Mont. Code § 20-9-444
When the trustees of a school district are required by law to provide, by a levy of taxes or by certifying the amount of money required or otherwise, a sinking fund or fund required to pay at maturity any bonds issued or created after February 6, 1923, such trustees are jointly and severally liable to the school district which they represent if they fail to perform any duties so required by law, as specified in this section, in an amount equal to the sum which would have been added to such fund had they performed such duty. However, whenever any such board of trustees fails or neglects to perform any such duty, no minority member of the board who moved the board or voted in favor of performance of such duty may be held liable.
§ 20-9-444, MCA