Estimated tax payments are due in four equal installments on the following dates. For additional information, see FYI Income 51.
- April 15 (first calendar quarter)
- June 15 (second calendar quarter)
- September 15 (third calendar quarter)
- January 15 (fourth calendar quarter)
If the due date falls on a Saturday, Sunday or state holiday, payment is due on the next business day.
Estimated Payment Information
Credit/Debit Card or E-Check
Credit/debit card or e-check through Revenue Online. You do not need to be logged in to your Revenue Online account to make the payment. Visit the Credit/Debit Card or E-Check web page for more information.
Electronic Funds Transfer (EFT)
Check or Money Order
Make the check or money order payable to the Colorado Department of Revenue.
- A check should never be sent to the Department of Revenue without a voucher form.
- Do not send a copy of the return.
- Write your Social Security number, the tax year and the words 'Form 104EP' on the check.
- Do not staple the check to your paper return.
Send the payment to:
Colorado Department of Revenue
Denver, CO 80261-0008