ITIN vs SSN: What NRIs Need to Know

If you are an NRI dealing with the US tax system, the first acronym you will hit is the one that decides everything else: ITIN or SSN. A Social Security Number opens almost every door in US financial life, and an Individual Taxpayer Identification Number opens a much smaller, more specific set. Knowing which one you have, which one you need, and how to get the right one is the foundation of every cross-border filing you will ever make.

This guide is written for NRIs in two situations: those who are sending money back to India and may need to report it for tax purposes, and those who have US tax filing obligations without a Social Security Number. It walks through what each identifier is, who needs which, how to apply for an ITIN, how the identifier is used at filing time, and the common mistakes people make.

What an SSN and an ITIN Actually Are

A Social Security Number is the nine-digit identifier issued by the US Social Security Administration. Originally created in 1936 to track earnings for retirement benefits, it has expanded to become the default US tax ID and the de facto identifier for credit reporting, banking, employment, and almost every government interaction. You qualify for an SSN if you are a US citizen, a US permanent resident (green card holder), or a non-citizen who has been granted authorization to work in the US by the Department of Homeland Security.

An Individual Taxpayer Identification Number is a different nine-digit identifier, issued by the Internal Revenue Service for the specific purpose of tax administration. It always begins with the number 9. It is available to people who have a US tax filing or reporting requirement but are not eligible for an SSN. An ITIN does not authorize work in the US, does not provide eligibility for Social Security benefits, and does not qualify the holder for the Earned Income Tax Credit. Its job is narrow: it gives the IRS a way to process a tax return or information return for someone the SSN system was not built to cover.

Both numbers serve the same function for the limited purpose of identifying a taxpayer on a return. The IRS treats an ITIN as a fully valid tax ID for filing. The differences appear everywhere else: at banks, at credit bureaus, with the Social Security Administration, and for benefits eligibility.

Who Needs an ITIN

The IRS publishes a specific list of categories that qualify. For NRIs, the most common situations are these.

A non-resident alien who needs to file a US tax return. This is the largest category. Examples: an Indian citizen who earned US rental income in 2025 and needs to file Form 1040-NR. An Indian citizen who is a beneficial owner of a US LLC and needs to file an information return. An Indian author who licensed work to a US publisher and received royalty income.

A non-resident alien claiming a treaty benefit. The US-India Income Tax Treaty has reduced withholding rates on certain categories of income (dividends, interest, royalties). To claim those, the NRI needs an ITIN to be referenced on Form W-8BEN or on the tax return.

A spouse or dependent of a US citizen or resident alien. If a US citizen files jointly with their non-resident spouse, or claims a dependent without an SSN, an ITIN is required for that family member.

A non-resident alien student, professor, or researcher. Specific visa categories (F, J, M, Q) sometimes trigger filing requirements without work authorization, and the ITIN is the right identifier.

A non-resident alien selling US real estate. The Foreign Investment in Real Property Tax Act (FIRPTA) requires withholding when a foreign person sells US property, and the seller needs an ITIN to file Form 1040-NR and reconcile the withholding.

If you are an NRI who has only Indian income, no US filing requirement, and you are not claiming any US treaty benefit, you do not need either identifier. Sending money from your Indian bank account to your US bank account, or vice versa, does not by itself require an SSN or an ITIN.

How to Apply for an ITIN

The application is Form W-7, Application for IRS Individual Taxpayer Identification Number. It is filed with the IRS, not with the Social Security Administration. Three things make this process unusual.

First, you cannot just submit a W-7 by itself. It has to be filed with the tax return that triggers the need for the ITIN. The IRS reviews both together. The exception is if you are applying under a treaty-benefit category, in which case you can file the W-7 standalone with the required treaty documentation.

Second, you have to prove your identity and your foreign status. The IRS requires original documents or copies certified by the issuing agency. A passport is the gold-standard document because it proves both identity and foreign status in one piece of paper. Other combinations work (national ID plus birth certificate, US visa plus driver’s license) but most NRIs simply send the passport.

Third, you have a choice of three submission methods, and the right one for you depends on how comfortable you are sending your passport in the mail.

Mail submission. You send the original W-7, the tax return, and the original passport (or certified copy) to the IRS ITIN Operations address in Austin, Texas. The IRS returns the passport by mail after processing. Processing currently runs 8 to 12 weeks, sometimes longer during peak filing season. This is the cheapest option but also the slowest and the riskiest if you need the passport for travel.

