Related Information
Question: Where to Mail Tax Forms?
The Colorado Department of Revenue has consolidated and expanded its online services into a interface called Revenue Online. Revenue Online will allow you to view your tax account history and file returns for the following taxes:
  • Individual Income Tax
  • Corporate, Partnership, and Fiduciary Income Taxes
  • Sales Tax
  • Retailers Use
  • Consumer Use
  • Wage Withholding
  • IFTA and Motor Fuels
  • Special Events Sales Tax

If you are not able to file online, see Mailing Addresses for information on where to mail your forms.

For IRS mailing address and other contact information, see the IRS Web site.

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