business income; corporate tax; allocation

HB 2491 modifies Arizona's corporate tax calculation method for businesses operating across state lines. It changes how taxable income is apportioned between states, gradually shifting from a formula balancing property, payroll, and sales factors to using *only* the sales factor for most businesses starting in 2016 (through 2026). This directly affects corporations with operations in multiple states, as it increases the weight of sales activity within Arizona for tax purposes. The bill specifies different calculation formulas for various time periods, with the 2016-2026 period requiring businesses to use the sales factor alone to determine Arizona tax liability.