Colo. Rev. Stat. § 23-71-407
The board of trustees of any district may negotiate or contract with any person, corporation, association, or company for a loan not to exceed the difference between the anticipated revenues for the current fiscal year for the general fund and the amount credited to date to said general fund in order to eliminate the necessity of issuing registered warrants upon said general fund. Such loan shall be liquidated within six months thereafter from moneys subsequently credited to said general fund. The total rate of interest, including fees to be paid on such loan, shall not exceed seventy-five percent of the discount rate set by the federal reserve board for the tenth federal reserve district establishing the rate of interest which federal reserve banks shall charge member banks when such member banks borrow money from a federal reserve bank.
C.R.S. § 23-71-407