Client Login Center

If you have already established your username and password, you may enter your information in the login dialog box above.

To create an account click here or to see our terms of use click here.

Enterprise Zone Certification:

As of 1/1/2012, businesses must now be pre-certified to qualify for tax credits. Learn more: Enterprise Zone Major Legislative Changes,  Enterprise Zone Program Fact Sheet and Upstate Colorado letter

 Standard mileage rates:

  • 2018 standard mileage rate is 54.5 cents
  • 2018 medical or moving mileage rate is 18 cents
  • 2018 charity mileage rate is 14 cents
  • 2018 Depreciation mileage rate is 25 cents
  • 2017 standard mileage rate is 53.5 cents
  • 2017 medical or moving mileage rate is 17 cents
  • 2017 charity mileage rate is 14 cents
  • 2017 Depreciation mileage rate is 25 cents

Income Tax Return Due Dates:

  • Individuals – 4/17/18; may be extended until 10/15/18.
  • Partnerships and S Corporations – 15th day of the 3rd month after year end; may be extended 6 months (Calendar-year taxpayers due 3/15/18; may be extended until 9/17/18.)
  • C Corporations – 15th day of the 4th month after year end; may be extended 6 months. (Calendar-year taxpayers due 4/17/18; may be extended 10/15/18.) (If fiscal year end is other than Dec 31 please go here)
  • Trusts – 15th day of the 4th month; may be extended 5 months and 15 days. (Calendar-year taxpayers due 4/17/18; may be extended 10/1/18.)
  • Tax-Exempt Organizations – 15th day of the 5th month after year end; may be extended 6 months.

Colorado returns for all entities – 15th day of the 4th month following year end, automatic 6-month extension if federal extension is filed.