Colorado charges 4.4% flat state income tax. Use the quarterly tax estimator pre-loaded with Colorado rates.
Open Quarterly Tax Estimator →Quarterly estimated payments in Colorado must cover both your federal and state obligations. Colorado applies a flat 4.4% rate, and most states require their own quarterly payment schedule that may differ from the IRS dates. This estimator pre-loads Colorado's tax rates so you can calculate both federal and state quarterly amounts in one place, avoiding underpayment penalties at both levels.
Colorado levies a flat 4.4% state income tax on all taxable income regardless of how much you earn. This makes tax planning straightforward: for every additional dollar you earn, 4.4 cents goes to Colorado. Colorado does not impose local income taxes, so the 4.4% flat rate is the only state-level income tax you owe.
The table below shows what you actually keep at five salary levels in Colorado, accounting for federal tax, FICA, and Colorado's flat 4.4% state tax.
See how Colorado compares to other West states. Each link takes you to the quarterly tax estimator landing page for that state.
For a comprehensive breakdown of Colorado’s tax structure, salary comparisons, cost-of-living analysis, and more, visit the full Colorado take-home pay page.