Kansas Business Tax Deadlines (2026)
Next: June 15, 2026 — Federal & Kansas Q2 Estimated Tax Payment
Next Deadline: June 15, 2026 — Federal & Kansas Q2 Estimated Tax Payment
Federal Tax Deadlines (2026)
| Form | Who Files | Due Date | Extension Deadline |
|---|---|---|---|
| Form 1040 (Schedule C) | Sole proprietors | April 15 | October 15 |
| Form 1065 | Partnerships, Multi-member LLCs | March 15 | September 15 |
| Form 1120-S | S-Corporations | March 15 | September 15 |
| Form 1120 | C-Corporations | April 15 | October 15 |
| Form 990 | Nonprofits | May 15 | November 15 |
| Estimated Taxes (Q1) | All | April 15 | — |
| Estimated Taxes (Q2) | All | June 15 | — |
| Estimated Taxes (Q3) | All | September 15 | — |
| Estimated Taxes (Q4) | All | January 15, 2027 | — |
Kansas State Tax Deadlines (2026)
| Tax Type | Due Date | Form/Filing | Notes |
|---|---|---|---|
| Individual Income Tax | April 15 | Form K-40 | Rates 3.1%–5.7% |
| Corporate Income Tax | April 15 | Form K-120 | 4% income tax + 3% surtax |
| S-Corp Return | March 15 | Form K-120S | Pass-through |
| Partnership Return | March 15 | Form K-65 | Pass-through |
| Sales Tax (Monthly) | 25th of following month | Via Kansas Customer Service Center | State rate 6.5% |
| Withholding Tax (Monthly/Quarterly) | 15th of following month | KW-5 | Employers |
| Annual Report | April 15 | Filed with Secretary of State | $40 (LLC); $55 (Corp) |
| Estimated Income Tax (Q1) | April 15 | Form K-40ES / K-120ES | — |
| Estimated Income Tax (Q2) | June 15 | Form K-40ES / K-120ES | — |
| Estimated Income Tax (Q3) | September 15 | Form K-40ES / K-120ES | — |
| Estimated Income Tax (Q4) | January 15, 2027 | Form K-40ES / K-120ES | — |
Quarterly Estimated Tax Deadlines in Kansas
Kansas follows the federal estimated tax payment schedule:
Estimated payments are required if you expect to owe $500 or more in Kansas income tax.
Kansas-Specific Tax Requirements
Kansas has a graduated individual income tax with rates of 3.1% and 5.7%. The corporate income tax structure includes a 4% base rate plus a 3% surtax on taxable income over $50,000, for an effective top rate of 7% on corporate income over $50,000. Kansas does not have a separate franchise tax or gross receipts tax.
Kansas's state sales tax rate is 6.5%, with local taxes adding up to 4%, bringing combined rates above 10% in some areas. Kansas recently began exempting groceries from the state sales tax (phased reduction completed in 2025). The economic nexus threshold for remote sellers is $100,000 in sales. Sales tax returns are filed through the Kansas Customer Service Center, typically monthly for most businesses.
Annual reports are due April 15 and filed with the Kansas Secretary of State — $40 for LLCs, $55 for corporations. Kansas requires employers to withhold income tax and file returns monthly or quarterly. The state also has a compensating use tax for purchases where sales tax was not collected.
What Happens If You Miss a Kansas Tax Deadline?
Kansas Department of Revenue
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