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 Letter 5747C

We need more information to verify your identity in order to process your tax return accurately. Unfortunately, we can’t verify your identity online or by phone. You must visit a Taxpayer Assistance Center (TAC). The contact information below is only for taxpayers who received Letter 5747C.

What you need to do

  • Call our Taxpayer Assistance Center toll-free line at 844-545-5640 within 30 days from the date of the letter to schedule an appointment to visit your local TAC. You must bring the information and identity documents listed on your letter to your appointment.
  • If you did not file a tax return, please call the toll-free IRS Identity Verification telephone number at 800-830-5084 between 7 a.m. and 7 p.m., local time, to tell us you did not file a tax return.

This contact information is only for taxpayers who received Letter 5747C. The letter applies to identity verification only. No other tax-related information, including refund status, is available.

Answers to common questions

What happens after my appointment?
We’ll continue processing your tax return once we verify your identity and confirm that you submitted the return. If you did file the return, please know it will take approximately 9 weeks to process it once you verify your identity.