S.C. Code Ann. § 9-1-1170

The collection of employers' contributions shall be made as follows: (1) Upon the basis of each actuarial valuation provided herein the Board shall annually prepare and certify to each employer a statement of the total amount payable by the employer for the ensuing fiscal year to the employer annuity accumulation fund and this amount must be handled and disbursed in accordance with the usual appropriations; (2) The chief fiscal officer of each employer shall transmit funds which are due in the Retirement System office no later than the last day of the month on account of each employee who is a member of the System an amount sufficient to cover the normal contribution and the accrued liability contribution of each member employed by the employer for the preceding month. Delinquent payments under this section and Section 9-1-1160 must be charged interest compounded annually based on the adjusted prime rate charged by banks, rounded to the nearest full percent. The effective date of the adjustment must be based on the twelve-month period ending March thirty-first of any calendar year and must be established by April fifteenth for an effective date of the next July first. The adjusted prime rate charged by banks means the average predominant prime rate quoted by commercial banks to large businesses as determined by the Board of Governors of the Federal Reserve System. The adjusted prime rate used must be the adjusted prime rate charged by the bank during March of that year; and (3) If within ninety days after request by the Board any employer has not provided the System with the records and other information required under this item or if the full accrued amount of the contributions and interest provided for under this section due from members employed by an employer or from an employer other than the State has not been received by the System from the chief fiscal officer of the employer within thirty days after the last due date as provided in this item, then upon notification by the Board to the State Treasurer and Comptroller General as to the default of the employer as provided in this item, any distributions which might otherwise be made to the employer from any funds of the State must be withheld from the employer until notice from the Board to the State Treasurer that the employer is no longer in default.