Mont. Code Ann. § 7-12-4229

Any funds without interest deposited in the revolving fund under 7-12-4169 (2) less the amount of any loan to the district fund not repaid may be returned to the owners of record of the property of the district in direct proportion of the original assessment on each piece of property, or as an alternative a municipality may transfer the funds placed in the revolving fund as a result of 7-12-4169 (2) to the general fund after the final payment of the district's bonds or warrants is paid.