Sole Proprietorship Tax Deadlines in Missouri
Federal and state filing dates, extensions, and estimate schedules for 2026.
Missouri filing deadline
Conforms to the federal calendar-year due date unless the state announces relief.
Due: Apr 15, 2026
Extension: Oct 15, 2026
Form: State income tax return
Estimated payments
Estimated payment dates: Apr 15, 2026, Jun 15, 2026, Sep 15, 2026, Jan 15, 2027.
Due: Apr 15, 2026
FAQ
Does Missouri require Sole Proprietorship estimated payments?
Estimated payments are scheduled for Apr 15, 2026, Jun 15, 2026, Sep 15, 2026, Jan 15, 2027.
Where can I file Missouri Sole Proprietorship taxes?
Use Missouri Department of Revenue resources at https://dor.mo.gov for forms and filing instructions.