Partnership Tax Deadlines in Oklahoma
Federal and state filing dates, extensions, and estimate schedules for 2026.
Oklahoma filing deadline
Calendar-year due date follows federal timing for pass-through entities.
Due: Mar 16, 2026
Extension: Sep 15, 2026
Form: State business income tax return
Estimated payments
No state estimated payment schedule listed.
Due: N/A
FAQ
Does Oklahoma require Partnership estimated payments?
Estimated payments are not typically required at the entity level, but confirm with Oklahoma Tax Commission.
Where can I file Oklahoma Partnership taxes?
Use Oklahoma Tax Commission resources at https://oklahoma.gov/tax.html for forms and filing instructions.