The Department of Revenue is processing 2023 income tax returns. For more information, please read the Department's announcement.


Procedure & Administration Rules Adopted

Hide Featured Image

The Colorado Department of Revenue, Division of Taxation, has adopted the Procedure & Administration Rules based on the hearing held on Wednesday, November 4, 2020.

Additionally, the Department solicited public comment on the rules on Wednesday, July 1, 2020.

Copies of the adopted rules, may be found on the Secretary of State’swebsite at the links below.  The rules will take effect 20 days after publication in the Colorado Register.  The date of publication, and the effective date, is also available on the Secretary of State’s website.


Rule 39-21-103-1. Request for Hearing.

Rule 39-21-103-2. Assessments.

Rule 39-21-104. Rejection of Claims.

Rule 39-21-105. Notice of Appeals.

Rule 39-21-105.5. Notices – First Class Mail

Rule 39-21-107. Limitations on Assessments.

Rule 39-21-108. Claiming a Refund.

Rule 39-21-109. Interest on Amount Due.

Rule 39-21-109(1.5). Interest Discount.

Rule 39-21-113. Reports and Returns.

Rule 39-21-116.5. Penalties for Officers and Members.