S.D. Codified Laws § 10-46A-1 : — TAXATIONREALTY IMPROVEMENT CONTRACTOR'S EXCISE TAX —46A-1 - Tax imposed on prime contractor's receipts from realty improvement contracts-Rate of tax TEXT PDF There is imposed an excise tax upon the gross receipts of all prime contractors engaged in realty improvement contracts, at the rate of two percent. SDCL 10-46A-1 SL 1979, ch 84, § 12A; SL 1980, ch 100, § 1; SL 1984, ch 92, §§ 1, 1A; SL 1985, ch 92.