school districts; aggregate expenditure limitation.

HB 2637 updates Arizona's method for calculating annual spending limits for cities, counties, and other local governments (not school districts, as the title suggests). It requires the state commission to determine each jurisdiction's expenditure limit using a formula based on population changes since 1979 and inflation adjustments (GDP price deflator), with annual reports to local governing boards. The bill includes specific rules for adjusting limits when jurisdictions annex new areas, split, or form new cities or counties. This directly affects all Arizona political subdivisions subject to the state's constitutional spending cap, ensuring their annual budgets reflect population growth and inflation. The changes apply to how these limits are calculated and reported each year.