DTAA Paperwork in the Form 41 Era: TRC, Form 10F, and What Changes on 1 April 2026

A US-based NRI earns Rs 6,00,000 of NRO fixed deposit interest in a year. The bank deducts tax at the domestic non-resident rate of 31.2%, roughly Rs 1,87,200, and credits the rest. The India-US treaty caps tax on that interest at 15%, which would be Rs 90,000. The difference, nearly Rs 97,000, is sitting with the tax department, recoverable only by filing a return and waiting months for a refund. None of that needed to happen. With three documents lodged before the interest was paid, the bank would have deducted Rs 90,000 in the first place. And there is a second twist as of this year: the form you lodge depends on whether the interest hit your account before or after 1 April 2026.

The 30-second answer: To claim a treaty rate in India you need three things, in sequence. First, a Tax Residency Certificate (TRC) from your country of residence (IRS Form 6166 in the US, an HMRC certificate of residence in the UK, an FTA certificate in the UAE, a CRA certificate of residency in Canada). Second, the prescribed Indian declaration filed online: Form 10F for income received up to 31 March 2026 under Section 90, and Form 41 for income received from 1 April 2026 under Section 159(8) of the Income Tax Act 2025. Third, a self-declaration of beneficial ownership and no permanent establishment to your bank or payer. Lodge all three before the income is paid and your NRO interest TDS drops from 31.2% to the treaty rate, commonly 12.5% to 15%.

This is the "how to file it" companion to the conceptual treaty guide. If you want the theory of why a treaty overrides domestic rates and how to read a treaty article, start with DTAA relief for NRIs. This piece is the paperwork: what each document is, where you get it in the US, UK, UAE, and Canada, how the Form 10F to Form 41 switch works, how to file either online (with and without a PAN), what the self-declaration actually says, where each document is used, how long it lasts, and the specific mistakes that get claims rejected. For the full picture of filing your Indian return, this all sits under the NRI ITR filing hub for AY 2026-27.

The whole apparatus exists for one reason: a treaty rate is not automatic. India taxes your Indian income at domestic rates by default. The treaty rate is a benefit you have to claim, and the law makes the TRC and the prescribed declaration the price of admission. Miss the paperwork and you are taxed as if no treaty existed, then left to chase a refund.

The form changed under your feet, and the trigger is the income date

Start with the thing most blogs have not caught up to, because getting it wrong means filing under the wrong statute. India replaced the Income Tax Act 1961 with the Income Tax Act 2025, in force from 1 April 2026. The old Section 90, which granted treaty relief and made the TRC mandatory, is now Section 159, and the declaration that was Form 10F has been renumbered and rebuilt as Form 41 under Section 159(8) read with Rule 75 of the Income-tax Rules, 2026.

The trap is assuming the switch is "whatever you file from April 2026 uses the new form". It is not. The trigger is when the income was received, not when you file or claim it. Income received up to 31 March 2026 stays under the 1961 Act, so it is Form 10F and the old Section 90, and that is exactly what supports your AY 2026-27 return filed this summer. Income received on or after 1 April 2026, which is your current financial year FY 2026-27, falls under the new Act, so it is Form 41. The e-filing portal at incometax.gov.in keeps both alive in parallel: the older form under the 1961 Act, and Form 41 under a separate "Forms as per Income Tax Act 2025" tab.

For most salaried NRIs the practical effect is small but real. If you hold an NRO fixed deposit that pays interest quarterly, the interest credited in the January-to-March 2026 quarter is Form 10F territory; the interest credited from the April-to-June 2026 quarter is Form 41 territory. You may genuinely need both in the same twelve-month window. The good news is that the inputs barely change: the TRC requirement is identical, the no-PE and beneficial-ownership logic is identical, the online filing flow is nearly identical, and the non-PAN registration route survives. Form 41 is more structured (it is laid out in parts covering personal details, tax residency, and the specific treaty between India and your country, and it formally folds in the beneficial-ownership and no-PE declarations rather than leaving them to a side letter), but if you can file Form 10F you can file Form 41. The honest read on the change: it is a renumbering and tidying exercise, not a new hurdle. Do not let a payer tell you the treaty rate is unavailable because "the form changed". The form changed; the right to the treaty rate did not.

The three documents, and what each one does

Keep these distinct, because people conflate them and then wonder why a payer rejected the file.

