Mo. Const. art. VI, § 26(a). Limitation on indebtedness of local governments without popular vote

No county, city, incorporated town or village, school district or other political corporation or subdivision of the state shall become indebted in an amount exceeding in any year the income and revenue provided for such year plus any unencumbered balances from previous years, except as otherwise provided in this constitution. [Effective - 27 Feb 1945 , see footnote]