All Colorado State offices will closed Wednesday, June 19, 2024 in observance of Juneteenth. To see a list of State closures, please visit


Business Income Tax | File Online

Businesses can file their return online through Revenue Online. However, if you are a first-time Colorado income tax filer, you must file a paper return or through an accepted tax software program. After your first tax return is processed, you may create your own Login ID and Password to use in Revenue Online. For more information, review the E-Filer Handbook or visit the Online Services webpage.

Business Income Tax Services in Revenue Online

Login Required

  • File/amend income tax returns
  • Check your refund status
  • View payment history
  • View account balances
  • View letters from the Department
  • Update your account mailing address
  • Set up Third Party access to your tax account (Instructions)

No Login Required

  • Submit E-Filer Attachments for income tax returns (Instructions)
  • File a protest
  • Add Power of Attorney
  • Make a payment

How-To Videos


How To Set Up Your Revenue Online Account

Username Recovery & Password Reset


How to Request a Letter ID