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.
Okla. Admin. Code § 710:55-4-123