Quick answer: File Form W-7 along with the federal tax return that requires it. Standard IRS processing takes 7-11 weeks (up to 14 weeks during tax season, January-April). The fastest and safest route is applying through a Certifying Acceptance Agent (CAA), since they verify your passport in person and return it to you immediately — instead of mailing your original passport to the IRS and waiting up to 60 days to get it back.
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What Is an ITIN and Who Needs One?
An Individual Taxpayer Identification Number (ITIN) is a nine-digit number issued by the IRS to individuals who must file US taxes but aren’t eligible for a Social Security Number. It always begins with the digit 9. You typically need one if you’re a nonresident or resident alien filing a US tax return, a spouse or dependent of a US taxpayer, or someone claiming tax treaty benefits — regardless of immigration status. Importantly, an ITIN is strictly for tax purposes — it does not authorize you to work in the US or change your immigration status.
Step-by-Step: How to Apply for an ITIN
- Complete Form W-7. Fill it out accurately, including your full legal name exactly as it appears on your identity documents.
- Attach your federal tax return (Form 1040 or 1040-NR), unless you qualify for a specific exception, such as a tax treaty claim.
- Gather your identity documents. A current passport is the only document that proves both identity and foreign status on its own. Without one, you’ll need a combination of at least two other approved documents.
- Choose how to submit — by mail directly to the IRS, through a Certifying Acceptance Agent, or in person at an IRS Taxpayer Assistance Center.
- Wait for processing — 7-11 weeks under normal conditions, longer during tax season or if applying from overseas.
Three Ways to Apply — Compared
| Method | Best For | Do You Mail Your Passport? | Cost |
|---|---|---|---|
| Mail Directly to the IRS | Applicants comfortable being without their passport for weeks | Yes — original or certified copy required | Free (IRS charges no fee) |
| Certifying Acceptance Agent (CAA) | Keeping your passport while you apply | No — verified in person, returned immediately | Service fee, typically $299-$699 |
| IRS Taxpayer Assistance Center (TAC) | Free in-person verification, by appointment | No — verified on-site, returned immediately | Free |
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Why Using a CAA Is Usually the Fastest, Safest Route
Mailing your original passport to the IRS’s Austin Service Center means going without it for up to 60 days — a real problem if you need it for travel, work, or banking in the meantime. A Certifying Acceptance Agent verifies your identity documents in person, attaches a Certificate of Accuracy to your application, and returns your passport to you immediately. The IRS’s own processing time doesn’t change, but you avoid the risk of a lost or delayed passport entirely — which is why most tax professionals recommend this route whenever a CAA is accessible near you.
Common Mistakes That Delay Your ITIN
- Missing or expired documents — your passport must be valid at the time of submission.
- No tax return attached when one is required, or failing to properly document a valid exception.
- Incomplete or unsigned Form W-7.
- Name mismatches between your form and your identity documents.
- Applying during peak season (January-April) without buffering extra time into your plans.
Frequently Asked Questions
How long does it take to get an ITIN?
Standard processing takes 7-11 weeks, extending to 9-14 weeks during peak tax season (January 15-April 30) or for applications submitted from overseas.
Do I have to attach a tax return to Form W-7?
In most cases, yes. Exceptions exist for specific situations, such as tax treaty claims or certain scholarship reporting, which require their own supporting documentation instead.
Can I avoid mailing my original passport to the IRS?
Yes — apply through a Certifying Acceptance Agent or an IRS Taxpayer Assistance Center, both of which verify your documents in person and return them to you immediately.
Does an ITIN expire?
Yes. ITINs that haven’t been used on a federal tax return for three consecutive years expire and must be renewed using the same Form W-7 process.
Can an ITIN help me build US credit?
Yes. Many secured credit cards, credit-builder loans, and some banks accept an ITIN in place of a Social Security Number, making it a foundational step for building a US credit file.
Disclaimer
This article is for informational and educational purposes only and does not constitute tax or legal advice. IRS forms, processing times, and requirements are subject to change — always verify current requirements directly on IRS.gov before applying. We are not a tax preparer, CPA, or Certifying Acceptance Agent. Consult a licensed tax professional or an IRS-authorized Acceptance Agent regarding your specific situation.
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