Oklahoma business filing due dates
The Oklahoma deadlines Ordexly tracks for Oct 2026 to Oct 2027. Every date links to the agency page it was checked against (last checked ). Which ones apply to a business depends on its registrations and filing frequency, so confirm with the agency.
Annual report based on formation date
Oklahoma LLC Annual Certificate (anniversary). OK SOS FAQ — LLC annual certificate on anniversary; corp confirm held Official source.
Ordexly works out this date for each business from its formation month.
Sales & use tax
| Due | Deadline | Source |
|---|---|---|
| Oklahoma sales tax return (monthly filers) October 2026 | official source | |
| Oklahoma sales tax return (monthly filers) November 2026 Moved from Sun, Dec 20 (weekend). | official source | |
| Oklahoma sales tax return (monthly filers) December 2026 | official source | |
| Oklahoma sales tax return (monthly filers) January 2027 Moved from Sat, Feb 20 (weekend). | official source | |
| Oklahoma sales tax return (monthly filers) February 2027 Moved from Sat, Mar 20 (weekend). | official source | |
| Oklahoma sales tax return (monthly filers) March 2027 | official source | |
| Oklahoma sales tax return (monthly filers) April 2027 | official source | |
| Oklahoma sales tax return (monthly filers) May 2027 Moved from Sun, Jun 20 (weekend). | official source | |
| Oklahoma sales tax return (monthly filers) June 2027 | official source | |
| Oklahoma sales tax return (monthly filers) July 2027 | official source | |
| Oklahoma sales tax return (monthly filers) August 2027 | official source | |
| Oklahoma sales tax return (monthly filers) September 2027 | official source |
Payroll & withholding
| Due | Deadline | Source |
|---|---|---|
| Oklahoma WTH-10001 withholding return (quarterly) Q4 2026 | official source | |
| Oklahoma WTH-10001 withholding return (quarterly) Q1 2027 | official source | |
| Oklahoma WTH-10001 withholding return (quarterly) Q2 2027 | official source | |
| Oklahoma WTH-10001 withholding return (quarterly) Q3 2027 | official source |
Unemployment / reemployment
| Due | Deadline | Source |
|---|---|---|
| Oklahoma UI OES-3 Q3 2026 | official source | |
| Oklahoma UI OES-3 Q4 2026 | official source | |
| Oklahoma UI OES-3 Q1 2027 | official source | |
| Oklahoma UI OES-3 Q2 2027 | official source |
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Nearby: Arkansas due dates · Colorado due dates · Kansas due dates · Missouri due dates · New Mexico due dates · Texas due dates
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