Okla. Stat. tit. 68, § 1205

A. In determining the amount of tax to be levied, assessed and collected under the terms of this Article, the maximum amount shall not exceed Twenty Thousand Dollars ($20,000.00). B. If, as a result of the computation of tax required by Section 1209 of this title, the resulting liability is Two Hundred Fifty Dollars ($250.00) or less, the corporation or other entity shall be exempt from the tax levied by Section 1203 or Section 1204 of this title for such reporting period.