Form 80-320-12-8-2-000 (Rev. 08/2/12)
Mississippi
Individual Income Tax
Interest and Penalty Worksheet Instructions
Use Form 80-320 if your 2012 Mississippi Income Tax Liability exceeds $200 to calculate interest on underpayment of estimated tax.
This form is also used to calculate late payment interest and penalty, and the late filing penalty for the Resident Individual Income Tax
Return (Form 80-105) and the Non-Resident/Part-Year Resident Return (Form 80-205).
Specific Line Instructions
Underestimate
Line 1
Enter Your 2012 Mississippi Income Tax Liability from Form 80-105, Line 25, Resident Individual Income Tax Return OR
from Form 80-205, Line 25, of the Non-Resident / Part Year Income Tax Return. If your 2012 Mississippi Income Tax
Liability is $200 or less, do not complete the remainder of this form; no interest is due on underestimate of tax.
Line 3
Enter Your 2011 Mississippi Income Tax Liability from Form 80-105, Line 22 Minus Line 25 and Line 26, Resident
Individual Income Tax Return OR from Form 80-205, Line 22 Minus Line 25, Non-Resident / Part-Year Individual
Income Tax Return.
Line 4
Enter the lesser of Line 2 or Line 3. If Line 3 is zero and your 2012 Mississippi Income Tax Liability (Line 2) exceeds $200
and no estimate payments for the 2012 tax year were made, enter the amount from Line 2.
Late Filing Penalty
Line 14
Enter Late Filing Penalty Due. 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 tax due in Line 13. The penalty shall not be less than $100.
Late Payment Interest and Penalty
Line 16 Enter Late Payment Interest Due. Add interest of 1% per month from the original due date of the return, April 15th, on the
amount of tax due from Line 15.
Line 17
Enter Late Payment Penalty Due. Add penalty of 1/2% per month, not to exceed 25% in the aggregate, from the
original due date of the return, April 15th, on the amount of tax due from Line 15.