Colo. Rev. Stat. § 24-51-1728
In computing the amount of any deferred retirement allowance becoming due to such member upon final termination of employment, such member must, at the time of the effective date of termination of service, have a credit of accumulated contributions in such amount as would have been to such member's credit if such member had complied in full with the requirements of sections 24-51-1705 and 24-51-1707 as such requirements may apply. In the event said member fails to comply with such requirements, as applicable, then the accredited service of such member, subsequent to December 1, 1945, shall be credited in the same ratio that accumulated contributions, at the time of termination of service, bear to such member's credit if such member had complied in full with the requirements of sections 24-51-1705 and 24-51-1707 as such requirements may apply. If the provisions of section 24-51-1706 apply to such member applying for a deferred retirement allowance, then no portion of service subject to said provisions shall be counted as accredited service unless, at the time of termination of service, said member completed payment of the total amounts required by said section 24-51-1706. If such total amount as required by section 24-51-1706 is not so paid within such time, any incomplete amount paid in pursuant to section 24-51-1706 shall be refunded, without increase of any kind to such member, under such rules and regulations as the association may provide.
C.R.S. § 24-51-1728