Okla. Stat. tit. 68, § 1101

A. Prior to July 1, 2026, and as provided in Section 1103.1 of this title, there is hereby levied, in addition to the gross production tax, an excise tax equal to ninety-five one thousandths of one percent (.095 of 1%) of the gross value on each barrel of petroleum oil produced in this state which is subject to gross production tax in this state. Such excise tax of ninety-five one thousandths of one percent (.095 of 1%) of the gross value shall be reported to and collected by the Tax Commission at the same time and in the same manner as is provided by law for the collection of gross production tax on petroleum oil. On petroleum oil sold at the time of production, the excise tax thereon shall be paid by the purchaser, who is hereby authorized to deduct in making settlement with the producer and/or royalty owner the amount of tax so paid; provided, that in the event oil on which such tax becomes due is not sold at the time of production, but is retained by the producer, the tax on such oil not so sold shall be paid by the producer including the tax due on royalty oil not sold; and provided, further, that in settlement with royalty owner, such producer shall have the right to deduct the amount of tax so paid on royalty oil, or to deduct therefrom royalty oil equivalent in value at the time such tax becomes due with the amount of tax paid. The provisions of this subsection shall terminate on June 30, 2026. B. Beginning on July 1, 2026, there is hereby levied, in addition to the gross production tax, an excise tax equal to eighty- five one thousandths of one percent (.085 of 1%) of the gross value on each barrel of petroleum oil produced in this state which is subject to gross production tax in this state. Such excise tax of eighty-five one thousandths of one percent (.085 of 1%) of the gross value shall be reported to and collected by the Tax Commission at the same time and in the same manner as is provided by law for the collection of gross production tax on petroleum oil. On petroleum oil sold at the time of production, the excise tax thereon shall be paid by the purchaser, who is hereby authorized to deduct in making settlement with the producer and/or royalty owner the amount of tax so paid; provided, that in the event oil on which such tax becomes due is not sold at the time of production, but is retained by the producer, the tax on such oil not so sold shall be paid by the producer including the tax due on royalty oil not sold; and provided, further, that in settlement with royalty owner, such producer shall have the right to deduct the amount of tax so paid on royalty oil, or to deduct therefrom royalty oil equivalent in value at the time such tax becomes due with the amount of tax paid.