Mont. Code Ann. § 7-4-2207

It is the duty of all officers to complete the business of their respective offices prior to the time of the expiration of their respective terms. If any officer, at the close of the term, leaves to the officer's successor official labor to be performed for which the officer has received compensation or that it was the officer's duty to perform, the officer is liable to pay to the successor the full value of the services, which may be recovered in any court of competent jurisdiction upon action brought against the officer on the officer's official bond.