In-person at an IRS Taxpayer Assistance Center. Some TACs in the US handle ITIN applications and certify documents in person, meaning you do not have to part with the original passport. Appointments are required and slots fill up. This works only for NRIs who are physically in the US.

Through a Certified Acceptance Agent. A Certified Acceptance Agent (CAA) is a person or firm authorized by the IRS to verify ITIN-applicant identity and foreign-status documents on the IRS’s behalf. CAAs exist in many countries including India, and they let the applicant keep the original passport throughout the process. The CAA verifies the documents in person, attaches a certificate of accuracy to the W-7, and submits the package. Fees vary; expect a couple hundred dollars on top of any tax preparation work. For NRIs in India this is usually the most practical route.

The IRS publishes a current list of approved CAAs by country on irs.gov. Pick one with a real address and a track record before sending anything sensitive.

Using an ITIN for Tax Reporting

Once issued, the ITIN goes wherever a tax ID is required on an IRS form. The most common places.

Form 1040-NR, the non-resident alien tax return. The ITIN appears in the taxpayer-ID field at the top.

Form W-8BEN, the certificate of foreign status of beneficial owner. Submitted to a US payer (a bank, a brokerage, a publisher) to claim a reduced treaty withholding rate. The ITIN is entered in the foreign tax ID field, alongside or instead of the foreign tax identifier from the home country.

Form 1042-S, the information return that US payers issue to non-resident aliens for US-source income. The recipient’s ITIN is referenced.

Form 8843, the statement for non-resident exempt individuals (students, teachers, trainees) that establishes treaty-based exemption from substantial presence.

The ITIN is not a one-time use number. It stays with the holder. If it goes unused on a federal tax return for three consecutive years, the IRS deactivates it; renewal is a one-page form. NRIs who file every year or two will never run into the deactivation issue.

Common Issues NRIs Run Into

A handful of mistakes account for most of the slowed-down or rejected applications.

Sending uncertified copies of the passport. A regular photocopy of your passport is not accepted. The copy has to be certified by the issuing agency (in India, that means the Indian passport office or the Indian embassy in the US) or you have to send the original, or you have to go through a CAA. Skipping this is the single largest reason a W-7 comes back.

Missing the tax return. Unless you are filing under a treaty-only exception, the IRS expects the W-7 and the tax return together. Sending the W-7 alone results in a rejection letter.

Wrong reason code on the W-7. The form asks for a category code (a, b, c, d, e, f, g, h) that explains why you need the ITIN. Picking the wrong one is a common cause of correspondence back and forth.

Address mismatches. If the address on the W-7 does not match the address on the supporting documents (passport, tax return), the IRS may pause processing to verify. Use a single consistent address.

Trying to use an ITIN as if it were an SSN. This is the most expensive mistake, because it does not come back as a quick rejection; it comes back as a denied credit at filing or a denied bank account. The ITIN cannot be used for the Earned Income Tax Credit, for Social Security benefits, or in most cases as a stand-in for an SSN on a credit application.

Real-World Scenarios

A US Citizen Filing Jointly With a Non-Resident Spouse

You are a US citizen working in San Francisco. Your spouse is an Indian citizen who lives with you on an H-4 visa with no work authorization. You want to file jointly to take the higher standard deduction and the lower joint tax brackets. Your spouse needs an ITIN. You file Form W-7 with your joint 1040, attach the spouse’s passport (or use a CAA), and the IRS issues the ITIN and processes the return in one shot.

An NRI Filing After Selling a US Rental Property

You inherited a small condo in Phoenix from a relative and sold it last year. The closing agent withheld 15 percent under FIRPTA. To get the over-withheld portion back, you need to file Form 1040-NR and reconcile the actual tax owed. You apply for an ITIN with the return.

A Royalty Earner Reducing Withholding

You are an author in Mumbai whose US publisher pays royalties twice a year. Without a W-8BEN on file, the publisher withholds 30 percent. With a W-8BEN citing the US-India tax treaty, the rate drops to 15 percent. The W-8BEN requires either an SSN or an ITIN. You apply for the ITIN through a CAA in Mumbai and the publisher updates your withholding the following payment cycle.

