Kansas business tax extension
Kansas honors the federal extension: filing Form 7004 with the IRS also extends Form K-120, with no Kansas extension form. The federal extension is Form 7004, due for calendar-year corporations and for partnerships and S corporations. In general, an extension gives you more time to file, not more time to pay.
Last updated · From Kansas's own forms, instructions and laws, cited below
Does Kansas accept the federal extension?
A federal extension carries over: filing Form 7004 with the IRS also extends the Kansas return, with no separate Kansas extension form.
Kansas's rules for each business return, as its own instructions and laws state them:
Corporations
- Return
- Form K-120, Kansas Corporation Income Tax Return
- Due date
- One month after the federal due date, including any IRS extension
- Extension
- A federal extension carries over: filing Form 7004 with the IRS also extends the Kansas return, with no separate Kansas extension form. Enclose a copy of federal Form 7004 with Form K-120.
- Extension length
- 6 months
- Payment
- The tax is due by the 15th day of the 4th month after the tax year ends (April 15 for a calendar year), even though the return is due later. To pay with the extension: Form K-120V, Kansas Corporate Payment Voucher, with the extension payment box marked, or electronically.
S corporations and partnerships (Form K-120S)
- Return
- Form K-120S, Kansas Partnership or S Corporation Income Tax Return
- Due date
- For a calendar year, one month after the federal due date, including any IRS extension; for a fiscal year, the 15th day of the 4th month after the tax year ends
- Extension
- A federal extension carries over: filing Form 7004 with the IRS also extends the Kansas return, with no separate Kansas extension form. Enclose a copy of federal Form 7004 with Form K-120S. The extension does not extend a shareholder's or partner's Kansas Form K-40.
- Extension length
- 6 months
- Payment
- For a calendar year, any tax is due April 15, even though the return is due later. To pay with the extension: Form K-120V with the Extension Payment box marked, or electronically.
Estates and trusts
- Return
- Form K-41, Kansas Fiduciary Income Tax Return
- Due date
- The 15th day of the 4th month after the tax year ends (April 15 for a calendar year)
- Extension
- A federal extension carries over: filing Form 7004 with the IRS also extends the Kansas return, with no separate Kansas extension form. Enclose a copy of federal Form 7004 with Form K-41.
- Payment
- The tax is due by the original due date, even with an extension. To pay with the extension: Form K-41V, Kansas Fiduciary Payment Voucher, with the Extension Payment box marked, or electronically.
When a due date in Kansas falls on a weekend or legal holiday, it moves to the next business day. Kansas's holidays can differ from the federal ones, so a rule not tied to a federal date is given without a computed date.
When is the federal business extension due?
Corporations, S corporations, partnerships, multi-member LLCs, estates and trusts extend their federal return with Form 7004, filed by the return's original due date. The extension is automatic: no reason is needed and the IRS doesn't approve it. We e-file it for a flat $9.95. These are the 2027 dates for calendar-year 2026 returns:
| Return | Who files | File the extension by | Extended to |
|---|---|---|---|
| Form 1065 Partnerships & multi-member LLCs, Form 7004 | 6 months | ||
| Form 1120-S S corporations (and LLCs taxed as S corps), Form 7004 | 6 months | ||
| Form 1120 C corporations (and LLCs taxed as C corps), Form 7004 | 6 months | ||
| Form 1041 Estates & trusts, Form 7004 | 5½ months | ||
| Form 990, 990-EZ, 990-PF Tax-exempt organizations & private foundations, Form 8868 | May 15, 2027 is a Saturday | 6 months |
Federal dates follow the IRS rule: a deadline on a weekend or legal holiday moves to the next business day. A fiscal-year business counts from its own year-end; see the fiscal-year deadline guide.
Tax-exempt organizations extend the 990 series with Form 8868, not Form 7004. Each return needs its own extension, so extending a business return does not extend its owners' personal returns.
Does an extension give more time to pay?
No. A federal extension moves the filing deadline only: tax owed is due by the original due date, and the IRS charges interest and the late-payment penalty on anything paid after it. Kansas's instructions say the same for its returns: a Kansas extension doesn't move the payment deadline. More in does an extension give you more time to pay?
Where are Kansas's forms and instructions?
On the Kansas Department of Revenue website, which has the current forms, instructions and online services. The rules on this page are summarized from the sources below. We e-file the federal extension; the Kansas return and any Kansas extension request go to the state.
Kansas extension FAQ
Does Kansas accept the federal business tax extension?
A federal extension carries over: filing Form 7004 with the IRS also extends the Kansas return, with no separate Kansas extension form. The extension is 6 months. Enclose a copy of federal Form 7004 with Form K-120.
When is the Kansas Form K-120 due?
One month after the federal due date, including any IRS extension.
Does a Kansas extension give more time to pay?
No. The tax is due by the 15th day of the 4th month after the tax year ends (April 15 for a calendar year), even though the return is due later. To pay with the extension: Form K-120V, Kansas Corporate Payment Voucher, with the extension payment box marked, or electronically.
Does a Kansas business still need a federal extension?
Yes, to get more time for its federal return: Form 7004, filed by April 15, 2027 for a calendar-year corporation or March 15, 2027 for a partnership or S corporation. In Kansas, that federal extension also extends the state return.
Sources
- Kansas Department of Revenue Home Page, read
- Forms and Publications - Corporate Income, read
- 2025 Corporate Income Tax Instructions (Rev. 7-25) (PDF), read
- K-120V 2025 Kansas Corporate Income Tax Voucher for K-120 and K-120S (Rev. 8-15-25) (PDF), read
- 2025 Partnership or S Corporation Income Tax Instruction Booklet (Rev. 7-25) (PDF), read
- 2025 Fiduciary Income Tax Booklet (Rev. 7-25), including Form K-41V Fiduciary Payment Voucher (PDF), read
Filing a federal business extension this season?
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