K-120: Corporation Income Tax Return (2025)
Kansas · Kansas DOR · Used for tax years 2025
Form K-120 is the 2025 Kansas Corporation Income Tax Return. It reports federal taxable income, Kansas adjustments and apportionment, taxable income, tax, credits, and payments to determine a balance due or overpayment.
What you'll need
Gather the information and attachments that apply to your return:
- The corporation’s EIN and, if applicable, its federal consolidated parent’s EIN, plus business and incorporation details requested on page 1.
- Federal taxable income, taxes deducted on line 17 of the federal return, and interest reported on line 5 of the federal return.
- Dates and amounts of estimated tax payments and any credit carried forward.
- Supporting schedules for entries marked “schedule required,” including applicable income adjustments, nonbusiness income, and the Kansas net operating loss deduction.
- The credit schedules listed in Part I for any credits you claim.
- Schedule K-120AS for applicable apportionment methods, or Schedule K-121 for the combined income method. Common carriers must enclose a mileage apportionment schedule. Alternative or separate accounting requires a letter of authorization and a schedule.
- Applicable Kansas expensing schedules and a separate schedule for other tax payments.
- A detailed explanation if the corporation was involved in a reorganization during the return period.
The form says you do not need to send your entire federal return. It refers to the instructions for the required federal forms, but those instructions are not included in the supplied text.
How to file
Complete the corporation’s filing information, select its Kansas income method, and complete the applicable calculations and schedules. An officer must sign and enter their title and the date.
Mail the return to:
Kansas Corporate Tax
Kansas Department of Revenue
PO Box 750260
Topeka, KS 66699-0260
If sending a payment, complete Form K-120V and enclose it with your payment. Do not staple or submit photocopies of Form K-120.
For an amended 2025 return, mark the amended-return box and indicate the reason for amending.
Common mistakes
- Submitting a photocopy or stapling the form. The form expressly says not to do either.
- Using this version for an earlier year. This form cannot be used for tax years before 2025.
- Using the wrong apportionment schedule. Corporations using the combined income method must use Schedule K-121.
- Claiming too much in nonrefundable credits. Line 32 cannot exceed the tax on line 31, and line 33 cannot be less than zero.
- Carrying forward more than allowed. Line 48 is for original returns only and cannot exceed the total of lines 34, 35, and 36.
- Carrying the payroll percentage to page 1 under the elective two-factor formula. The form specifically says not to carry that percentage to page 1.
Questions people ask
Can I use this form to amend a 2025 return?
Yes. Mark the amended 2025 return box and select the reason: a Kansas-only change, an IRS adjustment, or an amended federal return. This version cannot be used for tax years before 2025.
Do I need to attach my entire federal return?
No. The form says the entire federal return is not required. It refers to the instructions for a list of required federal forms, which is not provided in the supplied text.
Can I apply an overpayment to next year’s estimated tax?
Yes. On an original return, line 48 lets you apply an overpayment to 2026 estimated tax. The amount cannot exceed the total of lines 34, 35, and 36. Line 47 is for the amount you want refunded.
Can the Department of Revenue discuss my return with my preparer?
The form includes an authorization allowing the Director of Taxation or the Director’s designee to discuss your return and enclosures with your preparer.