K-220: Underpayment of Estimated Corporation Tax Schedule (Revision)
Kansas · Kansas DOR · Used for tax years 2024, 2025, 2026
Kansas Schedule K-220 helps corporations determine whether they paid the correct amount of estimated income tax on time. It compares payments with penalty exceptions and calculates any underpayment penalty to enter on Form K-120. The supplied form is labeled 2025, not 2024.
Who files this form
Kansas Schedule K-220 helps a corporation determine whether it paid enough estimated tax by the required due dates and whether it owes an underpayment penalty.
Every corporation must pay estimated tax if its Kansas tax liability for the taxable year can reasonably be expected to exceed $500. A corporation is not required to file a declaration in its first year of existence in Kansas.
The text explains who must pay estimated tax but does not state a separate requirement for who must file K-220.
When it's due
The supplied K-220 is labeled 2025. Its printed timing rules include:
- 2025 tax year estimated payments: Installments are due on the 15th day of the 4th, 6th, 9th and 12th months of the taxable year.
- Short taxable years: Any estimated tax payable in installments that remains unpaid before the 15th day of the last month must be paid on that day.
- Weekend or holiday rule: If a due date falls on a Saturday, Sunday or legal holiday, use the next regular workday.
- 2025 calendar-year penalty calculation: The instructions calculate the penalty through the earlier of the date the tax was paid or April 15, 2026.
The supplied text does not print separate deadlines for the 2024 or 2026 tax years.
What you'll need
Have the following information ready:
- Your corporation’s name as shown on Form K-120 and its Employer Identification Number (EIN).
- Your current-year and prior-year Forms K-120. Lines 1 and 3 of K-220 use line 33 minus line 37 from those returns.
- The amounts and dates of estimated tax payments, plus any credit carried forward from the beginning of the tax year.
- Income information for the applicable months if you use the annualized-income exception.
- The date the tax was paid, if needed to calculate the penalty period.
Common mistakes
- Using the wrong number of days for an installment. The instructions specifically warn that lines 10 and 11 need the correct day counts to calculate the applicable penalty on lines 12 and 13.
- Counting days after December 31, 2025, on line 10. The instructions say to put days after that date on line 11.
- Missing the annualization checkbox. If you annualize income to meet the exception on K-220 line 7, check the box within the Estimated Tax Penalty line of Form K-120.
Questions people ask
When does an underpayment penalty apply?
If the minimum estimated tax amount was not paid on time, a penalty is imposed for the period of underpayment.
Can a corporation qualify for an exception to the penalty?
Yes. Your 2025 payments on line 5 must equal or exceed the amount for one of the exceptions on line 6 or line 7 for the same payment period. Line 6 uses the smaller of 90% of current-year tax or prior-year tax liability, multiplied by the percentages printed for each installment. Line 7 provides an annualized-income exception.
What payments belong on line 5?
Enter cumulative timely paid estimated tax payments and credit carried forward from the beginning of the tax year through each installment due date. For example, the instructions say a calendar-year filer’s third column includes timely payments from January 1 through September 15, 2025.
Where do I report the total penalty?
Add the amounts in all columns of line 14. Enter the total on K-220 line 15 and on the Estimated Tax Penalty line of Form K-120.