S.D. Codified Laws § 58-16-26
The premium for a policy issued under § 58-16-23 shall be paid by the policyholder, either from the creditor's funds, or from charges collected from the insured debtors, or from both. A policy on which part or all of the premium is to be derived from the collection from the insured debtors of identifiable charges not required of uninsured debtors shall not include, in the class or classes of debtors eligible for insurance, debtors under obligations outstanding at its date of issue without evidence of individual insurability unless at least seventy-five percent of the then eligible debtors elect to pay the required charges. A policy on which no part of the premium is to be derived from the collection of such identifiable charges must insure all eligible debtors, or all except any as to whom evidence of individual insurability is not satisfactory to the insurer.
SDCL 58-16-26