The Number That Changes Everything: Property Taxes
Most Chicago-to-Denver comparisons focus on housing prices. They should focus on property taxes. Illinois has one of the highest effective property tax rates in the country at approximately 2.0–2.3%. Colorado's effective rate is approximately 0.5–0.6%. On a $600,000 home, that difference is $8,700–$10,200 per year — or $725–$850 per month. That's a mortgage payment in many markets.
Side-by-Side Cost Comparison
| Category | Chicago | Denver | Winner |
|---|---|---|---|
| Property Tax Rate | ~2.0–2.3% | ~0.5–0.6% | Denver |
| State Income Tax | 4.95% flat | 4.4% flat | Denver |
| Estate Tax | Yes ($4M+) | None | Denver |
| Sales Tax (city) | ~10.25% | ~8.81% | Denver |
| Urban Condo (comparable) | $420K–$650K | $380K–$600K | Denver |
| Average 1BR Rent | $2,100–$3,200 | $1,800–$2,800 | Denver |
| Groceries (index) | 107 | 102 | Denver |
| Utilities | Lower | Slightly Higher | Chicago |
The Real Bottom Line
For most Chicago-to-Denver movers, total monthly cost of comparable housing is 15–25% lower in Denver when property taxes are fully accounted for. Over a 10-year holding period on a $600K property, cumulative tax savings exceed $60,000. That's a compelling financial argument independent of lifestyle preferences.
Does Colorado have an inheritance or estate tax?
No. Colorado has neither an estate tax nor an inheritance tax. Illinois has an estate tax that applies to estates over $4 million. For buyers with significant assets thinking about long-term wealth transfer, this difference is meaningful.
How do Colorado income taxes work for relocated employees?
Colorado has a flat income tax rate of 4.4%. Illinois is flat at 4.95%. In the year of your move, you'll file partial-year returns in both states. Work with a CPA familiar with multi-state moves for your first Denver tax year.
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