Mont. Code § 7-12-4115
In all cities or towns, the city or town council shall have power and it is hereby made the duty of each council (where it is necessary or advisable in connection with any special improvement district to provide, in addition to the construction of the proposed improvements, for repairs to existing facilities or for maintenance of improvements or repairs or for both such repairs and maintenance) to include in the resolution or ordinance creating such special improvement district or providing for assessments to defray the cost of improvements, repairs, and maintenance, a statement showing the allocation of the total amounts, either in dollars and cents or in percentages of said total amounts, to be assessed or assessed to said different purposes: to improvements, to repairs, if any, and to maintenance, if any.
§ 7-12-4115, MCA