After you file

You need to review the notice and make sure whether you agree or disagree with the letter. CP2000 letters are sent when the IRS finds that there was a 1099, W2, or 1098 that they received which doesn't agree with the income or deductions reported on your return.

See the following from IRS - Understanding Your CP2000:

• Read your notice carefully—it explains the information we received and how it affects your tax return.
• Complete the notice response form whether or not you agree or disagree with the notice, the response form explains what actions to take. (Your specific notice may not have a response form. In that case, the notice will have instructions on what to do).
• Contact the business or person reporting the information, if it is wrong. Ask them to correct it, and then provide the corrected information to us.

• Make sure your other returns don’t have the same mistake.
• Contact us with any unanswered questions you have.
• Keep a copy of the notice for your files.
• Fill out section 3 (Authorization) on the response form to allow someone, in addition to yourself, to contact us concerning this notice. Or send us a Form 2848, Power of Attorney and Declaration of Representative to allow someone (such as an accountant) to contact us on your behalf.
• Correct the copy of your tax return that you kept for your records.
• Order a transcript of your return.
• Use this link to learn more about your payment options if you owe additional taxes.
• Use this link to learn more about payment plans and installment agreements if you can’t pay the full...
• Use this link to learn more about Offers in Compromise if you can’t pay the full amount of taxes you...