(1) As required by 20-9-212 , MCA, county treasurers shall invest, within three days of receipt, money received in the elementary and high school county equalization funds, the county levies in support of district retirement obligations, and the county levy in support of transportation schedules. The taxes must remain invested until one working day before they are distributed to school districts within the county or remitted to the state.

(2) County treasurers shall allocate proportionately to, and deposit investment income received, in the funds established to account for elementary and high school county equalization, the county levies for retirement, and the county levy for transportation.