Fla. Stat. § 130.12
All money collected to pay the interest, or for a sinking fund of said bonded debt, shall be paid over by the tax collector, or person receiving the same on account of taxes collected or property sold therefor, to the said trustees, or to the other officials or boards to whom may have been transferred by law the duties and obligations formerly devolving upon said trustees, and the said trustees, or the said other officials or boards to whom may have been transferred by law the duties and obligations formerly devolving upon said trustees, are required to pay out of the moneys so received the interest of said county bonds, and to invest the residue in the bonds aforesaid, or if the said bonds cannot be had at par or at such premium as to said trustees or to the said other officials or boards to whom may have been transferred by law the duties and obligations formerly devolving upon said trustees, may seem reasonable and just, then such residue may be invested in United States, state, county or municipal bonds bearing interest; or in the event such bonds cannot be acquired to advantage, such funds shall be deposited in the savings department of national banks or state banks of the state, or savings banks organized and existing under the laws of this state, at the prevailing rate of interest, to be held as an accumulating fund for the ultimate redemption of said county bonds.
Fla. Stat. § 130.12