S.D. Codified Laws § 61-5A-5.1

Any political subdivisions of the state which are, or become, subject to this title on January 1, 1978, may elect to become liable for payments in lieu of contributions for a period of not less than two taxable years beginning with January 1, 1978, provided it files with the department a written notice of its election within the thirty-day period immediately following such date.