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Colorado

Register Colorado payroll taxes, assign TPA access, and update accounts for compliant payroll.

Colorado New Business Registration Guide

State Tax Agencies

Types of Tax

  • Withholding Tax
  • State Unemployment Insurance (SUI) Tax
  • Family and Medical Leave Insurance (FAMLI)
  • Local Occupational Privilege Tax (OPT)

Colorado Withholding Tax

Tax Agency: Colorado Department of Revenue

Employers are required to register with the Department of Revenue as a Withholding Tax Agent to withhold state income taxes from employees.

Registration Steps:

1. Register for a Withholding Tax Account

  • If located outside Colorado: Complete and submit Form CR 0100 (Sections A, B, D, E, F, and G).
  • Processing Time: Account number assigned immediately via MyBizColorado or within 4–6 weeks for mailed form.

Colorado Unemployment Insurance (UI) Tax

Tax Agency: Colorado Department of Labor & Employment (CDLE)

Employers must register for unemployment insurance with the CDLE.

Registration Steps:

1. Register for a UI Account Number

2. Assign Third-Party Access (TPA) to Check

  • Navigate to: Account Maintenance > Third Party Administrator Authorization
  • TPA ID: 500003641
  • Assign start date (must be first day of quarter: e.g., 01/01/YYYY).
  • Assign the following roles:
    • View Account Maintenance
    • Submit Employment and Wage Detail
    • View Rate Notice and Voluntary Contribution
    • Edit Tax Payments Update and Submit
  • Save changes.

Colorado Family and Medical Leave Insurance (FAMLI)

Tax Agency: Colorado FAMLI Division (CDLE)

Employers are required to register and submit contributions to the FAMLI program.

Registration Steps:

1. Register for a FAMLI Account

  • Click “Log into My FAMLI+ Employer”
  • Select “Create an account” via login.gov
  • Complete email verification, password setup, and authentication
  • Proceed with registration

2. Assign TPA Access

  1. Log in to your account at Colorado.gov/RevenueOnline.
  1. Click on "Manage My Profile" at the top of the screen.
  1. Click on "More…"
  1. Then click "Grant Third Party Access" in the "Access" box.
  1. Click "Next" on the bottom right of the screen.
  1. Enter the requested information on the "New Third Party Access" screen and click "Submit."
      • You will need the following information:
        • Check's login = Checkhq
        • Access level = ALL ACCESS
        • Access start date = beginning of the first quarter you are running payroll with Check (e.g., Q1 2026 = 1/1/2026).
  1. Verify third party access was granted by clicking "Manage My Profile" → "More…" → "Manage Third Party Access."

Colorado Occupational Privilege Taxes (OPT)

Some Colorado municipalities impose OPT. Registration is required at the city level if you operate in these jurisdictions.

Examples:

Aurora

  • $17 application fee

Denver

Glendale

  • $10 registration fee

Greenwood Village

Sheridan

Update Your Account

Be sure to update your account with:

  • Colorado Withholding Tax Account Number
  • UI Account Number
  • FAMLI Account Number
  • Any applicable local OPT account numbers

All numbers are necessary for timely and accurate payroll tax filings.

Disclaimer

This guide does not contain legal or tax advice. If legal or tax advice is required, an attorney, CPA, or tax adviser should be consulted.

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Last updated on February 28, 2025

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