Colo. Rev. Stat. § 39-3.5-108
As soon as practicable after January 1, the state treasurer shall send a deferral notice to any taxpayer who has claimed a deferral of property taxes in the previous calendar year. The deferral notice must be substantially in the following form:
To: (name of taxpayer)
If you want to defer the collection of ad valorem property taxes on your homestead for the assessment year ending on December 31, __, you must file a claim for deferral not later than April 1, __, with (state treasurer or the name of third-party administrator, if applicable). Forms for filing the claims are available at (website and mailing address for state treasurer or third-party administrator, if applicable).
If you fail to file your claim for deferral on or before April 1, __, your real property taxes will be due and payable in accordance with the schedule set out in the tax notice you separately received from your county treasurer.
If you change your permanent address at any time during the assessment year ending on December 31, __, you must notify the state treasurer promptly.
C.R.S. § 39-3.5-108