Oklahoma Personal Tax Extension 2026: 2025 Tax-Year Filing Guide
Individual Income Tax · Form 511
Oklahoma generally honors a federal extension for individual returns. The 2025 return and payment are due April 15, with filing extended to October 15. For federal details, see our federal tax extension resources.
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✓ Secure e-filing✓ 24/7 filingOklahoma generally honors a federal extension for individual returns. The 2025 return and payment are due April 15, with filing extended to October 15.
Last updated: September 12, 2026Oklahoma Personal Tax Extension: Filing Details
Oklahoma generally honors a federal extension for individual returns. The 2025 return and payment are due April 15, with filing extended to October 15.
Quick Reference: Deadlines and Forms
Use this summary to confirm Oklahoma filing deadlines, forms, and payment requirements.
| Item | Oklahoma personal return | Deadline or method |
|---|---|---|
| Original deadline | Form 511 | April 15, 2026 |
| Extended deadline | Automatic with Federal | October 15, 2026 |
| Return form | Form 511 | Use the current form |
| Payment | Form 511 | Due April 15, 2026 |
Frequently Asked Questions
Answers about Oklahoma personal tax extensions.
The Oklahoma extended filing deadline for the 2025 tax year is October 15, 2026.
Review the Oklahoma instructions to determine whether a federal extension or state request is required.
An extension gives more time to file, not more time to pay; pay the required amount by the original deadline.
Check the Oklahoma revenue or taxation department for current forms and instructions.