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.