S.D. Codified Laws § 47-16-47
Creation of reserves--Credit to patrons
Reasonable reserves for necessary purposes may be created by a cooperative, which shall be credited to patrons in accordance with the ratio which their patronage bears to total patronage.
Source: SDC 1939, § 11.1131 (3) (a) as enacted by SL 1965, ch 23, § 1.