Arizona
Moderate tax burden · COL index 102
Wins 7 categories
Colorado
Moderate tax burden · COL index 110
Wins 8 categories
Colorado's top income tax rate is 4.4% vs Arizona's 2.5%. The median home in Colorado costs $545K vs $420K in Arizona. Politically, Arizona voted Republican in 2024 (R+5.0) while Colorado went Democratic (D+11.0).
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Category wins
7
Arizona
8
Colorado
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Colorado uses a flat 4.40% state income tax; Arizona uses a flat 2.50% state income tax. Average combined state + local sales tax rates are broadly comparable: roughly 7.81% in CO and 8.38% in AZ (mid-year 2025 estimates).