What Does a CP2000 Notice Mean?
A CP2000 looks alarming because it usually shows extra tax owed. But the key word is proposed — nothing is final, and you have a right to respond before anything is assessed.
Why you got one
The IRS runs an automated match between your return and the forms others filed about you (W-2, 1099-NEC, 1099-K, 1099-B, 1099-INT, etc.). When something on those forms isn’t reflected on your return, the system flags it and generates a CP2000.
Common triggers: a 1099 you forgot or never received, stock sales reported without cost basis, freelance income, or interest from an account you overlooked.
The parts that matter
Read these before deciding whether you agree:
- The proposed amount — the additional tax, plus any penalty and interest — proposed, not yet owed.
- The income in question — a table showing what was reported to the IRS vs. what you reported. This is the heart of it.
- The response deadline — usually 30 days. Responding on time preserves your right to dispute.
- The response form — a page where you check "agree" or "disagree" and sign. Disagreeing requires an explanation and often documents.
The IRS sees the gross sale of stock but not what you paid for it, so the proposed tax can look far larger than reality. Supplying cost basis frequently shrinks or erases the balance — which is why you respond rather than just pay.
How to respond
Compare the income table to your own records. If it’s right and you simply missed income, you can agree and arrange payment. If it’s wrong or incomplete (missing cost basis, double-counted income, income that isn’t yours), you disagree in writing with documentation before the deadline. Either way, respond — ignoring it lets the proposed amount become a real bill.
Want your CP2000 decoded?
Paste your notice into Main AI and see exactly which income triggered it, whether the proposed amount looks inflated, and what your response should include.
Analyze your notice — freeCommon questions
Is a CP2000 an audit?
No. It’s an automated under-reporter notice — a proposed adjustment from a document-matching program, not an examination of your whole return. You have the right to agree or dispute it.
Do I have to pay what it says?
Not automatically. The amount is proposed. If you disagree, you respond with an explanation and documents by the deadline. Many CP2000 balances shrink once missing details (like stock cost basis) are supplied.
What happens if I ignore it?
The IRS issues a Statutory Notice of Deficiency and the proposed tax becomes a formal assessment you owe — with fewer options to contest. Respond before the deadline even if you need more time.
How long do I have to respond?
Generally 30 days from the notice date (60 if you’re outside the U.S.). The exact deadline is printed on your notice.