S.D. Codified Laws § 61-6-36
The wage credits of an individual earned in employment with base period employers during the period commencing with the end of the base period and ending on the date on which the individual filed a valid claim are not available for benefit purposes in a subsequent benefit year unless, in addition thereto, the individual has earned wages in insured employment, since the establishment of the individual's previous benefit year, in an amount equivalent to at least four times the individual's current weekly benefit amount. A claim filed sufficiently in advance of anticipated unemployment to make the limitations of this section ineffective is invalid. It is the purpose of this section to prevent any individual from receiving benefits in more than one benefit year as the result of one separation from work.
SDCL 61-6-36