How do I make installment payment arrangements?
If you want to start making payments on your account prior to receiving the bill, you can mail in your payment with the Individual Income Tax Payment Voucher (DR 0900). Make sure you put your Social Security number (primary Social Security number if it is a joint filing) on the bottom of your payment check and the tax year to which the payment applies.
Payment Plans and Extensions of Time to File
If you expect to owe money when you file your return you can avoid penalty and interest by sending your payment on or before April 15 using the Extension Payment Voucher (DR 158-I) for Colorado individual income tax. Then file the return by the October 15 filing deadline. If you owe additional tax, you may pay it at the time you file the return, but the amount will be subject to interest and penalty rates.