I HAVE TO VERIFY MY IDENTITY
https://turbotax.intuit.com/tax-tips/security/tips-for-handling-identity-verification-requests-from-...
https://www.irs.gov/identity-theft-fraud-scams/identity-verification-for-irs-letter-recipients
The letter will explain the steps you need to take to confirm your identity and which tax return is in question, including the form and the year. For example, it might reference your Form 1040 for the 2020 tax year.
If you receive a 5071C letter, review it carefully and decide how you want to verify your identity. The IRS provides three options:
Online: Visit the IRS Identity Verification Service website. It will ask you to enter information and electronically verify your return. https://www.irs.gov/identity-theft-fraud-scams/identity-verification-for-irs-letter-recipients
By phone: If you prefer to resolve the issue over the phone, call the number listed on your 5071C letter.
In person: If the IRS can't verify your identity by phone or online, you may be asked to make an appointment with your local IRS office.2 You should attempt to verify online or by phone first.
What You'll Need to Confirm Your Identity:
You'll need several items on hand when you contact the IRS. They include:
Your 5071C letter
The tax return referenced in the letter
A previous year's tax return
The supporting documents associated with both tax returns (W-2s, 1099s, etc.)
If you're verifying online, you'll also need:
Your cell phone number
The mailing address from your previous year's tax return
Your personal account number from an auto loan, credit card, mortgage, home equity loan or line of credit, or student loan
The IRS says to allow up to 9 weeks after you verified your identity. It may not take that long, but that's what the website says for 4883C and 5071C letters, assuming you received one of those.
