Revising pension laws related to service credit for legislative members

This bill amends Montana's pension laws to clarify how service credit is calculated for state legislators. It ensures that legislative members receive service credit starting from the date they assume office, based on the portion of each year they pay regular contributions. The bill also establishes that retirement benefit calculations will use the plan provisions applicable to the earliest period a member paid contributions, unless they have prior covered employment outside of the legislature. These changes take effect on July 1, 2025, and directly impact current and future members of the Montana Legislature regarding their retirement benefits.