S.D. Codified Laws § 4-5-30
The state investment officer, utilizing the facilities of the state budgetary accounting system, shall pool cash accounts within the funds enumerated in § 4-5-23. The Appropriations Committee of the Legislature, upon recommendations from the commissioner of finance and management, shall certify those funds which are to participate in the interest income of the pooled investments. The state investment officer shall credit the gain or interest due as a result of investments made pursuant to § 4-5-29 on a pro rata basis to the participating funds in the same ratio as the average daily cash balance of each fund bears to the total average cash balance of all funds.
If requested by the state investment officer during each fiscal year, the state treasurer shall transfer money from the South Dakota retirement fund, health care trust fund, education enhancement trust fund, the trust fund derived from the sale of state cement enterprises, the general fund portion of the pooled income account for the permanent school and other educational fund provided for in S.D. Const., Art. VIII, and any other specific fund approved by the Bureau of Finance and Management, other than the state pooled fund, to the investment council expense account in an amount not to exceed the ratio of the average assets in each fund for the previous fiscal year to the total average assets managed by the investment council, other than the state pooled fund, for the previous fiscal year multiplied by the difference between the budget of the investment council for each fiscal year and the total of the current fiscal year beginning cash balance in the investment council expense account plus two hundredths of a percent of the prior fiscal year's average assets in the state pooled fund. If requested by the state investment officer during each fiscal year, the state treasurer shall transfer money from the pooled income account to the investment council expense account in an amount not to exceed two hundredths of a percent of the prior fiscal year's average assets in the state pooled fund. The state investment officer may make multiple transfer requests during the fiscal year, with each request being proportionate among the funds, provided that the total transfers do not exceed the amounts provided by this section.
SDCL 4-5-30