An IRS CP2000 notice means the income reported to the IRS by employers, banks, and brokers doesn’t match your tax return — and the IRS is proposing a change, usually more tax. It is not a bill and not an audit. You have 30 days from the notice date to respond using the enclosed response form: agree, partially agree, or disagree with documentation. Ignore it, and the proposed amount becomes a legal assessment.
Why did you get a CP2000?
The Automated Underreporter (AUR) system matches every W-2 and 1099 against your return, often a year or more after filing. Common triggers:
- A 1099-NEC or 1099-K for side income you forgot or netted against expenses without a Schedule C
- Brokerage sales (1099-B) where the IRS saw gross proceeds but not your cost basis — the classic inflated CP2000, proposing tax on the entire sale amount
- Retirement distributions (1099-R), including rollovers the IRS couldn’t tell were non-taxable
- A W-2 from a short job that never made it onto the return
- Crypto exchange forms reporting proceeds without basis
The proposed tax often overstates what you owe, because the IRS computes it with zero basis, zero deductions, and no offsetting expenses. That’s why "partially agree" is the most common correct answer.
How do you respond if you agree?
If the IRS is simply right — you missed the income and the math holds:
- Check the agreement box on the response form and sign (both spouses for joint returns).
- Pay what you can with the response, or set up a payment plan — installment agreements are available for CP2000 balances like any other tax debt.
- Do not file an amended return (1040-X) for the items in the notice — the CP2000 process handles the adjustment itself. Amending on top of it creates duplicate processing.
Interest applies automatically. If the notice includes a 20% accuracy-related penalty, you can ask for relief — and if your compliance history is clean, first-time penalty abatement may wipe the penalty even when the tax stands.
How do you respond if you disagree (fully or partly)?
Check the disagree (or partial) box and attach a signed explanation plus documents:
- Missing basis: send the brokerage statement or transaction history showing purchase cost — this alone can turn a five-figure proposal into a few hundred dollars or zero.
- Income isn’t yours or is wrong: include the corrected 1099 from the issuer, or a statement from them acknowledging the error. If identity theft produced the form, say so and attach Form 14039 if applicable.
- Already reported it: point to the exact line/schedule where the income appears — mismatches often come from reporting income on a different line than the IRS expected.
- Deductible offsets: for 1099-NEC/K income, a completed Schedule C with expenses shows the correct net.
Respond by mail (keep copies, use certified mail), by fax to the number on the notice, or through the IRS document upload tool if your notice offers it. Ask for appeal rights in your response so a rejection can go to the IRS Independent Office of Appeals rather than straight to assessment. If you can’t gather documents in 30 days, call the number on the notice and request an extension — AUR routinely grants more time when asked before the deadline.
What happens if you don’t respond?
The IRS issues a CP3219A Statutory Notice of Deficiency. That’s the formal 90-day letter: your last chance to contest without paying first, by petitioning the U.S. Tax Court within 90 days. After that, the tax assesses, collection notices begin, and your options shift to payment plans, offer in compromise, or paying and suing for refund. Everything is easier and cheaper at the CP2000 stage — respond even if your answer is just a request for more time.
FAQ
Is a CP2000 an audit?
No — it’s a document-matching proposal, narrower than an audit. But the response deadline is just as real.
Will responding trigger an audit?
Responding with clear documentation typically closes the case. Non-response and escalation attract more attention than a clean reply.
The notice covers a year I already amended. What now?
Send a copy of the processed 1040-X with your response and explain the overlap — AUR may not have crossed paths with your amendment yet.
How long until the IRS answers my response?
Commonly 30-90 days; complex cases longer. If you get another notice restating the original proposal, respond again and invoke your appeal rights — don’t let deadlines lapse while waiting.