Mont. Code Ann. § 15-36-311 — Quarterly Payment Of Tax -- Statement -- Failure To Pay Penalty

15-36-311 . Quarterly payment of tax -- statement -- failure to pay penalty. (1) The oil and natural gas production tax must be paid in quarterly installments for the quarterly periods ending, respectively, March 31, June 30, September 30, and December 31 of each year, and the amount of the tax for each quarterly period must be paid to the department within 60 days after the end of each quarterly period.
(2) The operator shall complete on forms prescribed by the department a statement showing the total number of barrels of merchantable or marketable oil or cubic feet of natural gas produced and sold by the person in the state during each month of the quarter and during the whole quarter, the average value of the production sold during each month, and the total value of the production sold for the whole quarter, together with the total amount due as taxes for the quarter. The statement must be filed within the time provided in subsection (1). The statement must be accompanied by the tax due. The statement must be signed by the individual or the president, vice president, treasurer, assistant treasurer, or authorized agent of the association, corporation, joint-stock company, or syndicate making the statement. A person engaged in carrying on business at more than one place in this state or owning, leasing, controlling, or operating more than one oil or gas well in this state may include all operations in one statement.
(3) If the tax is not paid on or before the due date, there must be assessed penalty and interest as provided in 15-1-216 . The department may waive any penalty pursuant to 15-1-206 .