Mont. Code Ann. § 17-8-305

The state treasurer may establish a cost accounting system to determine the unit cost of issuing and processing warrants and provide for a system of charges for services rendered in issuing and processing warrants for claims submitted by any department or agency of the state. Funds collected for operation of the state warrant system must be deposited to the credit of an internal service fund and expended for the purposes of paying the processing expenses incurred as a result of the state warrant system.