The TRC is issued by a foreign government. It is the single fact India cannot verify on its own: that you are genuinely a tax resident of the other country. Section 90(4) under the old Act, and Section 159(8) under the new one, both make it mandatory. No TRC, no treaty benefit, full stop.

The Indian declaration (Form 10F, or Form 41 from April 2026) supplies the particulars the foreign TRC may not contain: your status, nationality, tax identification number in the country of residence, the exact period of residence, and your foreign address. Your HMRC or IRS certificate will not carry all of these in the format Indian rules want, so this form is the bridge that translates your foreign certificate into the data fields Indian law expects. Under Rule 21AB (old) and Rule 75 (new) these are the prescribed particulars.

The self-declaration is what banks and other payers ask for to protect themselves. It states two things: that you are the beneficial owner of the income (not a front for someone else, which matters because most treaty interest and dividend articles only give the lower rate to the beneficial owner), and that you have no permanent establishment (PE) in India to which the income is attributable (because if you did, the income would be taxed as business profits, not at the treaty interest rate). Under Form 10F this was a separate letter the bank kept on file. Form 41 pulls the beneficial-ownership and no-PE declarations into the form itself, which is the single most useful change for an ordinary NRI: fewer loose pieces of paper to chase.

Section 159 (formerly Section 90) is the legal hook for all of it. It is the provision that lets a treaty rate override the domestic rate, on the condition that you produce the TRC and the prescribed particulars.

Getting your TRC: the four corridors

The TRC is the slowest piece, so start here. Each country issues it differently, and the lead times vary from days to weeks. This is where 90% of the calendar risk lives.

United States: IRS Form 6166

In the US the TRC is called Form 6166, a letter on US Treasury stationery certifying you are a US tax resident. You do not request Form 6166 directly. You apply by filing Form 8802, the Application for United States Residency Certification, and the IRS issues Form 6166 in response.

The user fee is $85 per Form 8802 for individuals ($185 for non-individual applicants), paid through Pay.gov (search "IRS Certs"). After paying, you mail or fax Form 8802 with the electronic confirmation number to the Philadelphia processing centre. The IRS asks you to apply at least 45 days before you need the certificate, and in practice the queue runs longer: as of early 2026 the IRS was still working through submissions filed several weeks earlier, so plan on 45 to 60 days end to end. The single most common US mistake is leaving it to March when you need it for a summer ITR. You can request Form 6166 for the current year and, in defined circumstances, for the year ahead.

One quirk that causes real rejections: Form 6166 certifies residency on a calendar-year basis, while India runs April to March. Make sure the year on the certificate covers the period your Indian income falls in, and be ready to show that a calendar-2025 certificate and an April 2025-to-March 2026 income period genuinely overlap.

United Kingdom: HMRC certificate of residence

In the UK the document is a certificate of residence (CoR) issued by HMRC. You apply online through the GOV.UK service (or by post), and you must tell HMRC the reason for the request, the double taxation agreement you are claiming under (the India-UK DTAA), the type of income, the relevant treaty article, and the period you need certified.

HMRC typically processes a CoR in four to six weeks. The detail that trips people up: HMRC will only certify a period for which you can show you were UK tax resident under the Statutory Residence Test, and it wants the income type and treaty article named. A vague request gets bounced back for more information, which costs you another cycle. For NRO interest, the relevant article caps Indian tax at 15%, so name interest and that article when you ask.

United Arab Emirates: FTA certificate via EmaraTax

The UAE issues a Tax Residency Certificate through the Federal Tax Authority on the EmaraTax portal. Log in, go to the tax certificate service, and crucially choose the treaty (DTA) version, not the domestic "for other purposes" version, and pick India from the country list. That distinction matters: only the DTA version is the treaty certificate India wants.

Fees as of 2025: an AED 50 submission fee, plus an issuance fee that depends on your status, around AED 500 if you hold a tax registration, AED 1,000 for a natural person without one, with AED 250 extra for a printed hard copy. Approval is fast by global standards, often about five working days. The digital certificate lands in your registered email and is downloadable from EmaraTax. For UAE residents this is the most valuable corridor, because the UAE has no personal income tax, so the treaty rate on Indian interest is the only tax you ever pay on it. Under the India-UAE treaty, tax on interest is capped at 12.5%, lower than the 15% the US, UK and Canada treaties give.

