In addition, each such member may irrevocably elect, within a period of one month following his date of participation, to contribute the amount which would have resulted had he, during each month of his credited service prior to his date of participation, made a contribution to the System equal to two percent of the portion of his rate of monthly salary or compensation in excess of four hundred dollars during the month immediately preceding his date of participation in the program and had such contributions been accumulated with interest at the rate of four percent per annum. If the member elects to make such additional voluntary contributions they shall be made within twelve months after his participation in the Supplemental Allowance Program commences, in such manner as the Board may deem reasonable.
The participating employer shall make an additional level annual contribution for a period of ten years subsequent to its participation date. Such additional contributions shall, in total, be sufficient to liquidate an amount equal to the total contributions by its participating members with respect to their service prior to the employer's participation date. For the purpose of calculating this additional contribution an interest rate of four percent per annum shall be used.
Any forfeitures shall be used to reduce the contributions otherwise payable by a particular participating employer, and will not be applied to increase the benefits of any participating member.
S.C. Code § 9-11-170