Missouri Business Tax Deadlines (2026)
Next: June 15, 2026 — Federal & Missouri Q2 Estimated Tax Payment
Next Deadline: June 15, 2026 — Federal & Missouri 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 | — |
Missouri State Tax Deadlines (2026)
| Tax Type | Due Date | Form/Filing | Notes |
|---|---|---|---|
| Individual Income Tax | April 15 | Form MO-1040 | Top rate 4.7% (reduced from 4.95%) |
| Corporate Income Tax | April 15 | Form MO-1120 | 4% rate |
| S-Corp Return | March 15 | Form MO-1120S | Pass-through |
| Partnership Return | March 15 | Form MO-1065 | Pass-through |
| Sales Tax (Monthly) | Last day of following month | Via MyTax Missouri | State rate 4.225% |
| Withholding Tax (Monthly/Quarterly) | 15th of following month | MO-941 via MyTax | Employers |
| Annual Report/Registration | Anniversary of formation | Filed with Secretary of State | No fee for most entities |
| Estimated Income Tax (Q1) | April 15 | Form MO-1040ES / MO-1120ES | — |
| Estimated Income Tax (Q2) | June 15 | Form MO-1040ES / MO-1120ES | — |
| Estimated Income Tax (Q3) | September 15 | Form MO-1040ES / MO-1120ES | — |
| Estimated Income Tax (Q4) | January 15, 2027 | Form MO-1040ES / MO-1120ES | — |
Quarterly Estimated Tax Deadlines in Missouri
Missouri follows the federal estimated tax payment schedule:
Estimated payments are required if you expect to owe $100 or more in Missouri income tax.
Missouri-Specific Tax Requirements
Missouri has been steadily lowering its individual income tax rate, now at a top rate of 4.7% (with plans for further reductions). The corporate income tax rate is 4%, one of the lowest in the nation. Missouri allows a deduction for federal income taxes paid on the state return, similar to Alabama and Iowa, which can significantly reduce state tax liability. There is no franchise tax or gross receipts tax.
Missouri's state sales tax rate is 4.225%, but local taxes (city, county, and special districts) frequently push combined rates above 10% in metro areas like St. Louis and Kansas City. Missouri has one of the most complex local sales tax structures in the country. The economic nexus threshold for remote sellers is $100,000 in sales. Businesses must register with the Department of Revenue and file sales tax through MyTax Missouri.
Missouri does not charge a fee for annual reports for most entity types. Employers must withhold state income tax and file on a monthly or quarterly basis. Missouri also imposes local earnings taxes in Kansas City (1%) and St. Louis (1%), which require separate employer withholding.
What Happens If You Miss a Missouri Tax Deadline?
Missouri Department of Revenue
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