Mont. Code § 7-14-1131
Subject to 15-10-420, the port authority may request annually from the governing bodies the amount of tax to be levied by each municipality participating in the creation of the port authority, and the municipality may levy the amount requested, pursuant to provisions of law authorizing cities and other political subdivisions of this state to levy taxes. The municipality shall collect the taxes requested by a port authority that it has authorized in the same manner as other taxes are levied and collected and make payment to the port authority. The proceeds of the taxes when and as paid to the port authority must be deposited in a special account or accounts in which other revenue of the authority is deposited and may be expended by the authority as provided for in this part. Prior to the issuance of bonds under 7-14-1133 and 7-14-1134, the port authority or the municipality may by resolution covenant and agree that the total amount of taxes then authorized by law, or the portion of the taxes that may be specified by the resolution, will be requested, levied, and deposited annually as provided in this section until the bonds and interest are fully paid.
§ 7-14-1131, MCA