There is imposed an excise tax upon the gross receipts of all prime contractors and subcontractors engaged in realty improvement contracts for those persons subject to tax under chapter 10-28, 10-33, 10-34, 10-35, 10-36, or 10-36A or any municipal telephone company subject to chapter 9-41 or any rural water system, at the rate of two percent.
SDCL 10-46B-1