Colo. Rev. Stat. § 30-20-615
Failure to pay any installment, whether of principal or interest, when due shall cause the whole of the unpaid principal to become due and collectible immediately, and the whole amount of the unpaid principal and accrued interest shall thereafter draw interest at the rate established pursuant to section 5-12-106(2) and (3), C.R.S., until the day of sale; but, at any time prior to the day of sale, the owner may pay the amount of all unpaid installments, with interest at the penalty rate set by the assessing resolution, and all costs of collection accrued and shall thereupon be restored to the right thereafter to pay in installments in the same manner as if default had not been suffered. The owner of any property not in default as to any installment or payment may, at any time, pay the whole of the unpaid principal with the interest accruing to the maturity of the next installment of interest or principal; except that any owner who pays the whole of the unpaid balance pursuant to this section may be assessed a prepayment premium not to exceed three percent of the unpaid principal, the amount of which premium shall be specified in the resolution imposing the assessment.
C.R.S. § 30-20-615
This section was originally numbered as § 30-20-614 in C.R.S. 1973 but was renumbered on revision in the 1977 replacement volume for ease of location.