Colorado (CO) Paycheck Calculator

Colorado has a flat income tax rate of 4.4% for 2026. The rate applies to federal taxable income — the same figure from Line 15 of your federal Form 1040, which already reflects the federal standard deduction and pre-tax benefit deductions. Source: Colorado Department of Revenue (tax.colorado.gov).

Colorado starts from your federal taxable income (after the federal standard deduction and pre-tax deductions like 401k and HSA), then applies its own adjustments. For most W-2 employees with no Colorado-specific modifications, the Colorado tax base is effectively the same as federal taxable income. Colorado does not have a separate state standard deduction because the federal standard deduction is already baked into the starting point.

Yes. Colorado's TABOR provision can trigger temporary rate reductions in years when state revenue exceeds the cap. The current rate is 4.4% as published by the Colorado Department of Revenue. If a TABOR refund applies in a given tax year, the effective rate may be lower — check tax.colorado.gov for the current year's rate before relying on withholding estimates for actual filing.

Yes. Since Colorado's tax base is federal taxable income, any deduction that lowers your federal taxable income (such as traditional 401k contributions) also lowers your Colorado tax. A 6% 401k contribution on an $80,000 salary reduces federal taxable income by $4,800, saving an additional $211 in Colorado income tax (4,800 × 4.4%).

This calculator uses the IRS Publication 15-T percentage method (annualized wages, post-2020 W-4). Your annual salary is reduced by any pre-tax deductions you enter, then by the federal standard deduction for your filing status. The resulting federal taxable income is run through the 2026 federal income tax brackets to get the annual withholding, which is divided by your pay periods.

Social Security is 6.2% of your gross wages up to the 2026 wage base of $184,500. Medicare is 1.45% of all wages with no cap. High earners (above $200,000 for single filers, $250,000 for married filing jointly) also owe an Additional Medicare surtax of 0.9% on wages above that threshold. These are the employee shares; your employer pays a matching amount separately.

Yes. Traditional 401(k) contributions reduce your federal taxable income (and therefore your federal income tax withholding). They also reduce the tax base in most states, including Colorado. Roth 401(k) contributions are post-tax and do not reduce current-year tax.

This calculator covers federal income tax, FICA (Social Security + Medicare), and Colorado state income tax. It does not include: Excludes Colorado local taxes and any TABOR-triggered temporary rate adjustments that may apply in a given year. SDI is not applicable in Colorado. It is an estimate for budgeting purposes — your employer's actual payroll system and your W-4 elections determine your exact withholding.

Your marginal tax rate is the rate that applies to your last dollar of income (the highest bracket you fall into). Your effective tax rate is your total taxes divided by your gross salary — it is always lower than your marginal rate because lower income is taxed at lower bracket rates. The effective rate shown here includes federal income tax, FICA, and state income tax.