--- title: "IRS CP2000 notice: Definition and Sources | Tax Glossary" description: "An IRS CP2000 notice says income or payment data from third parties does not match a tax return, and it proposes changes to the tax." url: https://wallacecpa.multisites.ai/glossary/irs-cp2000-notice publisher: Wallace CPA phone: +1-877-682-1171 quote: https://wallacecpa.multisites.ai/contact --- IRS notices # IRS CP2000 notice An IRS CP2000 notice says income or payment data from third parties does not match a tax return, and it proposes changes to the tax. A CP2000 is a mismatch notice. The IRS compares what employers, banks and other payers reported with what you put on your return. When they differ, it sends a CP2000 that explains the proposed change. It is not a bill, but it usually needs a response by the date shown. The cause may be a missing [Form 1099-NEC](https://wallacecpa.multisites.ai/glossary/form-1099-nec), a wrong [cost basis](https://wallacecpa.multisites.ai/glossary/cost-basis) on a stock sale, or a plain mistake by the payer. Read the notice, compare it with your records, and answer by the deadline. Unpaid amounts can lead to [penalty abatement](https://wallacecpa.multisites.ai/glossary/penalty-abatement) questions later. The [IRS problems page](https://wallacecpa.multisites.ai/services/irs-problems#notices) explains the next steps. [Wallace CPA can helpIRS problem resolution](https://wallacecpa.multisites.ai/services/irs-problems) ## Related terms - [Form 1099-NEC](https://wallacecpa.multisites.ai/glossary/form-1099-nec) - [Cost basis](https://wallacecpa.multisites.ai/glossary/cost-basis) - [IRS audit](https://wallacecpa.multisites.ai/glossary/irs-audit) - [Penalty abatement](https://wallacecpa.multisites.ai/glossary/penalty-abatement) ## Sources 1. [IRS: Understanding your CP2000 series notice](https://www.irs.gov/individuals/understanding-your-cp2000-series-notice) ## Talk to Wallace CPA Call the Southlake office and say what you need: a return, an IRS letter, your books or a new business. Have the notice or last year's return nearby if you have one. [Call (877) 682-1171](tel:+1-877-682-1171)[Send a message](https://wallacecpa.multisites.ai/contact) 180 State Street, Suite 225, Southlake, TX 76092