Okla. Stat. tit. 68, § 68-2374: Interest

In the case of any refund to a taxpayer as provided in Section

226 of the Uniform Tax Procedure Code for taxes collected pursuant

to this act, the Tax Commission shall pay interest thereon at the

rate of six percent (6%) per annum from the date of payment by the

taxpayer to the date of such refund. To the extent inconsistent

herewith, Section 226 of the Uniform Tax Procedure Code is hereby

superseded.