Background

The IRS sends identity verification letters when its systems detect something unusual—duplicate Social Security numbers, mismatched income reporting, or signs of possible identity theft. These notices are a defensive measure to confirm the taxpayer on file is the rightful filer (IRS: Identity Theft and Your Tax Records, https://www.irs.gov/identity-theft-fraud-warnings/identity-theft-affects-your-tax-records).

Immediate steps to take (first 48–72 hours)

  • Read the letter carefully. Note the deadline, the notice code (many start with “CP” or “LT”), and the instructions for response.
  • Don’t panic or ignore it. Failing to respond can delay refunds or tax processing.
  • Verify authenticity before sharing personal data. The IRS will generally first contact taxpayers by mail—not by email or unsolicited phone call—so treat unexpected calls or emails as likely scams (IRS: How the IRS Contacts Taxpayers, https://www.irs.gov/newsroom/irs-identity-theft-protection-tip).

How to verify the letter is real

What the IRS may ask you to do

  • Call the IRS Identity Verification number listed on the letter and answer questions.
  • Visit the IRS Identity Verification Service online (if directed) and complete the steps.
  • Mail or upload copies of identity documents: government photo ID, Social Security card, prior-year tax return, W-2s or 1099s showing income, or other proof of residency and identity.

Documents commonly accepted

  • Government-issued photo ID (driver’s license or passport)
  • Social Security card or a SSA letter
  • Prior-year federal tax return and supporting W-2/1099 forms
  • Bank statements or utility bills that show your name and address

If you suspect identity theft

  • Follow the IRS identity-theft instructions and, if instructed, complete IRS Form 14039 (Identity Theft Affidavit) when a return was filed fraudulently in your name (see IRS guidance above).
  • Place fraud alerts or credit freezes with the three major credit bureaus and review your credit reports at AnnualCreditReport.com.
  • Consider applying for an IRS Identity Protection PIN (IP PIN) to prevent future fraudulent filings (see our guide on IP PINs: Navigating IRS Identity Protection PINs (IP PIN): Why and How to Use One: https://finhelp.io/glossary/navigating-irs-identity-protection-pins-ip-pin-why-and-how-to-use-one/).

Timelines and realistic expectations

  • Response windows vary by notice. Respond by the date shown to avoid processing delays.
  • After you provide verification, the IRS can take several weeks to clear and process your return—processing times are longer during filing season.

Common mistakes to avoid

  • Don’t provide personal information in response to unsolicited emails or texts. The IRS will not initiate identity verification through email.
  • Don’t assume a phone call is legitimate—verify numbers and match them to the printed notice or the IRS site.
  • Avoid over-sharing documents. Send only requested documents and follow secure methods (mail to the address on the notice or the IRS secure upload link if provided).

When to get professional help

  • If the case involves identity theft, multiple years, or suspected fraudulent returns, consult a tax professional or an identity-theft specialist. In my experience working with taxpayers, timely documentation and organized records shorten resolution time.

Helpful resources and internal links

Quick checklist to send with your response

  • Copy of the identity verification letter (if mailing)
  • Government photo ID (copy)
  • SSN documentation if requested (copy of card or SSA statement)
  • Prior-year return and W-2/1099 that support income claims
  • A cover letter listing the documents included and your contact information

Disclaimer

This article is educational and does not replace personalized tax advice. For complex situations—especially identity theft—consult a tax professional or contact the IRS directly using numbers from the official IRS website.

Authoritative sources