Concerning participation in the public employees' retirement system judicial benefit multiplier program by commissioners of the supreme court and court of appeals.

HB 1510 expands Washington's judicial retirement benefit program to include supreme court and court of appeals commissioners, who were previously excluded. It allows current commissioners to elect a 1.5% annual benefit multiplier for future service (effective 2026) and permits past commissioners to retroactively purchase higher benefits for prior service (2028 window), subject to a 75% cap on total benefits. Commissioners must pay 5% of salary plus 5.5% interest for retroactive purchases, with costs limited to the actuarial value of the increased benefit. This applies to members of the Public Employees' Retirement System (PERS) under Plans 1 or 2.