S.D. Codified Laws § 9-21-26.1
The governing body may by a two-thirds vote transfer the surplus money in any of the several funds to any other fund or funds or may appropriate such surplus money to the payment of any outstanding indebtedness of the municipality. No money in any fund may be transferred unless a sufficient amount is left to pay all outstanding warrants drawn against the fund, together with any other indebtedness or contemplated expenditures from the fund for the current fiscal year. No money may be transferred from any sinking or interest fund unless sufficient money is left to pay all interest which may accrue on and the principal of all outstanding bonds. If there remains in the treasury of any municipality an unexpended balance of any special fund, and all claims against such fund have been fully paid, and the purpose for which it was created has been fully served, and there remains no further use for such balance for the purpose for which it was created, the governing board of the municipality may transfer such balance to any other fund of the municipality or subdivision to which such balance belongs. Enterprise funds are not construed to be special funds for purposes of this section.
SDCL 9-21-26.1