Income Tax | Partnership -- File

The Colorado Department of Revenue offers a free e-file and account service called Revenue Online to file your state income tax. 
However, if you are a first-time Colorado income tax filer, you must file a paper return so the Department can assign a Colorado Account Number (CAN) to you. After the first return is filed, you may create your own User ID and Password to use in Revenue Online (with the CAN assigned by the Department) to e-file future returns free of charge from within your Colorado tax account, and to review your tax account history.