Canada: CRA certificate of residency

In Canada the Canada Revenue Agency issues a certificate of residency. You request it by mail, by phone for the standard letter, or online through My Account using the "Submit Documents" feature. State the foreign country (India), the treaty and specific provision, and the tax year(s) you need certified. Do not confuse this with Form NR73, which is a residency-determination questionnaire, not the certificate itself.

Two practical rules from the CRA. First, your Canadian tax returns must be filed and up to date before they will issue the certificate, so a missing return stalls the whole thing. Second, requests for a future year should not be submitted before October 15 of the current year, and processing can run 60 to 90 days, so the Canadian corridor is the one most likely to miss an Indian quarter-end if you start late. The India-Canada treaty caps Indian tax on interest at 15%.

Filing the Indian declaration online: Form 10F today, Form 41 from April

Form 10F used to be a paper self-declaration you signed and handed over. That is gone. Since the change phased in from 2022, the declaration must be filed electronically on the income tax e-filing portal (incometax.gov.in) by anyone claiming a treaty benefit. A physical, hand-signed Form 10F is no longer valid on its own. The same electronic-only rule carries into Form 41.

If you have a PAN

Log in to the e-filing portal with your PAN as the user ID. Go to e-File, then Income Tax Forms, then File Income Tax Forms, and find the form (it sits under the "Persons not dependent on any source of income" grouping; Form 41 lives under the separate "Forms as per Income Tax Act 2025" tab). Select the relevant assessment year or tax year, fill in the particulars (status, nationality, TIN of your country of residence, the period of residential status, and your address outside India), attach your TRC as a PDF (keep it legible and within the portal's size limit), and submit. You e-verify with an Aadhaar OTP, a net-banking login, or a Digital Signature Certificate. The portal generates an acknowledgement with a transaction ID; that acknowledgement, plus the TRC, is what you give your bank or payer.

If you do not have a PAN

This is the part that confuses people, so here it is plainly. The portal has a registration category for "non-residents not having a PAN and not required to have a PAN." You register with your name, date of birth, country of residence, foreign tax identification number, and address, and you upload ID proof, address proof, and your TRC. The portal issues a user ID, you log in, and you file under that login. Contrary to a lot of older commentary, a Digital Signature Certificate is not mandatory for the non-PAN category: you can authenticate with the Electronic Verification Code (EVC) sent to your registered email. A DSC is optional and some advisers still recommend it for cleaner authentication, but it is no longer the blocker it was made out to be.

The honest read on PAN-less filing: the mechanism works and is officially supported, but it sits in an awkward spot. Section 206AA can require tax to be deducted at the higher of the treaty rate or 20% when the recipient has no PAN, and a separate relief (Rule 37BC) exempts certain payments to non-residents from 206AA if specified details are furnished. Whether your specific income falls cleanly inside that relief is the kind of question where banks differ in practice. For a one-off payment, PAN-less filing is fine. If you have recurring Indian income (an NRO account you will hold for years, rental income, regular capital gains), the cleaner path is to get a PAN. It removes the 206AA ambiguity and makes your year-end refund claim straightforward.

Where each document is actually used

The same documents do work in three different settings. Knowing which setting you are in tells you what to hand over and to whom.

Lowering TDS on NRO interest at the bank. This is the most common use. You give the bank the TRC, the Form 10F or Form 41 acknowledgement, and the no-PE and beneficial-ownership self-declaration. The bank loads the treaty rate and deducts at, say, 12.5% or 15% instead of 31.2% when it credits the quarter's interest. See the banking-side walkthrough in reduce NRO TDS using DTAA and the underlying tax treatment in tax on NRO interest.

Capital gains and other payer-deducted income. When a buyer or a fund house deducts TDS on your capital gains, or a tenant deducts on Indian rental income, the same documents support a lower deduction at source. For gains specifically, treaties more often affect the rate or the right to tax than apply a flat cap, so read capital gains tax for NRIs alongside this; a UAE resident, for instance, can reach zero Indian tax on listed-share gains, which no amount of NRO-interest paperwork achieves.

At the time of filing your return. Even if no payer applied the treaty rate, you can still claim it when you file. You report the income, apply the treaty rate in the return, and the difference between what was deducted and what the treaty allows comes back as a refund. You keep the TRC and the declaration as supporting evidence; the return is where excess TDS turns into a refund.

What this saves, in actual rupees

Take Priya, a UAE-resident NRI, with Rs 8,00,000 of NRO fixed deposit interest for FY 2025-26. Without the paperwork, the bank deducts at the domestic non-resident rate of 31.2% (30% plus cess), which is Rs 2,49,600 withheld and Rs 5,50,400 credited. Because the UAE has no personal income tax, Priya cannot offset that anywhere; her only route to recover the excess is to file an Indian return and wait for a refund.

