1099 Tax Calculator Colorado 2026
Colorado has a flat 4.4% individual income tax rate using the federal standard deduction as a starting point. Self-employed workers and 1099 contractors in Colorado owe state tax in addition to federal income tax (10-37%) and self-employment tax (15.3% on net earnings). Use the calculator below to estimate your 2026 total tax liability and quarterly estimated payments.
Net income after business expenses
Enter your income to see your tax breakdown
How Colorado taxes self-employment income
Colorado has a flat 4.40% state income tax.
Colorado has a flat 4.4% individual income tax rate. The state uses the federal standard deduction. Rate may be temporarily reduced via the state's TABOR refund mechanism in some years.
Federal tax also applies
Regardless of state, all 1099 contractors and self-employed workers in Colorado owe federal income tax and self-employment tax. SE tax is 15.3% on net earnings (12.4% Social Security up to $184,500 in 2026, plus 2.9% Medicare with no cap). Federal income tax follows the standard bracket structure (10-37%).
The calculator above includes federal, SE, and Colorado state tax in one estimate, and breaks down quarterly estimated payments due April 15, June 15, September 15, 2026, and January 15, 2027.