Not tax advice. This site gives general information and rough estimates only. It is not tax, legal or accounting advice and does not create a preparer relationship. Rules and your situation vary. Check the linked official sources or ask a licensed tax professional before you pay or file.
Colorado estimated tax due dates (2026 tax year)
| Payment | Due |
|---|---|
| 1 | Apr 15, 2026 |
| 2 | Jun 15, 2026 |
| 3 | Sep 15, 2026 |
| 4 | Jan 15, 2027 |
Form/payment: Form DR 0104EP
Weekend/legal holiday moves to next business day.
Source: Colorado tax agency page · last verified 2026-10-17 · Source: form or instructions · last verified 2026-10-17
Federal dates are separate: Apr 15, Jun 15, Sep 15, 2026 and Jan 15, 2027 (federal page). Weekend or holiday dates generally move to the next business day.