IRS Notice CP2000: What It Means and How to Respond

A CP2000 notice looks like an audit and feels like an audit, but technically it isn’t one. It’s a proposed change generated by the IRS’s Automated Underreporter Program, and you have real options for how to respond — including disputing it. Treat it casually and you’ll lose the dispute by default.

What a CP2000 Notice Actually Is

A CP2000 is a “Notice of Proposed Changes” issued by the IRS’s Automated Underreporter Program (AUR). Computers at the IRS match your filed return against the 1099s, W-2s, 1098s, K-1s, and other information returns the IRS received about you. When something doesn’t match, AUR sends a CP2000 proposing to add the unreported income and recompute your tax.

It is not technically an audit, but it has the same effect if you ignore it. The notice will list the items the IRS believes you omitted, the proposed additional tax, interest, and — often — an accuracy-related penalty of 20%.

Why CP2000 Notices Are Sometimes Wrong

The AUR computer matches gross numbers and doesn’t know context. Common situations where a CP2000 is mistaken:

• A 1099-K from a payment processor reflects gross sales, but you already reported the same income on Schedule C as gross receipts.
• A 1099-MISC was issued in your name for income that actually belongs to your S corporation, partnership, or single-member LLC.
• A 1099-B reports gross proceeds from a brokerage but doesn’t reflect your cost basis, so the entire sale looks like gain.
• An employer issued a corrected W-2 that AUR didn’t pick up.
• A nominee payment was reported to you but you remitted the funds to the actual recipient and properly issued a 1099 of your own.

In every one of these scenarios, the income was either already reported under a different label or shouldn’t have been reported to you at all. The CP2000 dispute is about lining up the income on your return with the information return the IRS received.

Your Three Response Options

Option 1: Agree

If you genuinely forgot to report the income, sign the response form and the additional tax, interest, and penalty will be assessed. Pay or set up a payment plan. The matter closes.

Option 2: Partially Agree

If some items are correct and others aren’t, agree to what’s right and dispute the rest. Mark “I don’t agree with some of the changes” on the response form and explain item by item in a cover letter, with supporting documents.

Option 3: Disagree

If the entire CP2000 is wrong, dispute it. Send a written response by the deadline (usually 30 days) with documentation: corrected 1099s, copies of returns showing the income was already reported, cost-basis statements for stock sales, contracts proving income belonged to your entity, and so on.

What Happens After You Respond

AUR reviews your response. If they accept it, you’ll receive a CP2005 (“we accepted your information, no change”) or a revised CP2000 with smaller adjustments. If they don’t accept it, they’ll issue a Statutory Notice of Deficiency — the 90-day letter. At that point you have 90 days to petition the U.S. Tax Court if you still disagree.

Do not ignore a CP2000. If you do nothing, AUR will issue the notice of deficiency, the 90 days will run, and the tax will be assessed automatically. After that, your only options are to pay and sue for a refund, or to request audit reconsideration — both harder roads than responding on time.

Tips That Help

• Always respond in writing by certified mail with return receipt. AUR’s phone wait times are long and the call agents have limited authority.
• Pull your Wage and Income Transcript to see every 1099 and W-2 the IRS received. Sometimes the CP2000 only mentions some of them.
• If the proposed penalty matters, request abatement on reasonable cause or first-time abatement grounds in the same response.
• Keep a copy of everything you send. AUR loses documents, and the burden of proving you responded is on you.