With the paperwork lodged in time it looks very different. Under the India-UAE DTAA, tax on this interest is capped at 12.5%. Priya obtains her FTA certificate via EmaraTax (DTA version, India selected), files Form 10F online, signs the bank's beneficial-ownership and no-PE declaration, and submits all three in April 2025, before the first quarter's interest is credited. The bank now deducts at 12.5%: Rs 1,00,000 across the year, Rs 7,00,000 credited. The difference, Rs 1,49,600, stays in Priya's hands through the year instead of being locked with the tax department. The cost of capturing it was an AED 50 submission fee plus a modest issuance fee, a free online form, and a signature. Had she submitted only in October, the first two quarters would have been deducted at 31.2% and only the later quarters at 12.5%, with the early excess recoverable only by filing a return. The lesson is timing, not eligibility: she was always entitled to 12.5%; lateness just converts the saving into a refund chase.

Now take Arjun, a US-resident NRI who did not get his documents to the bank in time. For FY 2025-26 the bank deducted at 31.2% on Rs 6,00,000 of NRO interest, which is Rs 1,87,200 withheld. The India-US treaty caps tax on this interest at 15%, so Arjun's correct India liability on the interest is Rs 90,000. At filing, he submits ITR-2 (the form NRIs use) by the July 31, 2026 due date, reports the Rs 6,00,000, applies the 15% treaty rate supported by his Form 6166 and his online Form 10F, and computes tax of Rs 90,000 against TDS of Rs 1,87,200. The result is a refund of Rs 97,200, less any tax due on other Indian income. The treaty benefit is real either way; the only thing the late paperwork cost Arjun was the time value of money, because the Rs 97,200 sat with the department for the better part of a year. Notice also the country gap: had Arjun been UAE-resident on the same Rs 6,00,000, his cap would have been 12.5% and his liability Rs 75,000, a further Rs 15,000 lower, because the India-UAE interest article is more generous than the India-US one.

Here is the third scenario, the one that actually bites this year. Suppose Arjun fixes his process and lodges everything for FY 2026-27. His NRO interest for the April-to-June 2026 quarter is now governed by the Income Tax Act 2025, so the declaration he files is Form 41, not Form 10F, even though his US Form 6166 and the 15% treaty cap are unchanged. If his bank's relationship manager is working from a 2024 checklist and asks only for "Form 10F", Arjun should file Form 41 for the post-April income and hand both the bank: Form 10F for any pre-April 2026 slice, Form 41 for the rest. The cost of getting this wrong is not a higher rate forever; it is a quarter or two deducted at 31.2% while the bank and the borrower argue about which form is valid, with the excess recoverable only at filing.

Validity periods, and why they bite

This is where well-prepared NRIs still get caught, so be precise. A TRC certifies a specific period, a tax year or a stated calendar range. Once that period ends, the certificate is spent; it does not cover the next year. Form 10F and Form 41 are valid only for the period they cover, and that period must match the dates on your TRC. There is no auto-renewal and no carry-forward in the portal. If your form says it covers financial year 2025-26 and your TRC covers calendar year 2025, a payer can reject the mismatch.

The practical rule: refresh the TRC and the declaration every year, and lodge them with your bank or payer early in the Indian financial year (April to March), before the first quarter's interest is credited. Banks set an internal cut-off, often a few weeks before each quarter-end, after which they deduct at the full domestic rate for that quarter regardless of what you submit later. A declaration for a prior period is not considered valid, so last year's file does nothing for this year's interest.

Common rejection reasons and pitfalls

These are the failures I see most often, and all of them are avoidable.

Date mismatch between TRC and the Indian form. The single most common rejection. The TRC period and the Form 10F or Form 41 period must align. A US Form 6166 on a calendar-year basis and an Indian form on an April-to-March basis can clash; state the period carefully and be ready to show the overlap.

Filing the wrong form for the income period. New this year. Income received up to 31 March 2026 takes Form 10F; income from 1 April 2026 takes Form 41. Filing Form 10F for FY 2026-27 income, or Form 41 for AY 2026-27 (FY 2025-26) income, is a fresh category of error that did not exist a year ago.

