ITIN number: who needs one and how to apply (Form W-7)

Who needs an ITIN number?

An Individual Taxpayer Identification Number is issued by the IRS for federal tax purposes. You need a federal tax reason and must be ineligible for a Social Security number. Being new to the United States, by itself, does not establish eligibility. Start with the IRS eligibility guidance.

Possible applicants include some nonresident tax filers, certain spouses or dependents, and some students or researchers. Those descriptions are starting points, not approval categories that apply automatically. The reason you select on Form W-7 must match your actual tax situation. See the W-7 instructions.

Before gathering documents, write down the tax purpose you need the number for. For example, are you preparing a federal return, or checking a documented exception? If you cannot identify that purpose, ask the IRS or a qualified tax professional before sending an application.

SSN for immigrants: check eligibility before Form W-7

Do not apply for an ITIN if you already have an SSN or are eligible to get one. The IRS also says not to file Form W-7 while an SSN application is pending. Use the IRS instructions on Social Security numbers and ask SSA if eligibility is unclear.

SSA explains that noncitizens generally qualify through work-authorized status, with limited nonwork exceptions. Its noncitizen SSN guide directs people who need a tax number and are not eligible for an SSN toward the IRS. Our Social Security number guide explains the application routes.

If SSA determines you are ineligible, the W-7 instructions generally require its denial letter with the application. Certain student, professor, and researcher cases have special instructions. Check your category rather than assuming that every applicant needs the same letter. Read the SSN and box f instructions.

What an ITIN does—and does not—do

An ITIN does not authorize employment, establish immigration status, or qualify you for Social Security benefits. It also does not qualify you for the Earned Income Tax Credit. These limits appear in the IRS ITIN overview. Keep tax identification separate from permission to work.

An application is therefore not a way to speed up an employment authorization case or replace an immigration document. If your immediate problem concerns work permission, confirm the appropriate process with the agency responsible for that permission before choosing a tax-number application.

If your practical question is opening a bank account without SSN, ask the bank what identification it accepts. Do not assume a request for a banking identifier establishes an IRS tax purpose. The IRS eligibility test still applies.

How to apply for ITIN: prepare the application package

As of November 12, 2026, the IRS lists three main parts: Form W-7, a federal income tax return unless an exception applies, and supporting documents. Each family member applying needs a separate W-7. Follow the official application checklist.

1. Check whether you need a new number or renewal of an existing ITIN.
2. Choose the W-7 reason that matches your tax purpose and read its specific instructions.
3. Prepare the required federal tax return, or the documents supporting a filing exception.
4. Gather accepted proof of identity and foreign status, plus dependent evidence where required.
5. Check names, dates, signatures, and the mailing address before submission.

For a first application submitted with a return, leave the applicant’s SSN field on that return blank. The IRS assigns the ITIN, adds it to the return, and forwards the return for processing. Do not send that same return separately. See the IRS submission steps.

An exception is a defined IRS category, not simply a preference to apply without a return. Read the exception table in the W-7 instructions and confirm which supporting letter or other evidence is needed. Get help if the category does not clearly match your circumstances.

Which documents does the ITIN application need?

The IRS generally requires current originals or copies certified by the issuing agency. An ordinary photocopy is not the same thing as an issuing-agency-certified copy. Check the supporting-document rules before paying for certification or placing original identity documents in the mail.

A valid passport can establish both identity and foreign status by itself. Without one, you need a permitted combination of documents, including a photograph subject to dependent exceptions. The IRS accepts a defined list; do not substitute a familiar document that is not on it. Check the accepted evidence.

Dependents may need additional evidence of US residency. A passport without a US entry date may not settle that requirement, and the exceptions depend on the applicant and tax benefit. Use the dependent residency guidance rather than treating an adult applicant’s checklist as a child’s checklist.

Plan around access to your passport. If you need it soon for another appointment or travel, compare in-person authentication before mailing an original. Keep a private checklist of the documents submitted, the submission date, and the address you used; do not post document images in public forums.

Mail, a Certifying Acceptance Agent, or an IRS center?

Mail is one option. The IRS publishes different destinations for US Postal Service mail and private delivery services. Copy the address for your chosen delivery method from the current application page when preparing your package. Do not use the ordinary tax-return address.

A Certifying Acceptance Agent can help complete W-7, authenticate many documents, and submit the package. A standard Acceptance Agent does not have the same authentication role. Fees vary. Verify the provider through the IRS-approved agent directory and ask what its quoted service includes.

CAA authentication has limits. CAAs cannot authenticate foreign military identification cards, and for dependents they can authenticate only passports and birth certificates. Other required evidence may need to be mailed. Check the IRS comparison of application options before assuming every original can be returned immediately.

Selected Taxpayer Assistance Centers provide free ITIN document review by appointment. Their role includes reviewing a completed W-7 and authenticating most supporting documents; it does not include completing the form for you. See the IRS service comparison and ITIN-service center list.

Before choosing help, ask three questions: Will you complete the form, authenticate my particular documents, and prepare the tax return? Those are different tasks. A clear answer helps you arrive with the right materials and understand which work remains your responsibility.

How long does an ITIN application take?

As of November 12, 2026, the IRS says to allow seven weeks for notification about an ITIN application. It publishes a longer estimate of nine to eleven weeks during January 15–April 30 or for applications from overseas. These are estimates, not guaranteed delivery dates. IRS processing guidance.

Keep the ITIN decision separate from tax-return and refund processing. An application estimate does not promise that a refund will arrive in the same period. If you are planning essential payments, avoid treating the application’s expected completion date as money already available.

The IRS says supporting documents are returned within 60 days. Contact the IRS if they have not arrived by then, or if no application notice arrives within its published processing window. Follow the contact route on the application page and have your submission details available privately.

Read any notice carefully. CP565 assigns an ITIN; CP566 requests more information; CP567 says the application was rejected and must be resubmitted. The IRS notice summary explains the distinction. A request for evidence needs a response, not another period of waiting.

When does an ITIN expire, and how do you renew it?

An ITIN unused on a federal tax return for three consecutive tax years expires on December 31 after the third year of nonuse. Renew an expired number if it will be included on a federal tax return. Check the current IRS renewal rules against your own filing history.

Renewal uses Form W-7. Select the renewal option, complete the relevant reason and prior-number information, and follow the current return and supporting-document requirements. Do not request a different number because you moved or misplaced an old notice. See how to renew an ITIN.

An expired ITIN used only on information returns, such as Form 1099, does not need renewal for that use. Filing an income tax return with an expired number can delay processing and affect credits. The distinction matters when someone says a number is “still working.” IRS expiration guidance.

What to check after approval or a later SSN

Keep the assignment notice with your tax records and check the personal details for errors. If your address changes while the application is pending, contact the IRS through its ITIN guidance. A correct mailing address matters for both notices and returned original documents.

If you later receive an SSN, stop using the ITIN and notify the IRS so it can combine your tax records under the SSN. Do not renew the old ITIN. Follow the IRS instructions for a newly assigned SSN for the official notification method.

For your next step, identify what is unresolved: eligibility, a missing document, an IRS notice, or an overdue response. Take that specific question to the IRS or your authorized tax professional. Keep sensitive numbers and documents out of messages to SettleUSA; this site provides guidance and does not process applications.