The phrase double taxation avoidance agreement sets an expectation the instrument does not meet. It does not create a zone where income escapes tax. It allocates taxing rights between two countries and gives a mechanism so the same income is not fully taxed in both. The distinction decides most of the questions people actually have.
What the Act says about treaties
The Income-tax Act, 2025 empowers the Central Government to enter into agreements with the government of any other country or any specified territory, and to notify provisions to implement them. It also lets a specified association in India enter into an agreement with a specified association in a specified territory, with the Central Government notifying it.
The purposes are set out expressly: granting relief in respect of income on which tax has been paid both here and in the other country, avoidance of double taxation of income under this Act and the corresponding law there, exchange of information for the prevention or investigation of evasion or avoidance, and recovery of tax. Notably, the Act now frames avoidance of double taxation as being without creating opportunities for non-taxation or reduced taxation through evasion or avoidance, including through treaty shopping arrangements. That framing is the reason revenue authorities look harder at arrangements whose only purpose is a lower rate.
The engine of the whole thing
Where such an agreement applies to you, the Act provides that its provisions apply to the extent they are more beneficial to that assessee. You are not made to choose between the treaty and the Act once and for all. You take whichever is better on the point in question. That single rule is what people mean when they say the treaty overrides domestic law, and it is more precise than that: the treaty prevails where it helps you, and the Act applies where it does not.
There is a carve out. The Act says the general anti-avoidance chapter applies even where it is not beneficial to the assessee, so the more beneficial rule does not shelter a structure from those provisions.
The Act states that an assessee who is not a resident is entitled to claim relief under a treaty only where he obtains a certificate of his being a resident in that country or specified territory from the government of that country, and provides the other prescribed documents. Obtaining one takes time in some jurisdictions and it must cover the right period. Start it before the transaction, not when the bank asks.
Where the treaty helps most, and least
- Immovable property in India. This is where NRIs are most disappointed. Rent from and gains on Indian land are, under the ordinary pattern of these treaties, taxable in India as the country where the property is situated. The treaty does not remove that. Your relief is a credit against the tax in your country of residence, which you claim there, not here.
- Interest and dividends. Here a treaty often does reduce the Indian rate, and the reduction can be applied at the deduction stage rather than claimed back later.
- At the point of deduction. The Act defines the rates in force for a deduction on a payment to a non-resident as the rate specified in the Finance Act of the relevant year or the rate provided in a notified agreement, whichever is applicable. So a treaty rate is not merely a refund claim. It can lower what is taken at source, provided the certificate and documents are in place.
- Terms and definitions. The Act sets out an order of priority for the meaning of a term used in a treaty, starting with the definition in the agreement, then the Act, then a notification by the Central Government, then other central legislation. Arguments about whether an amount is rent, business income or a fee are resolved through that ladder.
Four practical points
- The treaty does not excuse the Indian return. If your Indian income crosses the filing threshold, or tax has been deducted that you want back, you file here, and you claim the treaty position in that filing.
- Credit is claimed in the other country, on that country's rules. Timing differences between the Indian tax year and the foreign one are the commonest cause of a credit being lost, and that is a question for an adviser where you live.
- Read your own treaty, not a summary. The agreements are not uniform, and the article dealing with capital gains in particular differs between them.
- Keep the deduction certificates. The foreign authority granting credit will want evidence of the Indian tax actually paid, and a deduction certificate issued to the wrong permanent account number is difficult to fix later.
Where it bites in practice
The two transactions where NRIs meet all of this at once are a property sale and a remittance. On a sale, the deduction needs to account for the chargeable sum and any applicable certificate or determination, and a treaty position is part of what supports that application, as our guide on tax deduction when an NRI sells Indian property explains. On a remittance, the bank asks for the reporting forms and the accountant's certificate before the money leaves, and our guide on repatriating money from India as an NRI covers that channel. The treaty position on your particular income, and whether it improves on the Act, should be confirmed with a chartered accountant here for the relevant tax year, and with a tax adviser in the country where you are resident.