If you received a CP11 notice titled: We Changed Your Return - You Have an Amount Due - it means that IRS changed some of the information on your income tax return and you now have a balance due. The changes we made are outlined in the tax statement on the first page of the notice. You should review these changes and compare them with the information on your copy of your income tax return. Remember, the changes we made may cause some other items on your return to change also, so be sure to review your entire return. We explain why we made the changes on the second page of the notice. Please read this part carefully.

If you agree with our information, make your check or money order payable to the Internal Revenue Service. Include the primary social security number, form number, tax year and your daytime telephone number on your payment and return the stub attached to the last page of the notice with your payment. If you believe that we have made a mistake or that we haven't considered some important information, please call 1-800-829-8815. If possible, have a copy of your tax return and the notice available when you call.

If you normally make estimated tax payments you should review the way you calculated how much to pay, because the changes we made to your income tax return may change the amount of the estimated tax payments you will need to make this year. If you need more information about estimated tax payments, you may order Publication 505 by calling 1-800-829-3676 or refer to Topic 155 for more information on how to order publications.

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