Estimated tax payments not paid by each quarterly due date will be subject to interest on the underpayment – determined by applying the underpayment rate established by 26 U.S.C. §6621 (as provided by Alabama Code Section 40-18-80.1) to the underpayment for the period of underpayment. In addition, the 10% penalty provided for in Alabama Code Section 40-2A-11 applies to estimated tax payments not paid by the quarterly due date.

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