Opening an envelope from the IRS is stressful enough. When it says the IRS thinks you owe more money, panic sets in fast. But a CP2000 notice is not as catastrophic as it looks — if you respond correctly and on time.
What a CP2000 actually is
A CP2000 is a proposed notice — not a bill, not a final assessment, and not an audit. The IRS received income information from a third party (an employer, a bank, a broker, a client who issued you a 1099) and it doesn't match what appeared on your tax return. The IRS is proposing a change and asking you to either agree or dispute it.
Why do CP2000s happen?
The IRS's Automated Underreporter Program (AUR) cross-references every return against third-party reports. Common triggers include:A 1099 from a client that you didn't include (or included under a different amount)Interest income from a bank that didn't make it onto Schedule BDividend income or stock sales reported on a 1099-DIV or 1099-BCancellation of debt income (1099-C)Freelance income reported by a platform (Upwork, Uber, Etsy, PayPal)
Your 5-step response plan
Read the entire notice carefully. Identify exactly what income the IRS says you didn't report, and what proposed changes they're making.Pull your original return and supporting documents. Find your W-2s, 1099s, brokerage statements, and anything else related to the disputed income.Determine if the IRS is right. Sometimes they are — you genuinely forgot a 1099. Sometimes they're wrong — you did report it, or the income wasn't taxable, or you had an offsetting deduction they don't know about.Respond in writing by the deadline. The notice will include a response form. Use it. Agree, disagree, or partially agree — but respond.If you owe, pay or set up a payment plan. If the IRS is right, paying quickly stops penalties and interest from compounding.