84-125: Business Income Apportionment Schedule (2025)
Mississippi · Mississippi DOR · Used for tax years 2025
Mississippi Form 84-125 is the 2025 Business Income Apportionment Schedule. It compares Mississippi property, payroll and sales with totals everywhere and applies the appropriate apportionment formula to calculate a ratio for Form 84-122, line 21.
What you'll need
Have the following information ready for the 2025 schedule:
- Your federal employer identification number (FEIN).
- Mississippi and everywhere totals for property at the beginning and end of the taxable year.
- Annual rental property amounts.
- Mississippi and everywhere payroll and sales totals.
Airlines, motor carriers, express companies, and telephone and telegraph companies must attach a special-formula schedule. The resulting apportionment ratio goes on Form 84-122, line 21.
Common mistakes
- Check only one category in Part II.
- Round Part II ratios to four decimal places.
- Attach a schedule when using the special formula on line 7.
- Enter the resulting ratio on Form 84-122, line 21.
- Major medical or pharmaceutical suppliers should see the Form 84-100 instructions, as directed on the schedule.
Questions people ask
What do columns A, B, and C represent?
Column A is the Mississippi total, column B is the everywhere total, and column C is the Mississippi ratio.
How is the property factor calculated?
Add beginning-of-year and end-of-year property amounts, then divide by two to find the average net book value of assets. Multiply the annual rental property amount by eight and add it to that average. Divide the Mississippi total on line 1f by the everywhere total on line 1f.
How are the payroll and sales factors calculated?
For each factor, divide the Mississippi amount in column A by the everywhere amount in column B.
Where does the final apportionment ratio go?
Part II directs you to enter the resulting ratio on Form 84-122, line 21.
Which businesses need a special formula?
The form lists airlines, motor carriers, express companies, and telephone and telegraph companies under the special-formula category. Line 7 requires an attached schedule.