transportation tax; deposit; county board

HB 2106 clarifies how Arizona counties can levy a transportation excise tax approved by voters. It sets a maximum tax rate (up to 20% of existing business tax rates) and specifies where collected revenue must go: counties with over 400,000 residents deposit funds into a regional transportation fund, while smaller counties can choose between that fund or a public transportation authority fund. The tax applies to business transactions, electricity, and natural gas use, and must fund transportation projects in the county. This bill modifies existing tax collection rules but does not create new taxes - only defines how existing voter-approved county taxes operate.