DOR Taxation web site

Estimated Payments

Corporations are required to pay Colorado estimated income tax during the taxable year if it can be reasonably anticipated that the corporation's Colorado tax liability for the tax year will exceed $5,000. For more information, please see FYI Income 51.

Due Dates
Estimated tax payments are due in four equal installments on 


  • April 15 (first calendar quarter)
  • June 15 (second calendar quarter)
  • September 15 (third calendar quarter)
  • December 15 (fourth calendar quarter)

The payments will be due for fiscal year filers on the 15th day of the fourth, sixth, ninth and twelfth month of the tax year.If the due date falls on a Saturday, Sunday or state holiday, payment is due on the next business day.

Types of Returns
Estimated tax payments must be submitted in the same manner, whether separate, consolidated or combined, and using the same account number that the corporation expects to use when filing the Colorado corporation income tax return. See the 112EP booklet for information on how to handle the filing when the same account number is not used.

How to Compute the Estimated Tax
See the worksheet provided in the 112EP booklet.

Pay Online
You can make estimated tax payments through Revenue Online.

Pay By Mail
You can file estimated tax by using the 112EP booklet. Mail payments to
Colorado Department of Revenue

Denver, CO 80261