Colorado state income tax
Primary form: DR 0104
State tax in BasilTax: Not yet — federal plus manual state review
Structure: flat
Flat state income tax; verify current rate annually.
Verify your return
Upload your W-2s and 1099s, assign them to a return, and run compute. For states we support end-to-end, BasilTax applies that state’s own rules—brackets, deductions, and the usual quirks—so your state tax lines up with your federal return.