The IRS compares information returns filed on forms W–2, 1098, 1099, etc., with income and deductions reported on prior year income tax returns. If you forgot to report any income, payments, or credits or overstated certain deductions on a prior year return, you may receive the Underreporter Notice CP–2000. The identifying symbol CP–2000 appears on page 1 in the lower or upper right–hand corner.

The notice informs you of the proposed changes to income, payments, credits, or deductions; and the amount due to IRS, or refund due to you. It is normally a five to six page letter.

The first page provides instructions on what you should do if you agree or disagree with the proposed changes.

You are provided with the changes proposed by the IRS, the amounts shown on your return, the amounts reported to IRS, and the increase or decrease in income. The notice computes the tax liability based on the income changes. It can propose additional tax you owe IRS, or it may show a refund due to you.

The notice summarizes the income, payments, credits and deductions reported to IRS by payers, but not identified or fully reported on your income tax return. It provides you the name of the payer, the payer's identifying number, what kind of document was issued, such as a Form W–2 or 1099, and the social security number of the person it was issued to. Be sure that you review this information carefully to verify its accuracy.

A taxpayer response page is also included. It has boxes for you to indicate whether you agree, or disagree with the proposed changes. It also has an area for you to authorize someone in addition to yourself to discuss and give information to the IRS pertaining to the proposed changes. This page should be attached to your response.

If you agree that the tax changes are correct, sign the consent statement on the taxpayer response page. You may pay the amount you owe within 15 days from the date of notice to avoid further interest charges, or you may send the signed consent without payment. We will bill you for the amount due plus additional interest. You may request a payment arrangement to pay the proposed amount you owe IRS. If you wish to pay in installments, please tell us in your response, and we will contact you later with payment information. If an installment agreement is approved, you will be charged a fee.

If you DO NOT agree with the notice or if any part of the summary is incorrect, DO NOT SIGN THE NOTICE. Check Box B on the response page, explain why you do not agree in a signed statement, attach the statement and any supporting documents you want us to consider to the response page, and send it to us. Include your phone number with area code and the best time of day to call.

Do not file an amended return, Form 1040X (PDF), to correct items you do not agree with. These are only proposed changes and the tax liability is not yet assessed.

You must respond within 30 days of the date of the notice. If you live outside of the United States you must respond within 60 days of the date of the notice. An envelope will be enclosed for your convenience. Please use this envelope for your response. If you have lost the envelope, please send your response to the address listed in the upper left hand corner on page 1.

If we do not hear from you within the 30 or 60 day period, a statutory notice of deficiency will be issued and additional interest will be charged.

After responding to the notice, if your tax matter has not been resolved to your satisfaction, you may contact the IRS Underreporter Office by calling 1–800–829–7157.

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