ITIN Number Lookup: 3 Ways to Find Your ITIN (2026)

How Do You Find Your ITIN on Your CP565 Notice?

The CP565 notice is the fastest ITIN lookup method. This official IRS letter was mailed when your ITIN was first assigned. It contains your full 9-digit ITIN in 9XX-XX-XXXX format printed near the top of the page.

Where to find your CP565

Check your filing cabinet, tax document folder, or wherever you store government correspondence. Many people file it with their first US tax return. The letter has the IRS letterhead and clearly displays both your ITIN and the assignment date.

Why this method is best

Zero phone calls, zero wait time. You locate the document and read the number. No identity verification required. This is the preferred approach for any ITIN number lookup.

How Do You Find Your ITIN on a Previous Tax Return?

Your ITIN appears at the top of every Form 1040 or Form 1040NR you filed, in the field labeled "Your identifying number." It starts with 9 and follows the 9XX-XX-XXXX format.

Where to find prior returns

Check paper copies in your tax folder. If you used a tax preparation service (TurboTax, H&R Block, or an independent CPA), log into their platform or contact them directly. Most services keep digital records for 3-7 years.

Requesting a tax transcript from the IRS

You can request a tax transcript from the IRS, though this takes time and requires a phone call. For full timeline details, see our guide on ITIN processing times.

How Do You Look Up Your ITIN by Calling the IRS?

Call 1-800-829-1040. An IRS agent confirms your ITIN after verifying your identity. You need:

• Full legal name (as on your W-7 application)
• Date of birth
• Mailing address currently on file with the IRS
• Any other identifying details the agent requests

IRS phone hours and international callers

Monday through Friday, 7:00 AM to 7:00 PM your local time. International callers: 1-267-941-1000. Call at 7:00 AM for shortest hold times. Avoid Mondays and post-holiday days.

Expected hold times by season

Which ITIN Lookup Method Is Fastest?

What If You Applied for an ITIN but Never Received It?

Some applicants submit Form W-7 and never receive a CP565 notice. The letter may have gone to an old address, been lost in mail, or the application may have been rejected.

Call the IRS to check application status

Call 1-800-829-1040 and explain the situation. The agent can tell you whether your application was approved, rejected, or still pending. If approved, they confirm the ITIN by phone. If rejected, they explain why.

Track through itin.so

If you applied through itin.so, you can check your ITIN application status through our tracking service. We provide WhatsApp updates at every stage: submitted, verified, processing, and assigned.

How Do You Request a Replacement CP565 Notice?

Step 1: Verify your address is current

If you moved since receiving your ITIN, update your address with the IRS first. File Form 8822 (Change of Address) or update during the call. Otherwise the replacement goes to your old address.

Step 2: Call and request

Call 1-800-829-1040, verify your identity, and request a replacement CP565. The agent confirms your ITIN verbally during the call, then mails a new letter.

Step 3: Wait 4-6 weeks

Replacement notices take 4 to 6 weeks. If you need your ITIN sooner, the verbal confirmation from the phone call is sufficient for most purposes. A Certifying Acceptance Agent can also help retrieve your information through direct IRS channels.

How Do You Protect Your ITIN During and After Lookup?

Only use official IRS phone numbers

The legitimate IRS number is 1-800-829-1040 (domestic) and 1-267-941-1000 (international). Any other number claiming to be the IRS ITIN line is fraudulent.

No legitimate online ITIN lookup exists

Any website claiming to offer an ITIN lookup database is a scam or data harvesting operation. The IRS does not share ITIN data with third parties under IRC Section 6103.

Secure storage after recovery

Save your ITIN in an encrypted password manager. Take a photo of your CP565 and store it separately. Having the number in 2 secure locations prevents future lookup needs.

Report suspected fraud

If you suspect someone has used your ITIN, contact the IRS Identity Protection Specialized Unit at 1-800-908-4490 and file Form 14039 (Identity Theft Affidavit).

What Should You Do After Finding Your ITIN?

Check if your ITIN is still active

ITINs expire after 3 consecutive years of non-use on a federal tax return. If you have not filed with your ITIN since 2022 or earlier, it needs renewal before the IRS will process returns.

File your tax return to reset the expiration clock

Using your ITIN on a federal return resets the 3-year expiration timer. File promptly to keep your ITIN active. See our Form 1040NR guide.

Renew if expired

If expired, submit Form W-7 with the renewal box checked. IRS processing takes 7-11 weeks. You can start your renewal through itin.so with our CAA-certified team. Standard $197, Express $297.