corporate tax; business income; allocation

SB 1575 changes how Arizona businesses calculate their state corporate tax liability by adjusting the formulas used to allocate income between states. For most businesses, it offers two apportionment methods (using property, payroll, and sales factors) that gradually increase the weight given to sales factor over time, shifting toward a model where sales location determines tax responsibility. The bill specifically modifies rules for service sales, requiring businesses to increasingly base tax on where customers are located (market sales) rather than where work is performed, with a full transition to market-based sales starting in 2026. This directly affects corporations operating in Arizona with income from multiple states, particularly those providing services or selling intangible goods.