If any amount of the Gross Production Tax is not paid or remitted within thirty (30) calendar days after the tax becomes delinquent, as set out in 710:45-3-1, a penalty, at the rate of ten percent (10%) of the total amount of the delinquent Gross Production Tax, shall be calculated and collected as part of the delinquent tax. [See: 68 O.S. §217 ]
Okla. Admin. Code § 710:45-3-4