Arizona Lawmakers Approve ‘Unprecedented’ Flat Income Tax Plan

Sweeping tax cuts approved by Arizona lawmakers Thursday would transition the state to a flat income tax and insulate high earners from a voter-approved tax increase—a controversial move that leaders are touting as the biggest tax cut in state history.

Arizona would join states such as Colorado and Kentucky with flat income taxes under the suite of budget bills (S.B. 1828 and S.B. 1827) supported by Gov. Doug Ducey (R). The party-line passage by both chambers of the state Legislature follows weeks of controversy over a tax cut estimated at $1.9 billion when fully implemented and its impact ...