Form 80-320-25-8-1-000: Mississippi Individual Income Tax Interest and Penalty Worksheet

Form 80-320-25-8-1-000 PDF Details

This form is also used to calculate first-time home buyer penalty, late payment interest and penalty, and the late filing penalty for Form 80-105 and Form 80-205.

Interest: if your 2025 Mississippi Income Tax Liability is 200 or less, do not complete the remainder of this form; no interest is due on underestimate of tax.

Late filing: add penalty of 5% per month, not to exceed 25% in the aggregate, from the extension due date of the return, October 15th, on the amount of net tax due.

Late filing minimum: the penalty shall not be less than 100.

Payment periods: if line 6 is equal to or more than line 4 for all payment periods, stop here; you do not owe the penalty.