Colorado 2020 State Income Tax Brackets
State income tax rates, brackets, and effective tax calculator
Colorado 2020 Income Tax Brackets
Single Filers
| Rate | Income Over | Up To |
|---|---|---|
| 4.40% | $0 | No limit |
Standard deduction: $15,000
Married Filing Jointly
| Rate | Income Over | Up To |
|---|---|---|
| 4.40% | $0 | No limit |
Standard deduction: $30,000
Note: Flat 4.4% rate. Uses federal standard deduction as starting point. SS benefits partially exempt for seniors.
2020 Federal vs. Colorado State Tax Rates
Federal top marginal rate
37%
Colorado top marginal rate
4.40%
When combined with federal taxes, Colorado residents in the highest bracket face a combined marginal rate of approximately 41.4% on their last dollar of income.
Effective Colorado Tax Rates by Income
Your effective rate is the actual percentage of income paid in state taxes — always lower than the top marginal rate because lower brackets apply to lower portions of income.
| Income | Single — Tax Owed | Single — Effective Rate |
|---|---|---|
| $30,000 | $660 | 2.20% |
| $50,000 | $1,540 | 3.08% |
| $75,000 | $2,640 | 3.52% |
| $100,000 | $3,740 | 3.74% |
| $150,000 | $5,940 | 3.96% |
| $200,000 | $8,140 | 4.07% |
| $300,000 | $12,540 | 4.18% |
| $500,000 | $21,340 | 4.27% |
Estimates based on standard deduction. Does not include local income taxes, credits, or deductions beyond standard.
Key Tax Facts: Colorado in 2020
Sales Tax Rate
2.90%
State rate (local taxes may add more)
Property Tax Rate
0.51%
Effective average rate on home value
Income Tax
Yes
Progressive brackets
Retirement Income
Taxed
Pensions and retirement income taxed
Social Security
Taxed
Social Security benefits taxed at state level
Estate / Inheritance Tax
No
No estate or inheritance tax
Other Tax Years
Federal Brackets by Filing Status (2020)
Other States — 2020 Tax Brackets
Frequently Asked Questions — Colorado State Taxes
Does Colorado have a state income tax?
Yes. Colorado levies a state individual income tax in 2020. The rates and brackets shown above apply to residents filing as single or married filing jointly. Flat 4.4% rate. Uses federal standard deduction as starting point. SS benefits partially exempt for seniors.
How do Colorado tax brackets work?
Like federal taxes, Colorado uses a marginal (progressive) tax system. Only the income within each bracket is taxed at that rate — not all your income. For example, if Colorado has a 5% top rate, you pay 5% only on income above the top bracket threshold, not on your entire salary.
What is the difference between marginal and effective tax rate in Colorado?
Your marginal tax rate is the rate on your highest dollar of income. Your effective tax rate is your total state tax bill divided by your gross income — always lower than your marginal rate. For example, a worker at the top bracket in Colorado may have a marginal rate of 4.4% but an effective rate several points lower due to income in lower brackets.
When were Colorado's tax brackets last updated?
The brackets shown here reflect 2020 rates as enacted by Coloradolegislation and published by the state Department of Revenue. CalcFi updates state tax data annually following each state's legislative session. Data sourced from official state tax agency publications and the Tax Foundation. Last updated: March 2025.