S.D. Codified Laws § 25-7A-4
Upon demand by the Department of Social Services, any parent in the state, whose absence from the home is the basis upon which the department is paying public assistance on behalf of a dependent child, shall complete a statement, under oath, of the noncustodial parent's current monthly income, the noncustodial parent's total income over the past thirty-six months, the number of dependents the noncustodial parent is supporting, the amount the noncustodial parent is contributing regularly toward the support of all children for whom application for assistance is made, the noncustodial parent's current monthly living expenses, and all other pertinent information to determine the noncustodial parent's ability to support the noncustodial parent's children. This section also applies to a parent who owes support to a custodian who has applied for support enforcement services, and to both the noncustodial parent and the custodian in a petition for modification filed pursuant to § 25-7A-22.
SDCL 25-7A-4