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An IRS Proof of Identity letter tells you the IRS needs to confirm you are the taxpayer who filed a return. The most common notice is Letter 5071C (Identity Verification), which asks you to verify either online or by mail. Acting quickly and following the letter’s instructions is the fastest way to get your refund processed and avoid added scrutiny (IRS: Identity Verification — Verify Your Identity: https://www.irs.gov/identity-theft-fraud-scams/identity-verification-verify-your-identity).

Step-by-step response (practical checklist)

  1. Read the letter carefully
  • Note the letter number, the deadline, and whether it directs you to verify online, by phone, or by mail. Deadlines are commonly 30 days but check your specific notice.
  1. Verify online first (fastest when available)
  1. If you must mail documents
  • Only send what the letter requests. Typical acceptable items: Social Security card or SSA statement, U.S. passport, state driver’s license or ID, birth certificate, recent W-2 or 1099 matching the return, and a copy of the tax return in question.
  • Send copies, not originals, unless the letter explicitly asks for originals.
  • Include a photocopy of the IRS letter and a short cover note stating your taxpayer name, SSN (or last 4 digits if instructed), and the date.
  • Use certified mail or another tracked delivery method so you have proof of receipt.
  1. If you suspect identity theft
  • Complete and submit IRS Form 14039 (Identity Theft Affidavit) if directed or if someone filed a return using your SSN (IRS Form 14039: https://www.irs.gov/forms-pubs/about-form-14039).
  • Create an account and request an IP PIN (Identity Protection PIN) at IRS.gov if you are an identity-theft victim; this prevents others from filing using your SSN.
  • Report the crime and get a recovery plan via IdentityTheft.gov (FTC) for credit freezes, fraud alerts, and other steps.
  1. Follow up and keep records
  • Keep copies of everything you send and a written log of phone calls (date, time, name, and ID number of the agent).
  • Expect processing time: online confirmations are immediate; mailed documents can take weeks. If the IRS still does not resolve your case within the timeframe noted in the letter, call the number on the notice.

Common documents the IRS accepts (examples)

  • Government-issued photo ID (driver’s license, state ID, passport)
  • Social Security card or SSA verification letter
  • Birth certificate or U.S. naturalization certificate
  • Recent tax return, W-2, 1099, or pay stubs
  • Utility bill or bank statement showing your name and address (when address confirmation is needed)

Timeline expectations

  • Immediate: Online verification, if successful.
  • 2–8 weeks: Typical processing for mailed documentation; delays can occur during busy filing seasons.
  • Months: If identity theft is confirmed, full recovery and refund issuance can take several months while the IRS completes its investigation.

If you miss the deadline

  • The IRS may delay processing your return or hold your refund until they can verify your identity. In some cases, they may require additional steps such as filing Form 14039 or visiting an IRS Taxpayer Assistance Center.

Professional tips

  • Respond exactly as the notice directs; do not use a general IRS address unless instructed.
  • Never provide original documents unless the letter explicitly demands them.
  • Use tracked mail and keep receipts.
  • When in doubt, get help from a qualified tax professional, enrolled agent, or tax attorney if the matter is complex or you suspect fraud.

Relevant FinHelp resources

Authoritative sources

Professional disclaimer

This article is educational and does not replace personalized tax or legal advice. For help with your specific notice, contact a qualified tax professional or the IRS directly using the phone number on your notice.