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CP2000 notice: what it means and how to respond

A CP2000 says the income or payment information the IRS received from employers, banks or others doesn't match your return. It isn't a bill. Check it, then agree or disagree by the date on the notice, usually 30 days.

What to do, step by step

  1. Read the whole notice. It lists the income or payments the IRS received that don't match your return and the change it proposes.
  2. Check it against your records: W-2s, 1099s, 1098s and your copy of the return. Payment apps and online marketplaces also send 1099s.
  3. Respond by the date on the notice. The IRS says 30 days from the notice date, or 60 days if you live outside the U.S. Complete and sign the response form; on a joint return both spouses sign.
  4. Agree or disagree. If you agree, follow the instructions; you don't need to amend. If you disagree with some or all of it, say so and include a signed explanation and supporting documents.
  5. Pay or set up a payment plan if you owe. Paying the proposed amount within 30 days stops additional interest and possibly penalties.

How to reply

  • Upload: the fastest way. Use the IRS document upload tool with the access code printed on your notice.
  • Fax: to the number for the IRS office shown at the top left of your notice.
  • Mail: to the address on the top left of the first page of the notice.

Need more time? Send an extension request with your reply. Want someone to handle it? A tax professional can, with Form 2848, or you can authorize someone on the response form.

Common causes

  • A W-2 or 1099 you didn't include, often from a second job, a side gig, a payment app or interest on a savings account.
  • Tips missing from your return. Unreported tips go on Form 4137.
  • A corrected form that arrived after you filed.

Check earlier years too: if they have the same issue, file an amended return for them. For next year, wait until all your income documents arrive before filing.

Common questions

Is a CP2000 an audit? It isn't a bill or a field audit. It's a notice that income or payment information the IRS received from employers, banks or others doesn't match your return, and it proposes changes. You can agree or disagree.

How long do I have to respond to a CP2000? Respond by the date on the notice. The IRS says to respond within 30 days of the notice date, or 60 days if you live outside the United States. You can ask for more time.

What happens if I ignore a CP2000? If the IRS doesn't hear from you by the response date, it sends a Statutory Notice of Deficiency, and interest keeps growing until the balance is paid.

Do I need to file an amended return? Not if you agree and have nothing else to report; follow the notice's instructions. If you agree but have other income, credits or expenses to report, file Form 1040-X, write "CP2000" at the top and send it with your response form.

Can the CP2000 lower my tax? Yes. The IRS says the difference may increase or decrease your tax, or not change it at all.

Updated November 5, 2026. Sources: IRS, "Understanding your CP2000 series notice" (reviewed July 14, 2026); IRS Topic no. 652, Notice of underreported income.