Establishes a spending cap and increases the maximum capacity of the rainy day fund

This bill establishes a new annual spending growth cap for state operating funds, directly affecting the governor and legislature when creating budgets. The cap limits yearly increases in state spending to the average inflation rate from the prior three years (calculated using the Consumer Price Index). It requires the governor to certify budget compliance and gives the comptroller authority to verify limits, with exceptions only for emergencies declared by the governor and approved by a two-thirds legislative vote. The bill does not change the rainy day fund's capacity, as the title's mention of that detail isn't elaborated in the actual provisions.