The Tax Division site offers detailed answers and helpful resources. A-Z directory Forms Sales and Use Tax Wage Withholding Tax Business Income Tax Filing Due Dates and Fees Colorado Sales Tax Guide Colorado Withholding Tax Guide Consumer Use Tax Guide Tax Education Webinars Didn't find an answer? Name First Name Last Name Business Name Email Address Email Address Confirm email Daytime Phone Number Colorado Account Number (Sales tax or wage withholding number) Federal Employee Identification Number (FEIN) Description of Concern Send question Leave this field blank Replies are sent within three business days.
