Colorado Payroll Taxes: 2026 Employer Guide
Quick Facts
Key payroll tax details at a glance.
State Income Tax
Flat (up to 4.40%)
SUI New Employer Rate
3.05%
SUI Wage Base
$30,600 per employee
SUI Rate Range
0.72% to 10.85%
Employee SUI Contribution
No
Local Taxes
Yes (Low complexity)
Overview: Colorado Payroll Landscape
Colorado has become one of the top startup hubs in the country, and its payroll environment reflects a growing but still manageable compliance landscape. The flat 4.4% income tax keeps withholding calculations simple. However, the state's FAMLI program, local occupational privilege taxes in cities like Denver, and a relatively high SUI wage base of $30,600 add layers that employers need to track.
This guide breaks down each of Colorado's employer obligations: registration requirements, 2026 tax rates and wage bases, filing deadlines, and the compliance pitfalls that catch expanding startups off guard.
Colorado State Income Tax
Withholding rates, brackets, and forms.
Tax Type
Flat
Top Rate
4.40%
Withholding Form
Federal W-4
Colorado Unemployment Insurance (SUI)
Employer rates, wage bases, and contribution details.
New Employer Rate
3.05%
Wage Base
$30,600 per employee
Rate Range
0.72% to 10.85%
Employee Contribution
—
Colorado State Income Tax Withholding Tax structure: Flat: Colorado applies a flat 4.4% rate on all taxable income. The rate was reduced from 4.55% as part of the state's ongoing rate reduction schedule, down from 4.63% before Proposition 121 passed in 2022. Withholding form: Colorado uses the federal W-4 for state withholding calculations. Colorado conforms to the federal standard deduction. Employers use federal W-4 information to calculate Colorado withholding. What is Colorado SUI? Colorado SUI (State Unemployment Insurance) is an employer-paid tax that funds unemployment benefits for workers who lose their jobs. It is administered by the Colorado Department of Labor and Employment (CDLE). Registration: Employers must register with the Colorado Department of Labor and Employment (CDLE) as soon as they hire their first Colorado employee.
Colorado Additional Employer Taxes
Other state-mandated payroll contributions.
FAMLI (Paid Family and Medical Leave Insurance)
0.9% total (0.45% employer, 0.45% employee)
FAMLI (Paid Family and Medical Leave Insurance) FAMLI (Paid Family and Medical Leave Insurance) Colorado's FAMLI program began collecting premiums in 2023. Employers with fewer than 10 employees are exempt from the employer portion but must still withhold and remit the employee share. Self-employed individuals can opt in.
Colorado Local Taxes
City and county-level tax obligations.
Complexity
Low
Some Colorado municipalities levy an Occupational Privilege Tax (OPT). Denver charges $5.75/month per employee and $4/month from the employer.
Colorado Compliance Checklist
Deadlines, filing requirements, and official resources.
Key Deadlines
Withholding deposits
Due Varies by liability
Quarterly returns (Q1)
Due April 30
Quarterly returns (Q2)
Due July 31
Quarterly returns (Q3)
Due October 31
Quarterly returns (Q4)
Due January 31
Annual reconciliation
Due January 31
W-2 state copies
Due January 31
New hire report
Due Within 20 days of start date
How Warp Handles Colorado Payroll
Warp is the only AI-native HR & Payroll platform built for ambitious companies. Instead of clicking through clunky dashboards or Colorado's .gov websites for taxes, Warp's AI agents open your Colorado tax accounts, file every payroll form, and resolve every tax notice automatically.
What Warp handles for Colorado employers:
- Colorado tax account registration and setup
- Automated income tax withholding calculations and deposits
- SUI registration and quarterly filings
- FAMLI setup and remittance
- Annual W-2 and reconciliation filing
- Tax notice resolution directly with Colorado agencies, so you never spend hours on hold
Every Warp customer gets a dedicated Account Manager and Benefits Advisor included to guide them through payroll setup, multi-state expansion, and benefits selection. You'll never visit a government website, negotiate with tax agencies, or pay an accountant $150 per quarterly filing.
If you don't want to deal with navigating Colorado .gov portals, check out a demo of Warp to see how we can help you stop worrying about compliance and get back to building.
Tax data last verified: March 12, 2026