A cost of living comparison using tax-adjusted purchasing power data.
Here's the result most people don't expect: on a purely financial basis, moving from Chicago to Denver and keeping the same salary actually leaves you slightly worse off. Denver's cost of living index (127) is 7.6% higher than Chicago's (118), and while Colorado's income tax is a bit lower than Illinois's (4.4% vs 5.2%), that 0.8 percentage point tax savings doesn't close the COL gap. On a $90,000 salary, your Denver purchasing power is roughly equivalent to $84,000 in Chicago — about a 6.3% reduction. This isn't a disaster, but it does mean the "cheaper Denver" narrative you might have heard is out of date.
| Category | Chicago | Denver | Difference |
|---|---|---|---|
| Overall COL Index | 118 | 127 | +7.6% |
| Median 1BR Rent | ~$1,700/mo | ~$1,800/mo | +6% |
| State Income Tax | 5.2% | 4.4% | −0.8 pp |
At $60,000: keeping that salary in Denver gives you purchasing power equivalent to about $56,000 in Chicago. At $90,000: equivalent to about $84,000 in Chicago. The tax savings are real but modest — you're saving roughly $720/year on taxes at a $90k salary by moving from Illinois to Colorado. Meanwhile, Denver's higher cost of living costs you more than that difference every month in rent and everyday expenses.
Chicago's COL index of 118 is actually below the national average in a meaningful way — it's a large city that has remained relatively affordable. Denver's rapid population growth over the past decade has driven its COL index up significantly, and it hasn't come down.
The financial case for Chicago→Denver is weak on the numbers alone. Most people making this move are doing it for lifestyle reasons — outdoor access, climate, proximity to mountains — and accepting a modest financial step backwards in exchange. That's a perfectly reasonable tradeoff; it just helps to go in clear-eyed that Denver isn't the bargain it was sold as.
If you're moving for a specific job offer at a higher salary, obviously run the numbers on your actual new income rather than assuming parity. Denver's tech and energy sectors can generate strong salaries. But if you're planning a lateral move or remote work at the same pay, expect your monthly budget to feel slightly tighter, not looser.
Denver has a solid, diversified economy — energy, aerospace, tech, healthcare, and government all have meaningful presence. It's not a one-industry town. Lockheed Martin, Raytheon, and a cluster of aerospace companies make it a real destination for engineers in that field. The tech scene is real but smaller than coastal hubs. For most white-collar industries, Denver offers employment options; salaries typically run below Chicago equivalents, which further complicates the financial picture if a local job search is part of the plan.
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