Compare taxes and see how much you save moving from Colorado to Arizona
Colorado has a flat 4.4% income tax rate (TABOR protected), while Arizona charges a flat 2.5% rate (lowest income tax state in America). Living in Arizona saves $1,900/year on $100k income compared to Colorado. However, Colorado has lower property taxes (0.49% vs AZ's 0.60%) and slightly lower sales tax (7.77% vs 8.37%). Overall, Arizona offers better tax advantages for high earners, while Colorado wins on property taxes and lifestyle. The Denver-Phoenix corridor sees significant bidirectional migration.
Flat Rate
Flat 4.4% (TABOR protected)
Flat Rate
Flat 2.5% (lowest income tax state)
At $100,000 income:
That is $158/month back in your pocket!
| Income | CO Tax | AZ Tax | Savings | 10-Year |
|---|---|---|---|---|
| $50,000 | $2,200 | $1,250 | $950 | $9,500 |
| $100,000 | $4,400 | $2,500 | $1,900 | $19,000 |
| $200,000 | $8,800 | $5,000 | $3,800 | $38,000 |
| $500,000 | $22,000 | $12,500 | $9,500 | $95,000 |
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Moving between Colorado and Arizona? Multi-state returns are tricky—different flat tax rates, partial-year residency. Get matched with a CPA who specializes in Mountain West state moves.
⚠ Not for simple single-state returns. Free filing is fine for straightforward W-2 situations.
Get Matched With a CPA →On $100,000 income, Arizona saves $1,900/year in income tax (AZ 2.5% vs CO 4.4%). AZ also has cheaper housing (Phoenix 22% cheaper than Denver). However, AZ property tax is slightly higher (0.60% vs CO 0.49%). On a $500k home, AZ pays $3,000/year vs CO $2,450/year—difference of $550/year. Net savings: $1,350/year. Over 10 years: $13,500. Plus 18% lower cost of living in Phoenix.
2021 tax reform flattened AZ's progressive system to 2.5% flat rate (fully implemented by 2023). Goal: compete with Texas/Florida/Nevada for migration. Now AZ has lowest income tax of any state WITH income tax. Combined with low property tax (0.60%) and no extreme weather premiums, AZ is extremely competitive. Colorado's 4.4% is TABOR-protected (constitutional limit), can't easily change.
Yes, heavy bidirectional flow. In 2023, 18,472 people moved CO → AZ and 14,204 moved AZ → CO (net: AZ gained 4,268). Migration drivers CO → AZ: lower taxes ($1,350/year savings), lower cost of living (18% cheaper), mild winters, retirees escaping snow. Migration drivers AZ → CO: four seasons, skiing, better schools, quality of life, escaping extreme heat.
Colorado wins for quality of life: four seasons, skiing, outdoor recreation, better schools (#17 vs #40), Denver tech culture. Arizona wins for: lower taxes ($1,900/year savings at $100k), lower cost of living (18% cheaper), mild winters, no snow. Both have strong tech scenes. Choose CO for lifestyle/outdoors. Choose AZ for tax savings/affordability.