Who Is Eligible for an ITIN? The 5 Categories

Written by

itin.so Editorial Team

IRS-Authorized Certifying Acceptance Agents · Updated September 2026

Five groups are eligible for an ITIN: nonresident aliens required to file a US tax return, resident aliens filing under the substantial-presence test, dependents or spouses of US citizens and resident aliens, dependents or spouses of nonresident visa holders, and nonresident aliens claiming a treaty benefit. You are not eligible if you already hold an SSN or are eligible to obtain one.

Key fact

Eligibility is decided by your tax purpose, not your immigration status. Every eligible applicant fits one of the eight reason codes on Form W-7, lines a through h, and you check exactly one. The code you choose determines which documents you file and whether a tax return has to be attached.

The five eligible categories

Find the one that describes you. The reason code column is what you check on Form W-7.

1. Nonresident aliens required to file a US tax return

You have US-source income that triggers a Form 1040-NR filing obligation. Foreign owners of US LLCs, Amazon and Etsy sellers, landlords with US rental property and freelancers paid by US clients land here most often.

W-7 reason code: b, and f for students, professors and researchers
Tax return required: Yes, Form 1040-NR attached to the W-7

2. US resident aliens filing under the substantial presence test

You are not a citizen or green card holder, but you were physically present in the US long enough to be taxed as a resident. The test counts all days this year, a third of last year's days and a sixth of the year before, and 183 days triggers it.

W-7 reason code: c
Tax return required: Yes, Form 1040 attached to the W-7

3. Dependents or spouses of US citizens and resident aliens

Your spouse or parent is a US citizen or resident alien filing a return, and you need a taxpayer number to appear on it. A spouse filing jointly is the most common case.

W-7 reason code: d for dependents, e for spouses
Tax return required: Yes, the sponsoring taxpayer's return

4. Dependents or spouses of nonresident aliens holding a US visa

The visa holder is a nonresident alien, and you are their dependent or spouse. H-4, L-2 and J-2 family members are the typical applicants.

W-7 reason code: g
Tax return required: Usually yes, with the visa holder's return

5. Nonresident aliens claiming a tax treaty benefit

A tax treaty between the US and your country reduces or eliminates withholding on your US income, and you need an ITIN to claim it. Scholarship and royalty income are common triggers.

W-7 reason code: a, and f for students claiming an exception
Tax return required: Often no, under a documented exception

Form W-7 reason codes a through h, mapped to the five categories

Form W-7 asks you to check one box on lines a through h. Checking the wrong box, or more than one, is a common cause of rejection. This is the mapping between the IRS reason codes and the five eligible categories above.

Box	IRS reason for applying	Category
a	Nonresident alien required to get an ITIN to claim tax treaty benefit	Category 5
b	Nonresident alien filing a US federal tax return	Category 1
c	US resident alien (based on days present in the United States) filing a US federal tax return	Category 2
d	Dependent of US citizen/resident alien	Category 3
e	Spouse of US citizen/resident alien	Category 3
f	Nonresident alien student, professor, or researcher filing a US federal tax return or claiming an exception	Category 1 or 5
g	Dependent/spouse of a nonresident alien holding a US visa	Category 4
h	Other	Outside the five

Box h covers reporting obligations that sit outside the five categories, such as third-party withholding on passive income and mortgage interest reporting by a lending institution. Reason codes are taken from the IRS Instructions for Form W-7, checked September 2026.

What documents does each category submit?

Every applicant must prove identity and foreign status. A valid unexpired passport is the only document that does both on its own. Without a passport you need two documents from the IRS list of 13. What changes by category is what goes on top of that.

Category	Files with Form W-7
1. Nonresident filing a return	Passport, plus Form 1040-NR. Students, professors and researchers add their visa, Form I-20 or DS-2019, and a letter from the sponsoring institution.
2. Resident alien	Passport, plus Form 1040 and evidence of days present if the substantial presence count is queried.
3. Dependent or spouse of a US citizen or resident	Passport, plus the sponsoring taxpayer's return. Dependents also need US residency proof unless the passport carries a US date of entry stamp.
4. Dependent or spouse of a nonresident visa holder	Passport and a copy of the visa, plus the same dependent residency rule as category 3.
5. Treaty benefit claimant	Passport, plus the treaty article number and country, and the withholding agent letter or Form W-8BEN that evidences the exception.

The dependent trap

A passport without a US date of entry stamp is no longer accepted as a stand-alone identification document for dependents. Those applicants must add US residency proof: medical records for a dependent under 6, school records for a dependent under 24 who is a student, or a US utility bill or lease showing the dependent's name and address otherwise.

The complete list is on the ITIN documents required page.

Who is not eligible for an ITIN?

Two disqualifying conditions cover almost every ineligible applicant:

You hold a Social Security Number. An ITIN and an SSN cannot coexist. If you get an SSN later, stop using the ITIN and ask the IRS to merge the records.
You are eligible for a Social Security Number, even if you have not applied. Work-authorized visa holders fall here. The IRS expects you to apply to the SSA instead, and will reject the W-7 if it sees SSN eligibility.

Beyond those two, there is a third case that catches people out: having no US tax purpose at all. An ITIN is issued to process a filing or reporting obligation. Wanting a US bank account, a driver's licence or a credit file is not, by itself, a qualifying reason, and a W-7 submitted on that basis is rejected.

