How to Use Colorado Income Tax Calculator Online
Colorado individual income tax is administered by the Colorado Department of Revenue (CDOR) and features a single uniform flat tax rate of 4.40% applied to Colorado taxable income. Under voter-approved Proposition 121 and the state's landmark Taxpayer's Bill of Rights (TABOR), Colorado taxpayers benefit from a streamlined, predictable tax code that automatically incorporates federal standard deductions, statewide paid family leave (FAMLI) withholdings, and localized municipal fees (such as the Denver Occupational Privilege Tax). Try & Tool's Colorado Income Tax Calculator accurately computes your exact state tax liability, FAMLI payroll deductions, IRS federal taxes, FICA withholdings (Social Security & Medicare), and net take-home salary across 5 verified tax years (2022 to 2026).
Enter Gross Salary or Hourly Compensation
Input your gross annual salary or hourly/monthly wage rate and select your pay period (Weekly, Bi-Weekly, Semi-Monthly, Monthly, or Annual).
Select Tax Filing Year & Status
Choose tax years 2022 through 2026 and select your filing status (Single, Married Filing Jointly, Married Filing Separately, or Head of Household) to apply Colorado's conforming federal standard deductions ($15,000 Single / $30,000 MFJ).
Review Colorado 4.40% Flat Tax, FAMLI & FICA Deductions
The engine automatically computes Colorado's 4.40% flat state rate, the 0.45% Colorado FAMLI payroll deduction, and statutory FICA taxes (6.2% Social Security up to $176,100 cap and 1.45% Medicare).
Add Pre-Tax Deductions & Review Net Paycheck
Include 401(k), 403(b), Traditional IRA, HSA, or FSA pre-tax contributions to see your immediate federal and state tax savings and complete paycheck breakdown.
1. Colorado's 4.40% Flat Income Tax Rate & TABOR Mechanisms
Colorado transitioned from a graduated bracket structure to a flat rate system in 1987. In November 2022, Colorado voters passed Proposition 121, permanently lowering the state income tax rate from 4.55% to 4.40% for all individual and corporate taxpayers:
- Uniform 4.40% Rate: Every taxable dollar above allowable deductions is taxed at exactly 4.40%.
- TABOR Revenue Mechanism: Colorado's constitutional Taxpayer's Bill of Rights restricts state government spending growth, frequently triggering tax refund mechanisms or temporary rate reductions (e.g. 4.25%) during revenue surplus years.
- No State Marriage Penalty: Married couples filing jointly enjoy identical flat rate tax treatment with doubled standard deductions.
2. Colorado FAMLI Paid Family Leave Payroll Withholding (0.45%)
Enacted through Proposition 118, the Colorado Family and Medical Leave Insurance (FAMLI) program provides eligible Colorado employees with up to 12 weeks of paid medical and family leave benefits:
- Employee Contribution Rate: 0.45% of gross wages is withheld automatically on employee paychecks.
- Wage Cap Limit: FAMLI deductions apply up to the federal Social Security taxable wage ceiling ($176,100 in 2025; $168,600 in 2024).
- Employer Contribution: Employers with 10 or more employees pay a matching 0.45% share.
3. Colorado Federal Conformance & Standard Deductions
Colorado calculates state income tax starting with Federal Taxable Income from IRS Form 1040 line 15, ensuring complete alignment with federal standard deductions:
- Single Filers & Married Filing Separately: $14,600 (2024) / $15,000 (2025)
- Married Filing Jointly (MFJ): $29,200 (2024) / $30,000 (2025)
- Head of Household (HoH): $21,900 (2024) / $22,500 (2025)
- State Itemized Deductions: If you itemize on federal Schedule A, those itemized deductions flow through to Colorado state returns (subject to high-income state caps above $300k AGI).
4. Denver Occupational Privilege Tax (OPT) & Municipal Head Taxes
While Colorado municipalities are prohibited from enacting percentage-based local wage taxes, several cities levy a monthly flat Occupational Privilege Tax (OPT):
- City and County of Denver: $5.75 per month withheld from employees earning more than $500 monthly in Denver (matched by $4.00/month from employers).
- City of Aurora: $2.00 per month employee OPT (and $2.00/mo employer OPT).
- City of Glendale: $5.00 per month employee OPT.
- Other Cities (Colorado Springs, Boulder, Fort Collins): 0% local head taxes or occupational fees.
5. Colorado Senior / Pension Exemption & Multi-State Comparison
Colorado offers targeted tax exemptions for older residents and maintains a competitive tax posture among Mountain West states:
- Senior Pension Exclusion: Taxpayers age 65 and older can deduct up to $24,000 of pension, annuity, and Social Security benefits per individual annually ($20,000 for ages 55-64).
- vs. Utah (4.65% Flat): Colorado's 4.40% rate is slightly lower than Utah's 4.65% flat rate.
- vs. New Mexico (Up to 5.90%): Colorado offers lower marginal rates for middle and upper-income earners.
- vs. Wyoming (0% State Tax): Wyoming levies no state income tax, creating a $4,400 per $100k gross savings advantage.
Colorado (4.40% Flat) vs. Mountain West States Take-Home Pay Comparison ($100,000 Salary)
| State | State Income Tax Rate | Est. State Tax + FAMLI | Est. Federal & FICA Tax | Total Net Take-Home Pay | Difference vs Colorado |
|---|---|---|---|---|---|
| Colorado (CO) | 4.40% Flat + 0.45% FAMLI | $4,190 | $21,810 | $74,000 | Baseline ($0) |
| Wyoming (WY) | 0.0% (No State Tax) | $0 | $21,810 | $78,190 | +$4,190 in Wyoming |
| Arizona (AZ) | 2.50% Flat Rate | $2,135 | $21,810 | $76,055 | +$2,055 in Arizona |
| Utah (UT) | 4.65% Flat Rate | $3,950 | $21,810 | $74,240 | +$240 in Utah |
| New Mexico (NM) | Graduated up to 5.90% | $4,250 | $21,810 | $73,940 | -$60 vs New Mexico |
| Kansas (KS) | Graduated up to 5.70% | $4,720 | $21,810 | $73,470 | -$530 vs Kansas |