Mont. Code Ann. § 19-20-202

The members of the retirement board shall serve without direct or indirect compensation except that each appointed member shall receive compensation as provided in 2-15-122 and travel expenses as provided in 2-18-501 through 2-18-503 for each day in attendance at the meetings of the board or in the execution of duties as a member of the retirement board. All per diem and expenses paid under the provisions of this section must be paid from the expense account of the retirement system.