Installment | Due date |
1st | April 15 |
2nd | June 15 |
3rd | September 15 |
4th | January 15 of the following taxable year |
C.R.S. § 39-22-605
Section 9 of chapter 10 (SB 14-019), Session Laws of Colorado 2014, provides that changes to this section by the act apply to income tax years commencing on or after January 1, 2013, and any other income tax years that are open under § 39-21-107 or 39-21-108 .
For withholding tax, see § 39-22-604 .