ITIN vs SSN at a Glance

Feature	SSN	ITIN
Issuing agency	Social Security Administration	Internal Revenue Service
Starts with	Various	Always 9
Work authorization	Yes (if accompanied by employment-eligible status)	No
Tax filing	Yes	Yes
Earned Income Tax Credit eligibility	Yes	No
Social Security benefits	Yes	No
Credit reporting (Equifax/Experian/TransUnion)	Standard	Limited; some lenders accept
Required documentation	Birth certificate or passport plus immigration documents	Passport (or specific document combinations)
Processing time	Same day at SSA office	8 to 12 weeks via IRS

Money Movement and Tax Reporting for NRIs

A common follow-up question for NRIs after sorting out the right tax ID: does sending money between the US and India trigger a reporting obligation on its own?

The answer depends on the direction and the amount.

Sending money from the US to India for personal use (gifts to family, support payments, your own NRE/NRO account) is not income to the recipient and is generally not reportable on the US side, but US banks file FinCEN reports for transfers above their internal thresholds and you should expect to be asked about source of funds for larger amounts.

Sending money from India to the US is subject to the Liberalised Remittance Scheme on the India side, which caps individual outward remittances at USD 250,000 per financial year for permitted personal purposes (tuition, medical treatment, family maintenance, travel, donations).

Receiving income in either direction (rental, interest, dividends, royalty) is the part that flows through the tax return and references your ITIN or SSN.

Travel Tip: Cleaner Money Movement on the Remittance Side

Sliq Pay is a US-regulated cross-border payments app built for NRIs sending USD to India and for the reverse direction (launching soon). On the consumer USD-to-India side, you link your existing US bank account, complete KYC in about 10 seconds, and send to any Indian bank account, UPI ID, phone number, or email. The app uses mid-market (Google) FX rates with no markup, transfer fees of 0.3 to 0.5 percent, and instant settlement up to 200,000 rupees on UPI and 500,000 rupees on IMPS. Sliq Pay Inc. is registered with FinCEN (NMLS ID 2714589, MSB Registration 31000298221871). It does not replace the need to file with a correct tax ID, but it does make the underlying money movement transparent enough that documentation for tax purposes is straightforward. Join the waitlist at sliq-pay.com.

FAQs

Can I use my ITIN to open a US bank account?

Some US banks accept an ITIN in lieu of an SSN for account opening, particularly the larger national banks and some community banks with sizable NRI customer bases. Policies vary by bank and by state. Walk into the branch with your ITIN letter from the IRS, your passport, and proof of address.

Does an ITIN give me any work authorization?

No. The ITIN is solely for tax administration. Work authorization comes from the Department of Homeland Security (an EAD, an H-1B approval, a green card, etc.), and the SSN follows that.

How long does it take to get an ITIN if I file by mail?

The IRS processing window is 8 to 12 weeks, sometimes longer during peak season (January through April). A CAA can submit on your behalf without you parting with your passport, but the IRS-side processing time is the same.

Can I file my US tax return before I get the ITIN?

The Form W-7 and the tax return are filed together. The IRS issues the ITIN as part of processing the return. You do not need an ITIN in hand before mailing the package.

What if my ITIN was issued years ago and has expired?

The IRS deactivates ITINs that go unused on a federal tax return for three consecutive years. Renewal is a one-page Form W-7 marked as a renewal. Send it with the next return.

Do I need an ITIN to receive a remittance from a family member in the US?

No. Receiving money in India for personal use is not a US tax event and does not require an ITIN. The sender’s US tax position depends on their own filing situation, not yours.

Is my Indian PAN the same as an ITIN?

No. The Indian Permanent Account Number is a tax ID issued by the Indian Income Tax Department for filings inside India. It has no standing in the US tax system. NRIs filing in both countries hold both numbers.

Where do I send the W-7 application?

To the IRS ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. Verify the current address on the W-7 instructions before mailing — the IRS updates it periodically.

Before You Go

Sorting out whether you need an ITIN or an SSN is the foundation of every other US tax decision an NRI makes. For most NRIs the answer is straightforward: if you have a US filing requirement and you do not qualify for an SSN, the ITIN is your path. The application is paperwork-heavy but mechanically simple, and using a Certified Acceptance Agent in India or another home country removes the biggest practical headache (sending your passport in the mail). Pair the right tax ID with a transparent cross-border payments app like Sliq Pay for the money-movement side, and the documentation burden of cross-border life shrinks meaningfully.

Disclaimer

The information provided on this blog is for general informational purposes only and does not constitute legal, financial, tax, or professional advice. Product features, pricing, eligibility, and availability may vary by country, user type, regulatory requirements, and are subject to change.

Please refer to Sliq Pay’s Terms of Use and official product pages for the most accurate and up-to-date information. Sliq Pay makes no representations or warranties regarding the completeness, accuracy, or reliability of the content.