Louisiana Revised Statutes Tit. 33, § 2921. Expenditures not to exceed estimated revenue

No police jury nor any municipal corporation shall, in any one year, make any appropriation of, approve any claim against, or make any expenditure from the annual revenue for that year, if the appropriation, approved claim, or expenditure, separately or together with other appropriations, approved claims, or expenditures, is in excess of the estimated revenue of that year.