What is the fastest way to find my ITIN number?

Checking your CP565 ITIN assignment letter is the fastest method - the ITIN is printed at the top of the page. If you have a past federal tax return (Form 1040 or 1040-NR), the ITIN appears on the taxpayer or dependent line. If neither is available, ordering an IRS account transcript through IRS.gov is the next fastest (instant once ID.me verification is complete).

Can someone else look up my ITIN for me?

Not without a valid power of attorney filed with the IRS. Form 2848 (Power of Attorney and Declaration of Representative) authorizes a tax professional to discuss your account, including the ITIN. Without Form 2848 on file, the IRS will not disclose the ITIN to anyone other than the taxpayer named on the account.

Can I call the IRS to retrieve my ITIN by phone?

Yes. Call 1-800-829-1040 (individual taxpayer line) or the IRS ITIN unit at 1-800-908-9982. Have your name, date of birth, current address, country of citizenship, and prior return data ready for identity verification. The agent will state the ITIN verbally and can mail written confirmation to the address on file.

How do I order an IRS transcript to find my ITIN?

Go to IRS.gov, choose "Get Your Tax Record," sign in or create an ID.me account, and request an Account Transcript. The transcript displays the ITIN at the top. ID.me verification requires a government-issued photo ID; foreign passports sometimes fail this step, in which case use Form 4506-T by mail or the phone method instead.

What if I have no documents and never filed a US return?

Call the IRS at 1-800-829-1040 and request identity verification. The IRS uses identifying questions tied to your application records (date of birth, country of citizenship, address you used on Form W-7, document type used to apply). If verification succeeds the agent will release the ITIN; if it fails you may need to file a new Form W-7 to receive a fresh CP565.

Updated June 25, 2026

How to Look Up Your ITIN Number: 3 Methods That Work in 2026

Why Does No Public ITIN Number Lookup Tool Exist?

ITINs are protected taxpayer information under section 6103 of the Internal Revenue Code. The IRS cannot publish, sell, or expose ITINs through any search interface. This is the same standard applied to SSNs. Any site claiming to look up an ITIN by name, date of birth, or email is either fraudulent or simply repackaging the IRS-approved methods for a fee.

For the canonical reference on lookup, see the ITIN number lookup page.

What Is Method 1: Checking Your CP565 Letter or Prior Returns?

The IRS mailed a CP565 ITIN Assignment Notice when your ITIN was issued. The notice displays the ITIN at the top alongside your full name. If you kept the CP565, this is the fastest method (0 seconds, no verification required).

If the CP565 is lost, any past federal tax return where you used the ITIN works equally well. Form 1040, 1040-NR, 1040-X, and 1040-SR all display the ITIN on the taxpayer or dependent line. Check both the primary taxpayer field and dependent fields if you were claimed as a dependent.

What Is Method 2: IRS Account Transcript on IRS.gov?

Go to IRS.gov and select "Get Your Tax Record."
Sign in or create an ID.me account. ITIN holders use a passport as the government-issued photo ID.
After verification, choose "Account Transcript" for the most recent year you filed.
The transcript header lists your ITIN. Download the PDF.
If ID.me verification fails, fall back to Form 4506-T by mail (10 business days) or Method 3 below.

What Is Method 3: Calling the IRS for Verification?

Call 1-800-829-1040 Monday through Friday, 7am to 7pm local time, or the IRS ITIN unit at 1-800-908-9982. International callers without a US phone line use +1-267-941-1000 (not toll-free).

Have ready: full legal name as filed on Form W-7, current mailing address, country of citizenship, date of birth, and identifying information from a prior return (filing status, AGI, refund amount). The agent runs identity verification before disclosing the ITIN. Expect 30 to 60 minutes including hold time.

The agent can mail written confirmation to the address on file at no charge. Allow 2 to 4 weeks for the letter.

What Should You Do If All 3 Methods Fail?

If you cannot verify identity by phone, cannot pass ID.me, and have no CP565 or prior return, submit a new Form W-7 marked as a renewal. The IRS will look up your prior ITIN by the documents and biographical data on the new W-7 and re-issue the same number on a fresh CP565. Allow 7 to 11 weeks for processing.

For step-by-step new application guidance, see the how to get an ITIN guide.

Which Websites Falsely Claim to Offer ITIN Lookup?

Sites that advertise "ITIN database lookup," "TIN search by name," or "ITIN verification by email" are either fraudulent data brokers or paid intermediaries that simply walk you through the IRS phone process. The only legitimate disclosure channel is the IRS itself. Never enter your SSN, passport details, or banking information into a third-party "lookup" tool.

Frequently Asked Questions About ITIN Number Lookup

No. The IRS does not provide a public ITIN lookup database. ITINs are confidential under section 6103 of the Internal Revenue Code and can only be disclosed to the taxpayer who owns the number. Any third-party website claiming to offer ITIN lookup is either fraudulent or charging for a service that simply walks you through the IRS-approved methods.

Need a brand new ITIN? Apply with a Certifying Acceptance Agent — $297 flat, ready in 7 days.