83-391: Insurance Company Income Tax Return (2025)
Mississippi · Mississippi DOR · Used for tax years 2025
Mississippi Form 83-391 is the 2025 Insurance Company Income Tax Return. It reports Mississippi and company-wide income and deductions, calculates Mississippi net taxable income and income tax, and accounts for credits, payments, and any balance due or overpayment.
Who files this form
Form 83-391 is the Mississippi Insurance Company Income Tax Return for 2025. It includes checkboxes for fire and casualty, accident and health, and life insurance.
The form does not state which insurance companies are required to file.
What you'll need
Have the information and supporting records needed for the lines you complete:
- Company identification, including FEIN, Mississippi Secretary of State ID, county code, NAICS code, and tax-year beginning and ending dates.
- Mississippi and company-wide income, premium, benefit, expense, and deduction records.
- The annual statement for the apportioned deductions reported in page 4, Part IV.
- Records of prior-year overpayments, estimated tax payments, and payments with an extension.
- Form 83-401 or Form 83-310 for income tax credits, if applicable.
- Form 83-155 for a Mississippi net operating loss, if applicable.
- Form 83-305 for interest and penalty on underestimated income tax payments, if applicable.
Attach schedules for agency expense and other allocable deductions. Mississippi corporations reporting retaliatory taxes paid must itemize them by state and attach copies of returns documenting the amounts. Attach supplementary schedules or pages as needed.
How to file
Complete the income, deduction, and tax computations, rounding amounts to the nearest dollar. Complete the officer signature, title, and date fields on page 2, along with the paid preparer fields if applicable.
Mail the return to:
Department of Revenue
P.O. Box 23191
Jackson, MS 39225-3191
For a balance due, the form says to attach a check or money order or see the instructions for electronic payment options. No instructions were provided here, and the form does not give an e-filing method.
Common mistakes
- Not rounding amounts: The form directs you to round to the nearest dollar.
- Not separately apportioning expenses: Page 4 says expenses must be separately apportioned. Attach supplementary pages as needed.
- Omitting supporting schedules: The form calls for attached schedules for agency expense and other allocable deductions.
- Leaving retaliatory taxes undocumented: Mississippi corporations must itemize these taxes by state and attach copies of returns documenting the amounts.
- Missing the reporting company’s FEIN: If filing a combined income tax return, enter the reporting company’s FEIN.
Questions people ask
Can an overpayment be credited to next year?
Yes. Page 1, line 16 reports the amount credited to next year. Line 17 reports the refund, calculated as total overpayment on line 15 minus line 16.
Who can report retaliatory taxes paid to other states?
The form limits this entry to Mississippi corporations. Itemize the taxes in page 4, Part V, attach copies of returns documenting the amounts, and carry the total to page 1, line 3.
Can the return be discussed with my preparer?
Page 2 includes a checkbox to indicate that the return may be discussed with the preparer.
Does the form list a minimum late filing penalty?
Yes. Page 1, line 13 lists a minimum late filing penalty of $100.