If you received a CP 21C notice titled, "Statement of Change to Your Account," it means the Internal Revenue Service changed the amount you owe as a result of correspondence you sent in.

The date the correspondence was sent in by you is usually shown as the last sentence on page 1 of your notice.

Please compare this notice with the correspondence you sent in. If you have questions about the changes we made, call us at the toll-free number listed on your notice.

The notice CP 21C is usually sent when you do not owe any additional tax, but you may owe additional interest or penalty charges.

If you do, the amount will be shown on your notice. This amount will not change if it is paid within 10 days of the notice date. If it is later than 10 days, there may be additional interest and penalty charges.

Please make your check or money order payable to the Internal Revenue Service. Write your social security number on your payment and return it with the stub at the end of your notice. Please use the envelope that was enclosed with your notice.

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