CP2000 Notices: How to Help Clients Respond to an IRS Income Mismatch
A CP2000 means the IRS found income on file that doesn't match the return. What the notice is, how to respond on time, and how to prevent the next one by catching missing documents before filing.
Quick answer: A CP2000 notice tells a taxpayer that information the IRS received from third parties, such as W-2s, 1099s and 1098s, doesn't match what was reported on their return, and proposes changes. The IRS says the notice isn't a bill, but a response may be required by the date listed, usually within 30 days of the notice date. Taxpayers can agree, partially agree or disagree with supporting documents. If they don't respond, the IRS may issue a Statutory Notice of Deficiency (CP3219A).
Key takeaways
- A CP2000 is a proposed adjustment, not a formal audit and not a bill.
- Respond by the date on the notice. If more time is needed, call the number on the notice.
- If the notice is correct and there's nothing else to report, an amended return generally isn't needed.
- Many CP2000s trace back to a missing or forgotten income document.
- Comparing client documents to the wage and income transcript before filing prevents many of them.
Why CP2000s happen
The IRS matches information returns filed by employers, banks, brokerages and other payers against individual returns. Common causes include:
- A forgotten 1099-INT, 1099-NEC or 1099-B
- A corrected 1099 issued after the return was filed
- Investment sales reported without cost basis
- Income reported on the wrong line or form
- Identity theft, where someone else earned income under the client's SSN
How to respond
1. Read the notice and note the date
The response date is printed on the notice. According to the IRS, taxpayers usually have 30 days, and should call the number on the notice to request more time if needed.
2. Get authorization
To talk to the IRS on the client's behalf, you'll need Form 2848.
3. Compare against records
Pull the client's wage and income transcript and compare it to the return and the documents the client provided.
4. Choose a response
- Agree: follow the notice's instructions and arrange payment. If there's no other income, credit or expense to report, an amended return generally isn't needed.
- Partially agree or disagree: complete the response form, explain why, and include documentation.
- Additional items to report: the IRS says to write "CP2000" on top of Form 1040-X and submit it with the response form.
- Identity theft: include Form 14039, Identity Theft Affidavit.
5. Keep records
Keep the notice, the response and proof of sending, in line with your retention policy.
Preventing CP2000s
The IRS's own advice on the CP2000 page includes waiting until all income documents arrive before filing. For firms, that means:
- Building each client's list from last year's return, so recurring 1099s aren't forgotten
- Checking uploads to make sure every listed document actually arrived, for the right year
- Comparing against the wage and income transcript before filing, where available
- Waiting for investment-heavy clients, whose forms are often corrected
Correctdocs keeps every requested document on the client's list until it arrives, checks each upload, and follows up automatically on anything missing.
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Frequently asked questions
Is a CP2000 an audit?
No. It's a notice of proposed changes based on mismatched third-party information, asking whether the taxpayer agrees.
How long do I have to respond to a CP2000?
Respond by the date listed on the notice, usually 30 days from the notice date. Call the number on the notice if more time is needed.
What happens if I ignore a CP2000?
The IRS may issue a Statutory Notice of Deficiency, CP3219A, moving closer to assessing the additional tax.