school districts; aggregate expenditure limitation

SB 1636 amends Arizona Revised Statutes § 41-563 to update how cities, counties, and other political subdivisions calculate their annual spending limits under the state constitution. It requires the Commission to determine each subdivision's base limit using 1979-80 revenue data and adjust it yearly based on population growth (using July 1 estimates) and changes in the GDP price deflator. The bill specifies exact formulas for calculating these adjustments, including special rules for annexations, new cities, and county divisions. This directly affects all Arizona local governments subject to constitutional expenditure limits by defining their annual spending caps.