K-120S: Partnership or S Corporation Income Tax Return (2024)
Kansas · Kansas DOR · Used for tax years 2024
Form K-120S is the 2024 Kansas Partnership or S Corporation Income Tax Return. It reports federal income, Kansas adjustments and apportionment, and total Kansas income, with sections for entity-level tax elections, tax payments, balances due, and refunds.
Who files this form
Form K-120S is the 2024 Kansas Partnership or S Corporation Income Tax Return. The form asks you to identify the business as either a partnership or an S corporation.
The supplied form does not state which businesses are required to file.
What you'll need
The form tells you to enclose:
- Pages 1 through 4 of your federal return, plus page 5 if filing as a partnership.
- Federal Schedules M-1 and M-2.
- Any federal schedules supporting Kansas modifications.
- An organizational chart showing all partnerships, S corporations, and taxable entities.
Depending on your entries, you may also need:
- Supporting schedules for income additions, subtractions, nonbusiness income, and other lines marked “schedule required.”
- Schedule K-121S if using the combined income method, a mileage apportionment schedule for common carrier mileage, or an authorization letter and schedule for alternative or separate accounting.
- Applicable schedules for Kansas expensing recapture or deductions.
- Separate schedules for estimated tax paid, amounts credited forward, and other tax payments.
- Partner or shareholder names, addresses, tax identification numbers, ownership percentages, and income distribution information.
- A detailed explanation if the corporation underwent a reorganization during the return period.
How to file
Complete the business and taxable-year information, select partnership or S corporation, and enter the income, Kansas adjustments, and applicable tax and payment amounts.
Complete Part II for all partners or shareholders. Complete Part III for individual or fiduciary partners or shareholders who elected to pay tax on Form K-120S. Include applicable apportionment, pass-through entity, and disregarded entity schedules.
Sign and date the return and include the required attachments. Do not staple. If sending a payment, complete Form K-120V and enclose it with the payment.
Mail to:
Kansas S Corporation Income
Kansas Department of Revenue
PO Box 750260
Topeka, KS 66699-0260
The supplied text does not provide e-filing instructions.
Common mistakes
- Stapling the return. The form says “DO NOT STAPLE.”
- Leaving partners or shareholders off Part II. Include all of them. If there are more than 12, submit an additional schedule similar to the printed schedule.
- Forgetting to mark an amended return. Check the amended-return box when applicable.
- Sending payment without the voucher. Complete Form K-120V and enclose it with your payment.
- Entering too much as a credit forward. Line 46 is for an original return only and cannot exceed the total of lines 33, 34, and 35.
- Using the wrong apportionment schedule for the combined income method. Corporations using that method must use Schedule K-121S.
Questions people ask
How do I indicate an election to pay tax at the entity level?
Mark box N. Box O is for an entity electing entity-level taxation that also wishes to tax 100% of the income for Kansas residents.
What tax rate appears on the 2024 form for an electing pass-through entity?
Line 32 calculates the tax as 5.58% of the total taxable income on line 31.
Can I request a refund or apply an overpayment to the next year?
Yes. Enter the amount you want refunded on line 45. On an original return, line 46 lets you apply an amount to 2025 estimated tax, limited to the total of lines 33, 34, and 35.
What if my taxpayer information has changed since my last return?
Mark box K if any taxpayer information has changed since the last return was filed.