S.D. Codified Laws § 9-43-118
The moneys collected in and held by the debt service fund for the general obligation bonds shall be applied toward the payment of the general obligation bonds and interest, and the governing body may annually cause to be certified to the county auditor the amount applied. The governing body may direct that the tax levy collectible in the following year for the payment of the bonds be reduced by an amount not exceeding the sum certified. However, the municipality remains obligated to levy general taxes sufficient, together with other resources of the debt service fund, for the prompt payment of all principal and interest due on the general obligation bonds. No assessment bond transferred to any debt service fund pursuant to the provisions of § 9-43-116 may subsequently be transferred to any other fund until the general obligation bonds for which the fund is maintained have been fully paid with interest.
SDCL 9-43-118