Mont. Code Ann. § 33-2-312

33-2-312 . Penalty for failure to file statement, pay tax, or pay stamping fee. (1) A surplus lines insurance producer or an insured that independently procured insurance that fails to file the tax and fee statement as required under 33-2-310 or to pay the taxes as required under 33-2-311 is liable for a penalty of up to $25 for each day of delinquency, commencing 30 calendar days after the due date established by the commissioner by rule. The tax and penalty may be recovered in an action instituted by the commissioner in the name of the state in any court of competent jurisdiction with the attorney general representing the commissioner. The penalty when collected, unless collected by a justice's court, must be paid to the commissioner, forwarded to the state treasurer, and placed to the credit of the general fund. The surplus lines insurance producer's license is also subject to revocation as provided in 33-2-313 .

(2) If a surplus lines insurance producer or an insured that independently procured insurance does not pay the stamping fee provided for in 33-2-321 , the commissioner may impose a penalty of 25% of the stamping fee due plus 1.5% a month from the time of delinquency until the stamping fee is paid.