It's one of the most expensive doubts in this field: many people apply for an ITIN they don't need, and others have needed one for years without knowing it. Three questions and you'll know which of the two groups you're in.
The ITIN exists for one thing only: to identify you to the IRS when you have a personal U.S. tax obligation and cannot get an SSN. Nothing more, nothing less.
The ITIN is exclusively for people who are not eligible for a Social Security Number. If you can get an SSN, the IRS will not issue you an ITIN — and if you already have both for some historical reason, the SSN is the one that's used.
This is the most common case and the most misunderstood. A single-foreign-owner LLC, operated 100% remotely, files Form 5472 + pro forma 1120 using the LLC's EIN — not your personal number. If you have no personal return (1040-NR) to file, the ITIN is not a requirement to exist or to comply.
Rental income from U.S. real estate is U.S.-source income and is reported on a 1040-NR in your name. That personal return needs an identifier: since you can't have an SSN, it goes with an ITIN.
When you sell, FIRPTA means up to 15% of the sale price is withheld. To request a reduction of that withholding (Form 8288-B) or to recover the excess on your 1040-NR, you need an ITIN. Without it, your money stays with the IRS.
Calculate how much would be withheld in our FIRPTA calculator.
As a foreign partner in a U.S. partnership, you receive a K-1 and the partnership must identify you. If that partnership generates effectively connected income (ECI), you have to file your own 1040-NR — and there the ITIN is indispensable.
To claim a treaty rate on dividends or interest with a broker, the W-8BEN is generally enough — and it accepts your foreign tax identification number (from your country). An ITIN isn't always needed.
Unsure about the form? See the W-9 vs W-8BEN quiz and the withholding by country calculator.
Spouses and dependents who cannot get an SSN need an ITIN to be included on a U.S. return. It is applied for together with the return they appear on, not separately.
The ITIN is issued for tax obligations, not banking ones. The IRS doesn't grant it "to open an account": an application without a return or a supporting exception is rejected.
Providing services while physically in the U.S. can generate connected income (ECI) and, depending on the days you spend, even make you a tax resident under the substantial presence test. That changes everything: which form you file and whether you need an ITIN or an SSN.
If you're not clear on whether you're eligible for an SSN, that's the prior question: it defines whether the ITIN even applies to you. A work visa, a pending green card or substantial presence change the answer completely.
The ITIN is requested with Form W-7. The form itself has no fee; what you pay for is the preparation and, where applicable, document certification.
The W-7 requires you to mark why you're applying. The most common for non-residents is filing a 1040-NR; there are also exceptions for cases where there is no return yet. Marking the wrong reason is the number one cause of rejection.
Unless you qualify for an exception, the W-7 is filed together with the tax return. It isn't a standalone procedure: no return and no exception means no ITIN.
The passport is the only document that works on its own. The IRS requires originals or copies certified by the issuing authority — or you can use a Certifying Acceptance Agent (CAA), who verifies and returns your passport on the spot instead of you mailing it.
The IRS usually takes around 7 weeks, and considerably longer in peak season (January to April). Plan the application with time to spare before your deadline.
An ITIN that isn't used on a return for 3 consecutive years expires on December 31 of the third year. Renewing it is another W-7. That's why it's not worth getting one "just in case."
No. It is only a number for tax purposes. It doesn't authorize work, doesn't grant immigration status and doesn't qualify you for Social Security benefits.
No. The EIN is requested with Form SS-4 and, without an SSN/ITIN, it's handled by fax or mail (or by phone for international applicants). They are two different numbers, with different procedures.
Some institutions accept it as identification, but that doesn't make it a valid reason for the IRS to issue it. And for the platforms most used by non-residents, it isn't even needed.
Yes: if it doesn't appear on a federal return for three consecutive years, it expires automatically. There were also waves of expirations by digit ranges in previous years.
Yes, it's something you can do on your own. The downside is that a rejection costs months: wrong reason marked, uncertified documents or an incomplete return and you start over.
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