Okla. Stat. tit. 36, § 6418
Each member insurer shall use the filed and approved rate for the liability and homeowners' insurance being written or those rates effective by Section 924 of this Code. Any variance from such rate, including a variance based upon debit, shall be approved prior to use, by the State Board for Property and Casualty Rates.
Laws 1986, c. 251, § 51, emerg. eff. June 13, 1986.