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Colorado

Register your new business in Colorado with essential tax guidelines and agency links.

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

  • Navigate to: Manage My Accounts > Manage Accounts
  • Scroll to Third-Party Administrator section
  • Search for and select “Check Technologies, Inc.”
    • TPA FEIN: 834490700
  • Enter start date (first day of quarter) and confirm

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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