Idaho State Tax Commission

Identity Verification Info

Verify Identity

Did you receive a letter to enter a PASSCODE or take a quiz?

The Tax Commission might need to verify your identity. This helps safeguard your information and keeps your refund from going to criminals.

You could receive one of three letters:

  • A passcode letter that asks you to enter a set of numbers we provided to confirm you filed the tax return we received
  • A quiz letter that asks questions to verify your identity
  • An ID verification letter that asks you to provide copies of documents
If you received one of these letters, we can't process your return or pay your refund until you respond.

Is this letter I received really from the Tax Commission?

Received a passcode letter?

Follow the instructions in the letter within 30 days of receiving it.

Received a quiz letter?

Only you can take the quiz.

Follow the instructions to take the quiz within 30 days of receiving the letter.

If you can't take the quiz, don't pass the quiz, or don't want to take it, you or your legal representative** can upload, mail, or bring the required documents to the Tax Commission.

** Your legal representative can be a legal guardian or someone you've given power of attorney to.

Received an ID verification letter asking for documents only?

Follow the instructions in the letter within 30 days of receiving it.

Required documents

Please don't provide original documents; we can't return them.

Send required documents:

  • If you got a quiz letter but didn't take or pass the quiz.
  • If you got the ID verification letter.

You must provide a copy from each of the following three categories below:

  1. A copy of the letter you received.
  2. A copy of your Social Security card or ITIN letter.
  3. A copy of a government-issued identification that has your full name.
    Examples include but aren't limited to:
    • Driver's license
    • Idaho identification card
    • Passport
    • Military identification
Contact the issuing agency (e.g. Social Security Administration, IRS) if you've lost the required government-issued identification.

Returning documents

You can upload, mail, or bring copies of documents to a Tax Commission office. We can't accept documents by email or fax.

Upload the documents

Upload copies securely online at You don't need a TAP account.

Mail the documents

Mail your identity verification letter, along with copies of the required documents, to:
Attn: Tax Discovery Bureau
Idaho State Tax Commission
PO Box 36
Boise, ID 83722-0410

We recommend you use registered or certified mail to track your documents and verify delivery.

Bring the documents to a Tax Commission office

Bring your identity verification letter, along with copies of the required documents, to one of our offices. See Office Hours and Locations

Page last updated June 22, 2021. Last full review of page: December 23, 2019.

This information is for general guidance only. Tax laws are complex and change regularly. We can't cover every circumstance in our guides. This guidance may not apply to your situation. Please contact us with any questions. We work to provide current and accurate information. But some information could have technical inaccuracies or typographical errors. If there's a conflict between current tax law and this information, current tax law will govern.