Mont. Code Ann. § 19-13-607

All gifts, bequests, and emoluments given to an employer or member for the benefit of the retirement system or because of any member's service as a firefighter, except when specifically allowed to be retained by the member by the member's employer, must be paid to the board. The board shall deposit them in the pension trust fund. The amounts are employer contributions but are in addition to the amounts required by 19-13-605.