ITIN Number Lookup: 3 Ways to Find Your ITIN (2026)
Written by
itin.so Editorial Team
IRS-Authorized Certifying Acceptance Agents
3 ways to look up your ITIN number:
- Check your CP565 notice (the IRS approval letter) - instant
- Review a prior tax return (Form 1040/1040NR) - minutes
- Call the IRS at 1-800-829-1040 (verify identity by phone) - 15-60+ min hold
The IRS does not offer an online ITIN lookup tool. These are your only 3 options. Your ITIN information is protected under IRC Section 6103 taxpayer confidentiality rules.
Misplacing your ITIN does not mean it is lost for good, because the IRS keeps it permanently on record. There is no online lookup tool, but you can recover your number three reliable ways: read your CP565 approval notice, check a previously filed tax return, or call the IRS to verify your identity by phone. This guide walks through each method, compares how fast they are, and explains what to do if you never received your notice. It also covers requesting a replacement CP565 and protecting your number from lookup scams.
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. If you never had one, you can get your ITIN through our CAA-certified service.
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.
Storage tip: Take a photo of your CP565 and save it in an encrypted password manager or notes app. This prevents future lookup problems if the paper copy is lost or damaged. Having 2 backup copies (digital + photocopy) is the gold standard.
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
- January-April (tax season): 60+ minute holds are common
- May-September: 15-30 minute holds typical
- October-December: 20-45 minute holds typical
- Best days: Tuesday through Thursday, early morning
Which ITIN Lookup Method Is Fastest?
| Method | Speed | Difficulty | What You Need |
|---|---|---|---|
| CP565 Notice | Instant | Easy | The original IRS approval letter |
| Prior Tax Return | Minutes | Easy | Any filed Form 1040/1040NR |
| Call IRS (1-800-829-1040) | 15 min to 1+ hour | Moderate | Name, DOB, address on file |
Need a new ITIN or renewal?
If your ITIN expired or you never received one, we handle the full W-7 application. Standard $197, Express $297.
Start Your ITIN ApplicationWhat 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 6-11 weeks. You can start your renewal through itin.so with our CAA-certified team. Standard $197, Express $297.
Skip the IRS hold times
Apply through itin.so and get WhatsApp updates at every step. No phone calls, no guessing.
Apply for Your ITIN NowITIN Number Lookup: Frequently Asked Questions
Can I look up my ITIN number online?
What is a CP565 notice and where do I find it?
How do I find my ITIN on a previous tax return?
What number do I call to look up my ITIN?
How long does it take to get my ITIN over the phone from the IRS?
What if I never received my CP565 notice?
Can someone else look up my ITIN for me?
Does my ITIN expire if I have not used it in several years?
Is there a fee to look up my ITIN through the IRS?
How do I protect my ITIN when looking it up?
Written by
itin.so Editorial Team
IRS-Authorized Certifying Acceptance Agents
The itin.so editorial team is made up of IRS-authorized Certifying Acceptance Agent (CAA) professionals who have helped applicants from 150+ countries secure their ITINs. Every guide is sourced from official IRS publications, forms, and instructions, then reviewed for accuracy before publishing.