K-121: Combined Income Method of Reporting Schedule (Revision)
Kansas · Kansas DOR · Used for tax years 2024, 2025, 2026
Kansas Form K-121 is a corporation schedule for the combined income method of reporting. It reports corporate income and adjustments, calculates the share apportioned to Kansas using property, payroll and sales information, and determines combined report income and tax for Form K
Who files this form
Form K-121 is the Kansas Corporation Combined Income Method of Reporting schedule.
The form states that a corporation using the combined income method with more than one entity doing business in Kansas may file one Kansas return reporting the total Kansas combined income and tax. It does not state which corporations must use this method.
What you'll need
- A copy of federal Form 851, which must be enclosed with K-121.
- The name shown on Form K-120, the employer identification number (EIN), and separate corporate names and federal identification numbers.
- Federal taxable income and the amounts needed for the listed additions and subtractions.
- Supporting schedules for entries marked “schedule required,” including applicable income adjustments, nonbusiness income, and the Kansas net operating loss deduction.
- Property, rental, payroll, and sales figures for the Kansas corporations and total company to complete Part II.
- Schedules for other tangible assets and other income, if reported in Part II.
How to file
Enclose a copy of federal Form 851 with this schedule.
After completing K-121:
- Enter the combined report income from line 27 on line 27 of Form K-120.
- Enter the total tax from line 30 on line 31 of Form K-120.
The supplied form text does not provide a mailing address or e-filing directions.
Common mistakes
- Leaving out federal Form 851. The form specifically says to enclose a copy with this schedule.
- Omitting required supporting schedules. Include schedules for entries marked “schedule required,” and enclose or attach the schedules requested for other tangible assets and other income in Part II.
Questions people ask
Can multiple Kansas entities be reported on one return?
Yes. The form says a corporation filing under the combined income method with more than one entity doing business in Kansas may file one Kansas return reporting the total Kansas combined income and tax.
What federal form must accompany K-121?
Enclose a copy of federal Form 851 with this schedule.
Where does the Kansas apportionment percentage come from?
Part I, line 20 uses the percentage from Part II, line 6.
Where do I report the final income and tax amounts?
Enter K-121 line 27, combined report income, on Form K-120 line 27. Enter K-121 line 30, total tax, on Form K-120 line 31.