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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:

  • 2024 Standard mileage rate is .67 cents
  • 2024 medical or moving mileage rate is .21 cents
  • 2024 charity mileage rate is .14 cents
  • 2024 Depreciation mileage rate is .28 cents

Income Tax Return Due Dates:

  • Individuals – 4/15/24; may be extended until 10/15/24.
  • Partnerships and S Corporations – 15th day of the 3rd month after year end; may be extended 6 months (Calendar-year taxpayers due 3/15/24; may be extended until 9/16/24.)
  • C Corporations – 18th day of the 4th month after year end; may be extended 6 months. (Calendar-year taxpayers due 4/15/24; may be extended 10/15/24.) (If fiscal year end is other than Dec 31 please go here)
  • Trusts – 18th day of the 4th month; may be extended 5 months and 15 days. (Calendar-year taxpayers due 4/15/24; may be extended 9/30/24.)
  • 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.