Can You Fax Form W-7 to the IRS? No — Here's How to Apply for an ITIN (2026)

Fax numbers and IRS rules change often — always verify on irs.gov before sending. General information only, not tax advice.

What Is Form W-7?

Form W-7, officially titled "Application for IRS Individual Taxpayer Identification Number," is the form used to apply for an ITIN — and to renew an ITIN that is expiring or has already expired. An ITIN is a 9-digit number the IRS issues to people who need a U.S. taxpayer identification number for federal tax purposes but aren't eligible for a Social Security number (SSN).

Per irs.gov, an ITIN is strictly a tax processing number. It does not:

• •Authorize you to work legally in the U.S.
• •Qualify you for Social Security benefits or the Earned Income Tax Credit
• •Provide or change immigration status
• •Serve as identification outside the federal tax system

Who Needs an ITIN?

You need an ITIN if you must have a U.S. taxpayer identification number for federal tax purposes but you don't have — and aren't eligible to get — an SSN. Per the Form W-7 instructions, common examples include:

• •Nonresident aliens required to file a U.S. federal tax return
• •Resident aliens (based on the substantial presence test) filing a U.S. return
• •Spouses and dependents of U.S. citizens, resident aliens, or visa holders who are claimed on a return
• •Nonresident students, professors, and researchers filing a return or claiming a treaty benefit

3 Ways to Actually Submit Form W-7

Since faxing isn't an option, here are the submission routes the IRS actually accepts. In most cases your Form W-7 goes in together with the federal tax return that needs the ITIN, plus your identification documents.

Documents You Need for Form W-7

The IRS accepts 13 documents to prove identity and foreign status. Every document must be an original or a copy certified by the original issuing agency — meaning the issuing agency provides and certifies it as an exact copy and it carries the agency's official stamped seal. Notarized photocopies don't meet this standard. A valid passport is the only stand-alone document; anything else must be combined so you cover both identity and foreign status.

Dependents: most dependents must also prove U.S. residency, and a passport without a U.S. date of entry can't be their stand-alone document (limited exceptions apply, such as dependents of U.S. military stationed overseas and certain applicants from Canada or Mexico). Acceptable residency proof depends on age — U.S. medical or school records, a U.S. state ID or driver's license, a visa, or U.S. bank, utility, or rental statements. The full rules are in the Instructions for Form W-7 on irs.gov.

Do You File Form W-7 With a Tax Return?

Usually, yes. Form W-7 is generally attached to the U.S. federal tax return (such as Form 1040 or 1040-NR) that requires the ITIN, and the whole package — form, return, and documents — is submitted together. The Form W-7 instructions list a handful of exceptions where you can apply without a return by providing other documentation instead, such as certain passive income subject to third-party withholding, certain scholarship or fellowship income, home-mortgage interest reporting, and dispositions of U.S. real property by a foreign person. If you think an exception applies, confirm it in the official instructions before you apply.

How Long Does an ITIN Take?

Per irs.gov: allow 7 weeks for the IRS to notify you about your ITIN application status — and 9 to 11 weeks if you apply during peak processing (January 15 through April 30) or from overseas. The IRS answers by letter:

• •Notice CP565 — your ITIN was assigned (or renewed)
• •Notice CP566 — the IRS needs more information
• •Notice CP567 — the application was rejected

Does an ITIN Expire? Renewal Rules

Yes. Per the Form W-7 instructions, an ITIN expires if it wasn't included on at least one U.S. federal tax return for the last 3 consecutive tax years. If your ITIN has expired and you need to file a U.S. return, renew it before filing — the renewal uses the same Form W-7, the same document rules, and the same three submission routes described above. There's no fax shortcut for renewals either.

Mistakes That Delay ITIN Applications

• •Trying to fax or email the application — the IRS accepts neither for Form W-7
• •Sending plain photocopies or notarized copies instead of originals or issuing-agency-certified copies
• •Filing Form W-7 alone when it must be attached to the tax return that needs the ITIN
• •Mailing an irreplaceable passport when a designated TAC or a Certifying Acceptance Agent could verify it and hand it right back
• •Skipping U.S.-residency proof for a dependent whose passport has no U.S. date of entry

What You CAN Fax to the IRS Instead

Form W-7 is the exception, not the rule — plenty of IRS forms and case correspondence are accepted by fax. If the IRS has asked you to fax something, or you're filing one of these, faxing is often the fastest route:

• •Form 2848 (Power of Attorney) — see the IRS fax number for your state, commonly faxed to the IRS CAF unit
• •Form SS-4 (EIN application) fax filing — the business-ID cousin of the W-7
• •Responses to IRS notices, when the notice itself lists a fax number — always use the number printed on your notice
• •Browse the full list of IRS fax numbers by form or start at the IRS fax numbers hub

Form W-7 & ITIN FAQ

• Can I fax Form W-7 to the IRS?

  No. The IRS does not offer a fax option for Form W-7. Per irs.gov, ITIN applications are accepted by mail (Internal Revenue Service, Austin Service Center, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342), in person at IRS Taxpayer Assistance Centers, or through IRS-authorized Acceptance Agents — because the IRS must review your original identity documents or copies certified by the issuing agency, which cannot be done over fax.

• Where do I mail Form W-7?

  By U.S. Postal Service, mail Form W-7 with your tax return and documents to: Internal Revenue Service, Austin Service Center, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. If you use a private delivery service: Internal Revenue Service, ITIN Operation, Mail Stop 6090-AUSC, 3651 S. Interregional, Hwy 35, Austin, TX 78741-0000. Always verify the current address in the Form W-7 instructions on irs.gov before sending.

• How long does it take to get an ITIN?

  The IRS says to allow 7 weeks to be notified about your ITIN application status — 9 to 11 weeks if you apply during peak processing (January 15 through April 30) or from overseas. The IRS responds with notice CP565 (ITIN assigned), CP566 (more information needed), or CP567 (application rejected).

• Do I have to send my original passport to the IRS?

  Only if you apply by mail. A valid passport is the only stand-alone document that proves both identity and foreign status. To keep your passport, apply in person at a designated IRS Taxpayer Assistance Center (which verifies original documents and returns them immediately) or through a Certifying Acceptance Agent. The IRS also accepts copies certified by the original issuing agency with an official stamped seal.

• Can I apply for an ITIN without a tax return?

  Generally no — Form W-7 is normally attached to the U.S. federal tax return that needs the ITIN. The Form W-7 instructions list limited exceptions (for example, certain passive income subject to third-party withholding, certain scholarship income, mortgage interest reporting, and dispositions of U.S. real property) where you submit other documentation instead of a return. Check the exceptions in the instructions at irs.gov before applying without a return.

• Does an ITIN expire?

  Yes. Per the IRS, an ITIN expires if it wasn't included on at least one U.S. federal tax return for the last 3 consecutive tax years. If your ITIN has expired and you need to file a return, renew it by submitting Form W-7 again before you file.

• Can I file Form W-7 online?

  No. Irs.gov lists only mail, in-person, and Acceptance Agent options for ITIN applications — there is no online portal, no e-file option, and no fax option for Form W-7, because original or certified identification documents must be reviewed.

• What does an ITIN not do?

  Per irs.gov, an ITIN does not authorize you to work legally in the U.S., does not qualify you for Social Security benefits or the Earned Income Tax Credit, does not provide or change immigration status, and does not serve as identification outside the federal tax system. It is a 9-digit tax processing number only.