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Topic no. 653, IRS notices and bills, penalties and interest
Jan 2, 2025 The failure-to-pay penalty is one-half of one percent for each month, or part of a month, up to a maximum of 25%, of the amount of tax that
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Application for Extension of Time To File U.S. Income Tax
If your return is more than 60 days late, the minimum penalty is $210 (adjusted for inflation) or the balance of tax due on your return, whichever is smaller.
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26 U.S. Code 6601 - Interest on underpayment, nonpayment
If any portion of a tax is satisfied by credit of an overpayment, then no interest shall be imposed under this section on the portion of the tax so satisfied
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