S.D. Codified Laws § 4-3-21
To protect the public credit and enable the state to provide for current expenses, the state treasurer, with the advice and consent of the Governor and auditor, is authorized and directed, whenever he finds it necessary to do so in order to provide for the actual necessary current expenses of conducting the public business of the state, to issue warrants based upon the revenues of the state already assessed for the current and preceding years but not yet collected, and in amount never exceeding the amount of such revenues so assessed and not yet collected, and for the purpose only of providing for the immediate and necessary current expenses of the state as aforesaid. Such warrants shall be sold at not less than par and at the lowest possible rate of interest, payable annually or semiannually.
SDCL 4-3-21