AZ HB2603

Imposes a vehicle mileage tax of 1 cent per mile on electric vehicles driven on highways in Arizona, in addition to all other applicable taxes.

Requires the Arizona Department of Transportation to collect the tax and adopt implementing rules.

Establishes automatic annual tax rate increases based on the average annual percentage increase in the GDP price deflator for the two most recent complete state fiscal years, adjusted by December 31 each year.

Defines "electric vehicle" as a vehicle powered by a motor using electrical energy from rechargeable batteries or external sources that cannot be powered by motor vehicle fuel.

Requires a two-thirds affirmative vote of both houses of the legislature for enactment, with immediate effect upon gubernatorial signature or three-fourths legislative override of a veto.