Coloradans who still need to file state income tax returns by April 15 get automatic extension to file but still must pay by the deadline, Taxation Division says
Denver, Monday, April 13, 2026 — With the April 15 deadline only a few days away, some taxpayers are rushing to file their Colorado income tax returns on time.
But the Colorado Division of Taxation wants to remind Coloradans that there is no need to rush. Taxpayers who miss the deadline will receive an automatic, six-month extension to Oct. 15 to file their Colorado return.