If you received a CP 11 notice titled: We changed your return - You have an amount due - it means that IRS changed some of the figures on your income tax return and you now have a balance due. We explain why we made the changes on the second page of the notice. Please read that part carefully.

The changes we made to your figures are outlined in the tax statement on the first page of the notice. You should look them over and compare the figures with the ones on your copy of your income tax return. And remember, the changes we made may cause some other items on your return to change also, so you may wish to review your whole return.

If you agree with our figures, make your check or money order payable to the Internal Revenue Service.

Include your social security number, Form number, tax year and your daytime telephone number on your payment and return the stub on the last page of the notice with your payment. If you believe that we have made a mistake in our figures or that we haven't considered some important information, please call us at the toll-free number, 1-800-829-8815. If possible, please have a copy of your tax return and the notice when you call.

If you normally make estimated tax payments you should check over the way you figured 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 refer to Publication 505, Tax Withholding and Estimated Taxes.

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