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4883C

Identity Verification - Potential Theft

Complete guide for tax professionals on responding to IRS 4883C notices, including deadlines, required documentation, and response strategies.

Response Deadline

30 days

IRS: 1-800-829-1040View on IRS.gov

What Triggers This IRS Notice

  • 1IRS suspects identity theft may have occurred
  • 2Return shows signs of fraudulent filing
  • 3Multiple returns filed under same SSN

What the IRS Is Claiming

  • A return was filed that may not be yours
  • Identity verification is required
  • You must verify in person or by phone (no online option)

Key Deadlines and Response Timelines

You must verify your identity within 30 days. Unlike 5071C, online verification is NOT available for this notice.

What Happens If You Do Not Respond

  • Return will not be processed
  • Refund will not be issued
  • Identity theft flag will remain on account

Documentation Commonly Required

The 4883C letter
Government-issued photo ID
Copy of tax return in question
Documents to verify income (W-2s, 1099s)

When IRS Information Is Incorrect

  • 1
    If you didn't file: report identity theft
  • 2
    File Form 14039 immediately
  • 3
    Request IP PIN for future protection

How Tax Professionals Typically Respond

  1. 1

    Call the number on the letter - online is not available

  2. 2

    Visit local IRS office with all documentation

  3. 3

    If fraudulent: file Form 14039 and police report

  4. 4

    Request Identity Protection PIN going forward

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