TRC missing required particulars, or the wrong document entirely. A bank statement, a residency visa, or a "letter of good standing" is not a TRC. It must be issued by the tax authority and certify tax residence. For the UAE specifically, picking the domestic "for other purposes" version instead of the DTA version produces a certificate India will not accept.

Form not filed online. A signed paper Form 10F is not valid on its own. It must be the e-filed version with a transaction ID. The same applies to Form 41.

Submitting after the bank's cut-off. Documents lodged mid-quarter do not retroactively fix that quarter's deduction. Lodge before the income is credited.

Stale documents. Last year's TRC and form do not carry over. Every year is a fresh cycle.

Illegible or oversized TRC upload. The portal rejects unclear or oversized PDF attachments. Scan cleanly and keep within the size limit.

Edge cases

You have multiple banks or payers. Each one needs its own copy of the TRC, the form acknowledgement, and a self-declaration. There is no central registry that tells your second bank you filed; you serve each payer separately.

Your country's tax year is not April to March. The US and the UK do not run on India's financial year. The certificate will state its own period; file the Indian form to match the TRC's period and be ready to explain the overlap. This is a documentation question, not a disqualifier, but it is the leading cause of mismatch rejections.

The treaty rate and the domestic rate are close. For some income the treaty does not help much, and the documentation effort is not worth it. Run the numbers first. For NRO interest at 31.2% domestic versus 12.5% to 15% treaty, it almost always is. For income already taxed lightly, it may not be.

You are RNOR, not a full non-resident. Your residency status drives everything upstream of this. If you are unsure whether you are non-resident, RNOR, or ordinarily resident this year, settle that first in the residency and RNOR rules, because the treaty machinery assumes you are genuinely a tax resident of the other country.

PAN-less filing for recurring income. It works for one-offs but leaves the Section 206AA question hanging. For anything ongoing, get a PAN.

The honest read

The honest read is that this is paperwork, not strategy, and the only skill involved is sequencing and timing. Get the TRC first (it is the slow piece, so start 45 to 60 days ahead for the US, four to six weeks for the UK, about five working days for the UAE, and 60 to 90 days for Canada, mindful of the CRA's October 15 rule). File the Indian form second, with or without a PAN, and make sure it is the right form for the income period: Form 10F for income up to 31 March 2026, Form 41 for income from 1 April 2026. Hand the bank or payer the TRC, the form acknowledgement, and the beneficial-ownership and no-PE declaration third, before the income is paid. Do it in that order, early in the Indian financial year, and your NRO interest TDS falls from 31.2% to the treaty rate at source, with no refund chase.

My one firm recommendation, for the common case of an NRI who intends to keep an NRO account: get a PAN. The PAN-less route is legitimate and now even allows EVC verification without a DSC, but it leaves the Section 206AA question alive and makes your year-end refund clunkier. A PAN costs little, removes the ambiguity, and turns this whole process into a once-a-year routine. The exception is the genuine one-off, a single payment you will never repeat, where registering PAN-less and filing once is the lighter path. And do not treat the documents as a one-time task. They expire every year, silently, and the only way you find out is when a quarter gets deducted at 31.2%. This year, add one item to the annual checklist: confirm which form your income period demands, because for the first time in a decade the answer is not automatically Form 10F.

Related guides

• DTAA relief for NRIs
• The NRI ITR filing hub for AY 2026-27
• NRI residency and RNOR rules
• TDS for NRIs and how to claim refunds
• Tax on NRO interest
• Capital gains tax for NRIs on shares and mutual funds
• Tax on Indian rental income for NRIs
• Reduce NRO TDS using DTAA
• NRE, NRO, and FCNR accounts explained
• The NRO repatriation process
• All taxation guides
• All banking guides
• All investment guides

This guide is general information, not tax advice, and reflects rules and procedures as understood in June 2026. The Income Tax Act 2025 took effect on 1 April 2026, renumbering Section 90 as Section 159 and replacing Form 10F with Form 41 for income received from that date, while income up to 31 March 2026 (AY 2026-27) stays under the 1961 Act and Form 10F. Forms, fees, processing times, and treaty rates change, and the right treatment depends on your specific facts, your country of residence, and the exact treaty article that applies to your income. The position on PAN-less filing and Section 206AA is genuinely unsettled in places. Verify current forms and fees with the relevant authority (the IRS, HMRC, the UAE FTA, the CRA, and the Indian income tax e-filing portal) and consult a qualified chartered accountant or cross-border tax adviser before acting.