge and cess on NRO interest, for instance — regardless of what the treaty actually allows. To get the lower treaty rate applied at source, rather than waiting a year to claim a refund, an NRI has to proactively hand the payer two things: a Tax Residency Certificate (TRC) from the tax authority of their country of residence, and, in most cases, a self-declaration in Form 10F filed electronically on India's income tax portal to supply whatever details the TRC leaves out. Banks typically also ask for a simple declaration that the income isn't connected to a permanent establishment or business presence in India. Skip this paperwork, and the treaty rate simply doesn't get applied — the higher domestic rate does, by default.

Why You May Still Need to File an Indian Return

Even after a treaty rate has been correctly applied at source, many NRIs still need to file an Indian return — to reconcile the tax actually deducted against what was really due, to claim a refund if the payer withheld at the domestic rate before the paperwork came through, or simply because their total India income crossed the mandatory filing threshold. The reverse situation comes up too: if you happen to qualify as resident (ROR or RNOR) in a particular year and have foreign income that's also been taxed abroad, the relief runs the other way — you claim credit for the foreign tax paid against your Indian liability on your Indian return, using the relevant treaty article and the prescribed cross-border tax credit form.

DTAA relief is a right you have to exercise, not a benefit that applies itself. Renew your TRC and Form 10F every year, hand them to your bank or payer before the income is credited rather than after, and keep every certificate on file — because the moment the paperwork lapses, the default domestic rate takes over, and getting your money back turns into a filing-season project instead of a non-issue.