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Reading a balance-due notice
Common notices list tax, penalties, and interest separately. Enter those lines yourself — we do not upload or OCR letters.
Balance-due notices (for example letters in the CP series) typically show tax due, penalties, and interest as of a notice date, plus a payment due date.
Use the notice’s figures in the optional comparison fields. Confirm the response deadline printed on the letter; our date math only adds the day count you enter.
If anything is unclear, the controlling document is the notice itself and IRS.gov — not this calculator.