The IRS Letter 5071C does not include your SSN as this will be part of the verification process. To confirm your identity, I recommend using the website link listed below to complete your identity verification.
Per the IRS:
The 5071C letter is a legitimate letter from the IRS that provides instructions to verify that you submitted the tax return in question.
If you receive a 5071C letter, verify your identity on the IRS' secure Identity Verification Service website, idverify.irs.gov or call the toll-free number listed in your letter. You will be asked a series of questions to verify your identity. You will also be asked to confirm whether or not you filed the federal tax return in question.
You will need the following documents to verify your identity when you access the website or call:
- Your previous year's federal tax return
- Your current year's federal tax return, if you've already filed it
- Supporting documents from this year's federal tax return, such as Form W-2, Form 1099, and Schedules A and C
