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CP2000 Notice — Proposed Changes to Your Tax Return (Underreporter)

Direct answer

CP2000 proposes changes to your return because income or payments reported to the IRS do not match what you filed. You can agree, disagree with documentation, or ignore it — but ignoring can lead to a statutory notice of deficiency.

CP2000 is an exam notice, not a collection levy. The IRS is saying your return may be wrong based on documents it received — W-2s, 1099s, and other payor reports.

Reviewed August 2026 · Joseph Lancaster, Founder · About the author

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What CP2000 means

The IRS Automated Underreporter (AUR) program matched payor documents to your return and found a difference — usually unreported income or a mismatch in tax withheld. The notice shows proposed additional tax, penalties, and interest.

Your response options

  • Agree — sign and return the response form with payment if due.
  • Disagree — respond with documentation explaining the difference (corrected W-2, missing schedule, identity of payer, etc.).
  • Partial agreement — agree to some lines and dispute others with support.

Deadline matters

CP2000 includes a response deadline — typically 30 days from the notice date. If you do not respond, the IRS may issue a statutory Notice of Deficiency (CP3219A), which starts a 90-day Tax Court petition window.

Check transcripts and records

  • Compare the CP2000 line items to your return and supporting documents.
  • Request wage and income transcripts if you need to see what payors reported.
  • If you amended or filed late schedules, confirm whether the IRS processed them before issuing CP2000.

Common questions

Is CP2000 the same as an audit?

It is correspondence exam / AUR — not a full field audit. The IRS is proposing changes based on document matching, not necessarily an in-person examination.

What if I never received the income on CP2000?

Respond with documentation — identity theft affidavits, corrected 1099s from payors, or proof the income belongs to another taxpayer. Do not ignore the notice.

What happens if I ignore CP2000?

The IRS may issue CP3219A (Notice of Deficiency), assess the tax, and add penalties. You may lose the chance to dispute in Tax Court without paying first.

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