IRS Notice CP2000: What It Means

“The income or payment information we received from third parties, such as employers or financial institutions, doesn't match what you reported on your tax return. This difference may increase or decrease your tax or may not change it at all.
The notice explains proposed changes to your tax return and information we used to determine them. This notice isn’t a bill and your response may be required.”

“Review the entire notice and follow the instructions to resolve this issue.
Reply to the notice by the date listed.
If a response form is included in your notice, complete and sign it. State whether you agree or disagree with the notice and include any supporting documentation.
If your notice doesn’t have a response form, follow the notice’s instructions.
If you agree with the notice and don’t have other income, credits, or expenses to report, follow the notice’s instructions. You don’t need to amend your return.
If you don’t reply or we can’t resolve the discrepancy, we may send another notice and a bill.”

“If the CP2000 notice is correct and you have other income, credits or expenses to report:
Complete Form 1040-X, Amended U.S. Individual Income Tax Return
Write "CP2000" on top of Form 1040-X
Choose a reply option and submit the form with your notice response form”