IRS Notice CP2000: Underreporter Inquiry — Income Discrepancy

IRS Notice CP2000 is not a bill and not an audit — it is a proposal to change your tax return because the IRS found income that doesn’t match what you reported.

What CP2000 Means

Every year, employers, banks, brokerages, and other payers send income reports (W-2s, 1099s) directly to the IRS. The IRS’s Automated Underreporter (AUR) program cross-references these reports against what you reported on your tax return. When there’s a discrepancy — income shown on a third-party form that doesn’t appear on your return — the IRS generates CP2000.

CP2000 shows you the specific income items the IRS believes you underreported, the proposed additional tax, and any penalties and interest that would apply if you agree. This is a proposed change, not a final assessment. You have the right to agree, disagree, or provide additional information that resolves the discrepancy without additional tax being owed.

Common reasons for a CP2000: a 1099 you forgot to include, stock sale proceeds reported without the cost basis, freelance income from a new platform, or a rollover shown as a distribution on a 1099-R.

Why You Received This Notice

You received CP2000 because:

• A W-2 or 1099 form submitted by a payer shows income that doesn’t appear on your tax return
• You may have omitted income, reported it on the wrong line, or the payer may have reported incorrectly
• The difference resulted in a computed tax deficiency of at least a minimum threshold

Key Deadline and Consequences of Ignoring

CP2000 gives you 60 days from the notice date to respond (some notices specify 30 days to agree or provide additional information). If you do not respond:

• The IRS will finalize the proposed changes and send a Statutory Notice of Deficiency (90-day letter)
• You then have 90 days to petition the U.S. Tax Court — or the assessment becomes final
• Once the assessment is final, interest and the 20% accuracy-related penalty may apply
• The resulting balance will trigger the standard collection process (CP14, CP501, CP503, CP504)

What to Do — Step by Step

1. Read the notice carefully. Identify each income item the IRS is questioning. Match each item to your records — W-2s, 1099s, brokerage statements.
2. Determine if the IRS is right. Sometimes payers report incorrectly, or the income was exempt (a Roth conversion, an inheritance, a loan repayment). If the IRS is wrong, gather documentation.
3. If you agree with all proposed changes, complete and sign the response form included with the notice and return it with payment or a request for a payment plan.
4. If you partially agree, check the items you agree with, explain the items you don’t, and submit supporting documentation.
5. If you disagree entirely, write a clear explanation of why each proposed change is incorrect and attach supporting documents (1099 corrections, cost basis records, exempt income documentation).
6. Don’t miss the deadline. Even if you need more time to gather documents, call the IRS or send a written request to extend the response deadline.
7. Work with a tax professional if the amounts are significant or the income types are complex (stock sales, self-employment income, retirement distributions).

Your Rights

You have the right to:

• Agree or disagree with any proposed change
• Provide documentation that shows the IRS’s proposed change is incorrect
• Request a conference with an IRS manager if you disagree with the outcome
• Petition the U.S. Tax Court if a Statutory Notice of Deficiency is issued
• Seek assistance from the Taxpayer Advocate Service or a Low Income Taxpayer Clinic (LITC)

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