State & Local Tax (SALT)
State Tax Deadlines
Missouri largely conforms to federal filing deadlines.
Missouri Tax Deadlines at a Glance (2026)
Entity Type | Return Due | Extension Deadline |
|---|---|---|
Individuals | April 15, 2026 | October 15, 2026 |
C Corporations | April 15, 2026 | October 15, 2026 |
S Corporations | March 16, 2026 | September 15, 2026 |
Partnerships | March 16, 2026 | September 15, 2026 |
Businesses
Composite returns are available for nonresident owners.
Fiscal-Year Entities
Due dates follow months after year-end.
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