Why you got an IRS CP2000
- A 1099 (NEC, MISC, INT, DIV, B, K) wasn't reported on your return.
- Stock-sale proceeds reported on Form 1099-B were included without the cost basis.
- A W-2 from a job you forgot about was reported by the employer.
- Retirement distributions, gambling winnings, or cryptocurrency transactions were under- or unreported.
What happens if you ignore this notice
If you don't respond, the IRS will assess additional taxes, penalties, and interest automatically.
How to respond to a CP2000
Recommended completion window: within 30 days of the notice date
- 1
Read the entire notice
Each line shows what the IRS received, what you reported, and the proposed change. Pages later in the notice show the recalculation.
- 2
Match to your records
Pull your bank statements, brokerage 1099s, and tax return. Common fixes: missing cost basis on stock sales, double-reported income, or income on the wrong return year.
- 3
Check the response form
If you agree, sign the response form and pay. If you disagree, check the disagree box and attach an explanation with supporting documents.
- 4
If partial — agree to what's correct and dispute the rest
Be specific: line item, IRS amount, your amount, why. Include 1099 copies, brokerage statements, or amended W-2s.
- 5
Submit before the 30-day deadline
Mail certified with return receipt or fax to the number on the notice. Keep proof of delivery.
Common mistakes with a CP2000
- Treating CP2000 as a final bill and paying without verifying.
- Filing an amended return (Form 1040-X) instead of responding directly — this complicates the case.
- Ignoring the notice — the IRS issues a Statutory Notice of Deficiency next, with only 90 days to petition Tax Court.
IRS forms referenced
Form 9465
Installment Agreement Request
View form details
Frequently asked questions about CP2000
Is a CP2000 an audit?
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No. CP2000 is a document-matching notice. It compares third-party information returns (W-2s, 1099s) to your filed return. An audit (Letter 525, Letter 2205) is a broader examination of your return's items.
What if I agree with the CP2000?
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Sign and return the response form, then pay the balance. If you can't pay in full, you can request an installment agreement at the same time using Form 9465.
How do I dispute a CP2000?
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Check the 'disagree' box on the response form, attach a written explanation with supporting documents (1099s, brokerage statements, corrected W-2s), and mail or fax it back before the 30-day deadline.
What happens if I ignore a CP2000?
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The IRS issues a Statutory Notice of Deficiency (90-Day Letter). After 90 days the proposed change becomes a final assessment, and you must pay first and sue for a refund — or petition Tax Court within the 90 days to challenge before paying.
Reviewed by Franklin Sofi, MBA, CPA, CTRS — Founder & Tax Resolution Specialist at Comprehensive Tax Resolution. Last reviewed November 2025.
This page is general information, not legal or tax advice. For specific guidance on your IRS notice, contact a qualified CPA or tax resolution specialist.