Mo. Rev. Stat. § 249.110

The board of trustees shall have no power to levy or collect any taxes for the payment of any indebtedness incurred by said district unless and until the voters of the district shall have authorized the incurring of indebtedness at an election, but all such expenses and indebtedness incurred by said district may be paid out of funds which may be received by said district from the sale of bonds authorized by the voters at any such election.