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Colorado Taxes: What You Need to Know

Federal Tax Withholding

Federal tax withholding in Colorado works the same way as it does in other states, as it’s a federal requirement rather than a state-specific one. Here’s a brief overview:

1. Federal income tax is withheld from employees’ paychecks based on information they provide on their W-4 forms.
2. The amount withheld depends on factors like:
   • Employee’s filing status
   • Number of dependents
   • Additional withholding amounts requested
   • Income level
3. Employers use IRS tax tables or payroll software to calculate the correct withholding amount.
4. This withheld money is sent to the IRS, typically on a monthly or semi-weekly basis, depending on the employer’s size.
5. At the end of the year, employers provide employees with W-2 forms showing total wages and the amount of federal tax withheld.

It’s important to note that while the process is the same across states, Colorado employees may need to consider both federal and state tax withholdings when filling out their W-4 forms.

Source: https://www.irs.gov/publications/p15

State and Local Tax Withholding

Colorado employs a straightforward 4.40% flat rate for both individual and corporate income taxes. Some local jurisdictions impose additional income taxes. The state sales tax is set at 2.90%, but when combined with local taxes, the average rate reaches 7.89% in 2026 (up from 7.81%). Property owners face an effective tax rate of 0.50% on their home’s value (up from 0.45%).

The state doesn’t levy estate or inheritance taxes. Motorists pay a gas tax of 22 cents per gallon for gasoline and 20.5 cents per gallon for diesel. Smokers are subject to a $2.24 cigarette tax per pack (increased from $1.94; a further increase to $2.64 per pack is scheduled for July 2027). On average, each Colorado resident contributes $6,387 in state and local taxes. The state carries $11,972 in debt per capita and has funded 71% of its public pension obligations.

Income Tax

• Colorado employs a flat income tax rate of 4.4% for both individuals and corporations.
• This tax applies to all income for Colorado residents.
• Non-residents pay this tax only on income sourced from Colorado.
• Note: A ballot initiative is under consideration for 2026 that could introduce a graduated income tax for higher earners. As of now, the flat 4.4% rate remains in effect.

Sales Tax

• The state of Colorado imposes a base sales tax rate of 2.9%.
• Local jurisdictions can add their own sales taxes, which vary by location.
• The average combined state and local sales tax rate is 7.89% in 2026 (previously 7.81%).
• In some areas, the combined state and local sales tax rate can exceed 8%.

Property Tax

• Colorado’s property taxes are among the lowest in the United States.
• The effective average property tax rate is 0.50% of a home’s assessed value (up from 0.45%).
• Property tax rates can vary significantly depending on the specific county, city, or school district.

Specific Taxes

• Colorado levies a gasoline tax of 22 cents per gallon. Diesel is taxed at 20.5 cents per gallon.
• The cigarette tax is $2.24 per pack (increased from $1.94; a further increase to $2.64 per pack is scheduled for July 2027).
• Marijuana is subject to a 15% excise tax and an additional 15% sales tax for recreational use.

Tax Filing

• Colorado residents are required to file their state tax returns using Form 104 on an annual basis.
• Taxpayers may need to make regular withholdings or estimated tax payments throughout the year.

Source: Colorado Department of Revenue – Individual Income Tax: https://tax.colorado.gov/individual-income-tax

FICA & State Insurance Taxes in Colorado

Social Security Tax

• The Social Security tax rate is 6.2% of an employee’s wages up to the wage base limit.
• In 2026, the wage base limit for Social Security tax is $184,500 (increased from $160,200).
• Both employers and employees contribute 6.2%, totaling a 12.4% contribution.

Medicare Tax

• The Medicare tax rate is 1.45% of an employee’s wages with no wage base limit.
• Employees earning over $200,000 (single) or $250,000 (joint) pay an additional 0.9% Medicare tax on excess wages.
• Employers match the 1.45% but not the additional 0.9%, resulting in a total contribution of 2.9% for most employees.

Colorado State Insurance Taxes

Unemployment Insurance (UI) Tax

• Employers in Colorado pay UI tax to fund unemployment benefits for displaced workers.
• UI tax rates for employers range from 0.81% to 12.34% in 2026, with new employers generally starting at 3.05%.
• The 2026 taxable wage base for UI in Colorado is $30,600 per employee (increased from $20,400 in 2023).

Workers’ Compensation Insurance

• Most Colorado employers must carry workers’ compensation insurance to cover work-related injuries.
• Employers pay the full premium for workers’ compensation, which is not deducted from employee wages.
• Insurance rates depend on the employer’s industry, payroll, and claims history.

State Disability Insurance

• Colorado does not have a mandatory state disability insurance program.
• Employers may offer private disability insurance, but it’s not required by state law.
• Note: Beginning in 2026, certain Family and Medical Leave Insurance (FAMLI) benefit payments for employees at employers with more than 10 employees will be subject to FICA and FUTA taxes. FAMLI will manage withholding of the employee portion.

Source: https://cdle.colorado.gov/employers/unemployment-insurance

Common Pre-Tax Deductions

• Medical Insurance: Premiums for employer-sponsored health, dental, and vision plans are typically deducted pre-tax.
• Health Savings Accounts (HSAs): Contributions are pre-tax. The HSA contribution limits for 2026 are $4,400 for self-only coverage and $8,750 for family coverage (up from $4,150 and $8,300 in 2024). Those 55 and older can contribute an additional $1,000 as a catch-up contribution.
• Flexible Spending Accounts (FSAs): Healthcare FSAs allow up to $3,400 annually (up from $3,200).
• Retirement Plans: 401(k), 403(b), and 457 plans allow pre-tax contributions up to $24,500 annually (up from $22,500). Those age 50 or older can contribute up to $32,500 (catch-up limit increased to $8,000). Employees aged 60–63 benefit from an enhanced catch-up limit of $11,250, for a total of $35,750.
• Commuter Benefits: Up to $300 monthly for parking and $300 for public transit or vanpooling.
• Group-Term Life Insurance: Employer-provided coverage up to $50,000 is usually pre-tax.
• Dependent Care Assistance Program (DCAP): Allows up to $5,000 annually for dependent care expenses.

Tax Benefits

• Pre-tax deductions reduce taxable income for federal, Colorado state (4.4% flat rate), and often FICA taxes.
• This results in lower overall tax liability and increased take-home pay for employees.

Source: https://www.irs.gov/newsroom/401k-limit-increases-to-24500-for-2026-ira-limit-increases-to-7500

Median Household Income in Colorado

According to the latest U.S. Census Bureau data, Colorado’s median household income reached $106,500 in 2024 — a record high, and an increase from the previously cited ~$84,400 (2022 estimate). Colorado led the nation with the fastest-growing median household income from 2019 to 2024, rising 46.9%.

Colorado Tax Brackets 2026

For 2026, Colorado maintains a flat income tax rate system. This means that all taxpayers, regardless of their income level, are taxed at the same rate. Here’s the comprehensive breakdown:

Colorado Income Tax Rates 2026

Wrapping Up

Colorado keeps taxes refreshingly simple — a flat 4.40% state rate means no bracket guessing, just straightforward math. The bigger wins come from making the most of your pre-tax benefits like your 401(k), HSA, and FSA, which trim your taxable income at both the federal and state level. A few things shifted for 2026 — higher contribution limits, a new Social Security wage base, and updated UI rates — so it’s worth a quick review of your withholdings to make sure everything still lines up. When in doubt, a tax professional can help you fine-tune the details.