“Took time out of his busy day to answer one important question I had even though I was not a client. I appreciate everything.”
If a CP2000 notice showed up in your mailbox, take a breath - it’s one of the most common IRS notices, and it’s not an audit.
What a CP2000 actually is
The IRS matches the income on your return against what third parties report - W-2s from employers, 1099s from banks, brokers, and platforms. When something on your return doesn’t match their records, an automated system generates a CP2000 proposing a change to your tax. It might be a 1099 you forgot, a brokerage sale reported without its cost basis, or simply an IRS error.
Why it’s not an audit
A CP2000 is an under-reporter notice. The IRS isn’t examining your books - it’s flagging a specific document mismatch and proposing a number. You have the right to agree or disagree, fully or in part.
What to do
- Read it carefully. It lists each item the IRS thinks is missing or wrong.
- Compare to your records. Sometimes the IRS is right; sometimes it’s double-counting or missing your cost basis.
- Respond by the deadline - usually 30 days. You can agree and pay, agree and set up an IRS payment plan, or dispute with documentation.
- Don’t just pay it if it’s wrong. A common CP2000 overstates tax on stock sales because the broker reported proceeds without basis.
When to get help
If the proposed balance is large, involves investment sales, or you’re not sure whether the IRS is right, an Enrolled Agent can read the notice, pull your IRS transcripts, and respond on your behalf. Where the underlying return needs correcting rather than defending, that becomes an amended return on Form 1040-X. Where the notice traces back to a year you never filed, start with back taxes and unfiled returns.
Frequently asked questions
Is a CP2000 an audit?
No. A CP2000 is an automated under-reporter notice, not a formal audit. It proposes a change based on a document-matching mismatch, and you can agree or dispute it.
What happens if I ignore a CP2000?
The IRS will typically follow up with a Statutory Notice of Deficiency (CP3219A), after which the proposed tax becomes assessable. Responding by the deadline keeps your options open and often reduces what you owe.