Okla. Admin. Code § 710:45-15-6
The operators of reclaiming plants, including disposal facilities, shall be required to remit the gross production and petroleum excise taxes on all oil coming into their possession except where such taxes have previously been paid or when it can be shown that such oil was not subject to tax for reason of being exempt by law or having been produced in another state. Taxes shall be due on oil purchased by a reclaimer on the first day of the month following the month of purchase. Taxes shall be due on oil recovered from water at a disposal facility the first day of the month following the month it was sold by the reclaimer who recovered it. The tax shall become delinquent if not received by the Tax Commission on or before the twenty-fifth (25th) day of the second month in which it became due. Reclaimer's Monthly Gross Production Tax Report (OTC Form 341) and Reclaimer's and Transporters Monthly Tax Report of Oil Transported, Stored and Sold (OTC Form 323-A) are due on the same date as the tax and shall be delinquent if not received by the twenty-fifth (25th) day of the second month following the month in which it becomes due.
Okla. Admin. Code § 710:45-15-6