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Understanding your CP566 Notice

We need more information to process your application for an Individual Taxpayer Identification Number (ITIN). You may have sent us an incomplete form. You may have sent us the wrong documents.


Taxpayers and their representatives should review the latest ITIN information and Frequently Asked Questions, before requesting an ITIN.


What you must do

  • Go over the instructions for your application.
  • Make sure you don't qualify for a Social Security number (SSN) and you need an ITIN.
  • Go over your application to make sure you’ve answered all the questions.
  • Make sure your documents are correct.
  • Send us the documents we've asked for when you reply.
  • Make sure the documents are translated into English if we've requested a translation. Use a certified translator.
  • Complete and sign the response form at the end of your notice. Mail it to us with any documents we've requested.

You may want to

  • Contact us by calling the toll free number on your notice. Call 267-941-1000 (not a toll-free number) if you're outside the U.S. Obtain an ITIN from Abroad.
  • Visit a Taxpayer Assistance Center in the U.S..

Answers to Common Questions

What is an ITIN?
It is a number for you to use on federal tax documents.

Who needs an ITIN?
A non-citizen who has to file a federal tax return or a tax reporting document and does not qualify for an SSN needs an ITIN.

What is correct documentation?
In general, correct documentation is unexpired and has your photograph. It has the same name on it as on your application and tax return. It is from an organization authorized to issue it. The following documents can meet these conditions:

  • a passport
  • a visa (issued by the U.S. Department of State)
  • a civil birth certificate
  • a national, U.S. state, or military identification document
  • a U.S. or foreign driver’s license
  • a U.S. Citizenship and Immigration Services Photo ID
  • a foreign voter registration document or military card
  • U.S. school records (for dependents only)
  • U.S. medical records (for dependents only)

Foreign records must be from a country recognized by the U.S. State Department.

What are the special requirements for school and medical records?
They must be less than one year old. They must be for dependents younger than 18.

How much time do I have to reply?
You have 45 days from the date of your notice to reply.

What happens if I don't reply?
We will reject your application. You'll have to submit a new application for an ITIN.

Should I call you with my reply or mail it to you?
Mail your reply to us at the address on the notice.

What happens to my tax return if you reject my application?
We'll process your return without an ITIN. You'll need to reapply for an ITIN and attach a copy of the return to your application to get a refund.

I sent you documents when I applied for an ITIN. When will you return them?
We'll return your documents within 60 days after we've processed your application.

Whom can I talk to with my questions?
You can call the telephone number on the top right corner of the notice with your questions.


Tips for next year

Consider filing your taxes electronically. Filing online can help you avoid mistakes and find credits and deductions that you may qualify for. In many cases you can file for free. Learn more about e-file.

Page Last Reviewed or Updated: 16-Feb-2017

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