Do I file W-7 with my tax return?

Usually yes — W-7 is normally attached to the Form 1040 it'll be used for, mailed together to the ITIN Operations address in Austin, Texas. There are limited exceptions (treaty claims, third-party-withholding refunds) where W-7 stands alone.

What proof of identity do I send?

Original or IRS-certified copy of a passport (sole document that satisfies both identity and foreign-status) OR two other documents from the IRS-approved list (national ID, US visa, USCIS photo ID, etc.). Submitting originals via certified mail is standard; IRS returns them within 60 days.

How long until my ITIN arrives?

IRS processing varies seasonally — usually 7 weeks, up to 11 weeks during peak filing season. Plan filing accordingly if you have a refund tied to the ITIN.

ITIN vs. SSN — does it matter?

Yes. ITIN holders can't claim the EITC or some other credits SSN holders can. ITIN does NOT grant work authorization. It's strictly for tax-processing identity.

Tax · W-7

Fill out W-7 (ITIN application) online — free

Form W-7 is the IRS application for an Individual Taxpayer Identification Number — a 9-digit tax-processing ID issued to people who need to file US taxes but aren't eligible for a Social Security Number. Spouses and dependents of non-resident aliens, foreign investors, and certain visa holders all use W-7. AttachKit drafts the biographic block (name, DOB, country, foreign address) so the manual work narrows to the reason-for-applying checkbox.

The work happens in your browser — open DevTools → Network and watch: the file is never uploaded to do it.

Who needs it: Non-resident aliens filing US tax returns, US tax-treaty beneficiaries, dependents/spouses of US citizens or resident aliens, foreign investors with US-source income, and certain visa holders ineligible for an SSN.

Need a blank W-7? Download from the source, then drop it in below.

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Why fill it here

Draft name (Romanized + native), DOB, country of citizenship, foreign address, US address (if any), phone, and treaty country/article from your profile.
Manual selection for the reason-for-applying checkbox — the IRS rejects W-7 if multiple boxes are checked, so AttachKit deliberately leaves this for you.
Free to fill unlimited forms (10 signed PDFs/mo on the free tier).

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W-7 questions, answered

General information, not legal or tax advice

This page is general information about a commonly-used tax form. Tax law is complex and fact-specific — for advice on your return, consult a CPA, enrolled agent, or tax attorney. AttachKit fills the PDF; the IRS holds you responsible for what's on it.

Do I file W-7 with my tax return?: Usually yes — W-7 is normally attached to the Form 1040 it'll be used for, mailed together to the ITIN Operations address in Austin, Texas. There are limited exceptions (treaty claims, third-party-withholding refunds) where W-7 stands alone.
What proof of identity do I send?: Original or IRS-certified copy of a passport (sole document that satisfies both identity and foreign-status) OR two other documents from the IRS-approved list (national ID, US visa, USCIS photo ID, etc.). Submitting originals via certified mail is standard; IRS returns them within 60 days.
How long until my ITIN arrives?: IRS processing varies seasonally — usually 7 weeks, up to 11 weeks during peak filing season. Plan filing accordingly if you have a refund tied to the ITIN.
ITIN vs. SSN — does it matter?: Yes. ITIN holders can't claim the EITC or some other credits SSN holders can. ITIN does NOT grant work authorization. It's strictly for tax-processing identity.

More forms: Form 941 · Form 1040 · Form 2553 · Form 2848 · Form 4868 · Browse all 126 forms →

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AttachKit is a private, independent tool for filling and signing PDFs on your own device. It is not a government agency, law firm, or filing service, and is not affiliated with or endorsed by the IRS, USCIS, the U.S. Department of State, or any government body. Forms are provided for convenience — always download the current version and instructions from the official .gov website, and your completed document never leaves your browser.