Colo. Rev. Stat. § 29-1-105
On or before a date to be determined by the governing body of each local government, all spending agencies shall prepare and submit to the person appointed to prepare the budget estimates of their expenditure requirements and their estimated revenues for the budget year, and, in connection therewith, the spending agency shall submit the corresponding actual figures for the last completed fiscal year and the estimated figures projected through the end of the current fiscal year and an explanatory schedule or statement classifying the expenditures by object and the revenues by source. In addition to the other information required by this section, every office, department, board, commission, and other spending agency of any local government shall prepare and submit to the person appointed to prepare the budget the information required by section 29-1-103 (3)(d). No later than October 15 of each year, the person appointed to prepare the budget shall submit such budget to the governing body.
C.R.S. § 29-1-105
This section is similar to former § 29-1-106 as it existed prior to 1990.