Okla. Admin. Code § 710:55-4-123
If a refund is not issued within twenty (20) days of the filing, the Commission shall pay interest from the day of the filing of a processible claim for the refund until the date on which the refund is made. The "date of filing of the claim" means the date the refund claim is received by the Commission. The "date on which the refund is made" means the date on which a refund check is issued. To be "processible", all information on the refund claim, including the computations, must be correct and all required documentation must be attached.
Added at 14 Ok Reg 1083, eff 1-24-97 (emergency)
Added at 14 Ok Reg 2346, eff 6-12-97
Amended at 19 Ok Reg 2440, eff 6-27-02