SDCL § 9-21-22: Maximum obligations under appropriation.

No obligation under any appropriation shall be incurred or warrant drawn in excess of seventy-five percent of the tax levy made for the fund provided for such appropriation for the current fiscal year and seventy-five percent of the cash in the treasury in such fund derived from sources other than such tax levy prior to the second Monday in May of each fiscal year, except under appropriation made exclusively for the purchase of land or buildings or the erection of buildings for the municipality.