COLORADO Tax Forms and Instructions
Below are the relevant links for CO State Tax information.
Colorado State Mandate Tax preparers who have been approved by the IRS are automatically approved to submit Colorado returns electronically. There is no separate approval process for Colorado.



COLORADO Tax Forms and Instructions Information
Online Credit Card Payments
  • Offical Payments
    Or call 1-800-2PAY-TAX (Offical payments charges a nominal fee for this service)(Use Jurisdiction Code 2000 for Individual and Jurisdiction Code 2006 for Business Taxes)
Mailing Addresses
  • Return Mailing Address:
    Colorado Department of Revenue
    1375 Sherman St.
    Denver, CO 80261-0005

  • Return Mailing Address without Refund:
    Colorado Department of Revenue
    1375 Sherman St.
    Denver, CO 80261-0005

  • Estimates Mailing Address:
    Colorado Department of Revenue
    1375 Sherman St.
    Denver, CO 80261-0008

  • Amended Return Mailing Address:
    Colorado Department of Revenue
    1375 Sherman St.
    Denver, CO 80261-0005

  • Extension Mailing Address:
    If you cant file your Colorado tax return by April 15, 2009, you may file your Colorado return on or before October 15, 2009 without filing a written request for extension

    Colorado Department of Revenue
    1375 Sherman St.
    Denver, CO 80261-0008

  • Electronic Filing:
    Colorado accepts Resident, Nonresident, and Part-year returns electronically. They can be transmitted with the Federal return or transmitted as a State only return. However, to avoid late payment penalties, you must pay at least 90% of your tax liability by April 15 and the balance when you file by October 15.
Federal Tax Information