Last Updated on 20 hours ago by Hector Reyes
Updated for 2026
An ITIN (Individual Taxpayer Identification Number) is the tax ID that lets you file U.S. taxes, open a bank account, and start building credit — even without a Social Security Number. This guide walks through the exact application process, the documents that actually get accepted, and the specific mistakes that cause most rejections.
What Is an ITIN?
An ITIN is a 9-digit number issued by the IRS to people who need to file U.S. taxes but aren’t eligible for an SSN. It always begins with the number 9. Getting one doesn’t change your immigration status, doesn’t grant work authorization, and doesn’t entitle you to Social Security benefits — it exists strictly for tax administration.
Who Needs One
- Non-resident aliens required to file a U.S. tax return
- Resident aliens filing based on days present in the U.S.
- Spouses or dependents of a U.S. citizen or resident alien
- Spouses or dependents of a non-resident alien visa holder
Step 1: Get Form W-7
Download the current version free from irs.gov — always use the latest revision, since older versions get rejected. The form has eight labeled reason boxes (a through h); pick the one that matches your situation exactly, since choosing the wrong box is one of the most common rejection triggers.
Step 2: Gather the Right Documents
The IRS requires proof of identity and foreign status. A valid passport is the only document that covers both requirements by itself — everything else requires two separate documents. If you’re not using a passport, acceptable alternatives include:
- USCIS photo identification
- U.S. or foreign driver’s license
- National identification card (must show your name, photo, address, date of birth, and expiration date)
- Foreign military ID
- U.S. or foreign voter’s registration card
- Visa issued by the U.S. Department of State
Critical detail most guides skip: the IRS only accepts certified copies from the issuing agency, not notarized copies. Sending a notarized copy thinking it’s equivalent is one of the most common — and completely avoidable — reasons for rejection.
Step 3: Choose How to Submit
Option A — Mail it directly to the IRS.
Send your W-7, tax return (if required for your reason box), and certified supporting documents to:
Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342.
Free, but means mailing your original passport or a certified copy — many applicants aren’t comfortable with that, and processing takes 8–14 weeks.
Option B — Use a Certifying Acceptance Agent (CAA).
A CAA is an IRS-authorized professional who verifies your documents in person and returns your originals to you immediately, submitting certified copies to the IRS on your behalf. Typically costs $50–$200. This is the safest route if your passport is your only ID and you don’t want to part with it by mail.
Option C — Visit an IRS Taxpayer Assistance Center (TAC).
Free, in-person document verification. Requires an appointment, booked at irs.gov/help/contact-your-local-irs-office. You keep your original documents on the spot.
Step 4: Attach Your Tax Return (If Required)
Most reason boxes on Form W-7 require you to attach a signed paper tax return — you can’t e-file the return that travels with a first-time W-7, since the IRS has to assign your number before the return can be processed. Some exceptions exist (for example, certain treaty benefit claims), detailed in the Exceptions Tables in the official instructions.
Step 5: Wait for Processing
Standard processing takes about 7 weeks. During tax season (January 15–April 30) or if you’re applying from outside the U.S., expect 9–11 weeks. Applying in the fall, outside peak season, is consistently the fastest path.
The Most Common Rejection Reasons
- Name mismatch. Your name on the W-7 must match your passport exactly — middle names, accents, and order all matter.
- Notarized copies instead of certified copies. The IRS rejects notarized documents outright.
- Wrong reason box selected. Each box has specific documentation requirements attached to it.
- Missing tax return when your reason box requires one.
- Incomplete or inconsistent fields on the form itself — double-check every line before submitting.
Does an ITIN Expire?
Yes — and this catches a lot of people off guard. An ITIN expires if it hasn’t been used on a federal tax return for three consecutive tax years, expiring on December 31 of that third year. Any ITIN issued before 2013 has already expired regardless of recent use, if it was never renewed under the newer rules.
If you file with an expired ITIN, the IRS will still process your return but may deny certain tax credits until you renew — so check your ITIN’s status before filing season, not after.
How to Renew an Expired ITIN
Renewal uses the same Form W-7 — just check the renewal box instead of “new application.” You’ll still need current identification documents, but a tax return is only required if you’re filing one at the same time. Submit through the same three channels: mail, a CAA, or a TAC appointment.
Frequently Asked Questions
Does an ITIN affect my immigration status?
No. The IRS issues ITINs strictly for tax administration and does not use them to determine immigration status, and it doesn’t grant work authorization.
How long does it take to get an ITIN?
About 7 weeks under normal conditions, 9–11 weeks during tax season or for overseas applicants.
Can I use my ITIN to open a bank account before I get it approved?
No — you’ll need the approved ITIN itself for most bank and credit applications that specifically require one, though some banks accept just a passport for a basic account without any tax ID.
What happens if my ITIN application is rejected?
The IRS sends a notice explaining the issue. Most rejections stem from document type (notarized vs. certified) or a name mismatch — both are fixable by correcting the specific error and resubmitting.
Can I upgrade from an ITIN to an SSN later?
Yes. Once you become eligible for an SSN, you can notify the IRS, and your tax history under the ITIN transfers to your new number.
Written by the Hugo Reyes — based on current IRS Form W-7 instructions as of 2026. Processing times and requirements can change; always confirm the latest details at irs.gov/forms-pubs/about-form-w-7 before applying.
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