Mont. Code § 7-3-4432
Accounting procedures must be devised and maintained for the municipality that are adequate to record in detail all transactions affecting the acquisition, custodianship, and disposition of values, including cash receipts and disbursements. The accounting procedures must conform to the methods and standards provided for in 2-7-504 and Title 7, chapter 6, part 6. The recorded facts must be presented periodically to officials and to the public in summaries and analytical schedules in detailed support of the summaries that may be necessary to show the full effect of the transactions for each fiscal year upon the finances of the municipality and in relation to each department of the municipal government, including distinct summaries and schedules for each publicly owned and operated utility.
§ 7-3-4432, MCA