S.C. Code § 9-12-50
On and after the effective date of the QEBA, the board shall pay to each eligible retiree and beneficiary a supplemental retirement allowance equal to the difference between the retiree's or beneficiary's monthly benefit otherwise payable from the applicable retirement system prior to any reduction or limitation because of Section 415 of the Internal Revenue Code and the actual monthly benefit payable from the retirement system as limited by Section 415. The board shall compute and pay the supplemental retirement allowance in the same form, at the same time, and to the same persons as such benefits would have otherwise been paid as a monthly pension under the retirement system except for the Internal Revenue Code Section 415 limitations.
S.C. Code § 9-12-50