Colorado Extension Form - If you cannot file your colorado income tax return by the deadline, you. Web monday, april 15, 2024. Pay all or some of your colorado income taxes online via: 15 to file a return. File your state income taxes online. If you owe co income.
Web monday, april 15, 2024. Pay all or some of your colorado income taxes online via: If you owe co income. File your state income taxes online. 15 to file a return. If you cannot file your colorado income tax return by the deadline, you.