ITIN Application Timeline: How Long It Really Takes in 2026

An Individual Taxpayer Identification Number (ITIN) is the IRS-issued number for people who must file a U.S. tax return but cannot get an SSN. The official IRS target is 7 weeks. The reality in 2026 is 8-14 weeks - and roughly 25% of self-filed applications are rejected. Here is what shortens it.

Three filing routes, real timing

• Mail Form W-7 with original passport: 8-14 weeks. You will be without your passport during that window.
• In-person at an IRS Taxpayer Assistance Center: 7-10 weeks. Appointment required, limited locations.
• Through a Certified Acceptance Agent (CAA): 6-8 weeks. CAA verifies your passport in person and you keep it.

Why applications get rejected

• No attached U.S. tax return when one was required (most common rejection).
• Foreign address mismatch between W-7 and tax return.
• Passport copy not certified by the issuing country.
• Wrong reason code on line a-h of the W-7.
• Treaty exception claimed without supporting documentation.

When you can apply without a tax return

You can apply standalone if you are claiming a tax treaty benefit (e.g. reduced withholding on royalties or capital gains), receiving certain U.S. partnership distributions, or opening a U.S. brokerage account that requires an ITIN. Most other applications must be attached to a Form 1040 or 1040-NR.

Pair the ITIN with the right tax filing

If you are a foreign founder of a U.S. entity, you typically need both an EIN for the company and an ITIN for personal filings. We run both tracks in parallel and prepare the underlying international tax return so nothing is rejected for a missing attachment.

Get a same-week appointment

Our CAA team books W-7 appointments within 5 business days. Book here.