Information For...

For you and your family
Standard mileage and other information

Forms and Instructions

Individual Tax Return
Instructions for Form 1040
Request for Taxpayer Identification Number (TIN) and Certification
Request for Transcript of Tax Return


Employee's Withholding Allowance Certificate
Employer's Quarterly Federal Tax Return
Employers engaged in a trade or business who pay compensation
Installment Agreement Request

Popular For Tax Pros

Amend/Fix Return
Apply for Power of Attorney
Apply for an ITIN
Rules Governing Practice before IRS

Understanding Your CP01 Notice

We verified your claim of identity theft and have placed an indicator on your account. We’ll monitor your tax account for activity to help prevent future fraud.

What you need to do

We don’t require any additional actions on your part. Please continue to file your tax returns timely.

You may want to

Answers to common questions

What effect does the Identity Theft Indicator have on my account?

The indicator has no effect on your ability to file your tax return, make payments, or receive a refund.

What happens if someone else uses my SSN to file a fraudulent tax return?

The indicator we placed on your account will alert us to perform research to make sure a tax return filed with your SSN is valid. If we find the tax return to be invalid, we won't process it.

How long does the indicator remain on my account?

The indicator will remain on your tax account to protect it because you were a victim of identity theft, unless you specifically request that we remove it.

Who should I contact if I have more questions about my account related to identity theft?

Call 800-908-4490 for specialized assistance regarding identity theft related to your account. You can also find the number on your notice. For all other tax account related questions, contact the IRS help desk at 800-829-1040.

Where can I find more information on preventing identity theft?

Tips for next year

File your return as you normally would. If we find someone attempting to use your SSN to file a tax return, we’ll notify you and provide you with an identity protection personal identification number (IP PIN) to use when filing your return.

Printable samples of this notice (PDF)

How to get help