Why eligible applicants still get rejected

Eligibility and approval are different things. The IRS sends notice CP567 when it rejects a W-7, and it states the specific reason. The recurring ones:

No reason code, or the wrong one. Exactly one box between a and h must be checked, and it has to match the documents and return you attach.
No tax return attached where the reason code requires one, and no documented exception supplied.
Expired identity documents, or a name on the document that does not match the name on the W-7. Marriage name changes are a frequent cause.
A dependent passport with no US date of entry stamp and no supporting residency evidence.
An unsigned form. Rejected automatically. A parent or guardian signs for an applicant under 18.
Photocopies instead of certified copies. The IRS takes original documents or copies certified by the issuing agency. It does not accept notarised copies.

There is no limit on reapplying. See what to do after an ITIN rejection.

Still not sure which category you are in?

Two pages answer the adjacent questions: ITIN requirements covers what you have to supply, and what you can do with an ITIN covers what it is good for once issued. If your situation is a dependent or spouse case, the dependent and spouse guide goes deeper on the residency evidence rules.

ITIN eligibility questions

Who is eligible for an ITIN?

Five groups are eligible for an ITIN: nonresident aliens required to file a US tax return, US resident aliens filing under the substantial presence test, dependents or spouses of US citizens and resident aliens, dependents or spouses of nonresident aliens holding a US visa, and nonresident aliens claiming a tax treaty benefit. Each maps to a reason code on Form W-7: codes b and f, c, d and e, g, and a respectively. You are not eligible if you already hold a Social Security Number or are eligible to obtain one.

What are the requirements to get an ITIN number?

You need three things: a federal tax purpose that fits one of the Form W-7 reason codes a through h, proof of identity and foreign status, and, for most applicants, a completed federal tax return attached to the W-7. A valid unexpired passport is the only document that proves identity and foreign status on its own. Without one you must supply two documents from the IRS list of 13. Dependents face an extra requirement: a passport without a US date of entry stamp no longer works as a stand-alone document, so they generally add US residency proof.

Who is eligible to get ITIN?

Anyone with a US federal tax filing or reporting obligation who cannot get a Social Security Number. That covers nonresident aliens filing a return or claiming a treaty benefit, resident aliens who meet the substantial presence test, and the dependents and spouses of both US citizens or residents and nonresident visa holders. Immigration status is not a criterion. The IRS issues ITINs regardless of immigration status, because the ITIN exists to process tax, not to confer status or work authorization.

Do I need an ITIN if I have a Social Security Number?

No. If you have a valid SSN, you cannot get an ITIN. The IRS issues ITINs only to individuals ineligible for a Social Security Number who still have a US tax filing obligation under IRC Section 6109. If you later become eligible for an SSN, stop using your ITIN and notify the IRS to merge your tax records.

Can undocumented immigrants get an ITIN?

Yes. Immigration status does not affect ITIN eligibility. The IRS issues ITINs to anyone with a US tax obligation regardless of immigration status. Under IRC Section 6103, the IRS is prohibited from sharing ITIN applicant information with immigration enforcement agencies. Filing taxes with an ITIN demonstrates compliance with federal law.

Do foreign students in the US need an ITIN?

F-1 visa students with on-campus or OPT/CPT employment receive an SSN through their employer. However, F-1 students who earn taxable scholarship or fellowship income without employment authorization, or who need to claim tax treaty benefits, must get an ITIN. They apply under W-7 reason code f, which covers nonresident alien students, professors and researchers. F-1 students are non-resident aliens for tax purposes during their first 5 calendar years.

Does my spouse need an ITIN to file taxes jointly?

Yes, if your spouse lacks an SSN. Both spouses need a taxpayer identification number for a joint return. Your spouse applies under W-7 reason code e, spouse of a US citizen or resident alien, by submitting Form W-7 with your joint tax return and a valid passport. Filing jointly provides a larger standard deduction and wider tax brackets.

Can I get an ITIN if I live outside the United States?

Yes. Most ITIN applicants live outside the US. You can apply from any of 150+ countries by mailing Form W-7 to the IRS ITIN Operation in Austin, TX 78714-9342, or by using a Certifying Acceptance Agent remotely. There is no requirement to visit or reside in the United States at any point during the application.

Is an ITIN the same as a work permit?

No. An ITIN is strictly a tax processing number under IRC Section 6109. It provides zero work authorization, does not change immigration status, and does not provide eligibility for Social Security benefits. Only an SSN paired with valid immigration documentation permits legal employment in the United States.

Why would the IRS reject an ITIN application from an eligible applicant?

Eligibility is not enough on its own. The IRS issues a CP567 rejection notice for an incomplete Form W-7, a missing or wrong reason code, identity documents that are expired or do not match the name on the form, a missing federal tax return where one is required, a dependent passport with no US date of entry stamp, an unsigned form, or an applicant who turns out to be eligible for an SSN. The notice states the specific reason, and there is no limit on reapplying.

Eligible? We will file the W-7 for you

We pick the right reason code, assemble the documents for your category, and verify your passport as an IRS-authorized Certifying Acceptance Agent, so the original never leaves your hands.

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