S.C. Code Ann. § 9-8-270
(C) For purposes of applying the limits under Internal Revenue Code Section 415(b), hereinafter referred to as "limit", the following shall apply:
(2) on and after January 1, 2009, with respect to a member who does not receive a portion of the member's annual benefit in a lump sum:
(4) on and after January 1, 1995, in no event shall a member's annual benefit payable under the system in any limitation year be greater than the limit applicable at the annuity starting date, as increased in subsequent years pursuant to Internal Revenue Code Section 415(d) and the regulations thereunder. If the form of benefit without regard to the automatic benefit increase feature is not a straight life or a qualified joint and survivor annuity, then the preceding sentence is applied by adjusting the form of benefit to an actuarially equivalent straight life annuity benefit that is determined using the following assumptions and that take into account the death benefits under the form of benefit:
(a) for a benefit paid in a form to which Internal Revenue Code Section 417(e)(3) does not apply, the actuarially equivalent straight life annuity benefit which is the greater of (or the reduced Internal Revenue Code Section 415(b) limit applicable at the annuity starting date which is the lesser of when adjusted in accordance with the following assumptions):
(b) for a benefit paid in a form to which Internal Revenue Code Section 417(e)(3) applies, the actuarially equivalent straight life annuity benefit which is the greatest of (or the reduced Internal Revenue Code Section 415(b) limit applicable at the annuity starting date which is the least of when adjusted in accordance with the following assumptions):
(D) Notwithstanding any other provision of law to the contrary, the system may modify a request by a member to make a contribution to the system if the amount of the contribution would exceed the limits provided in Internal Revenue Code Section 415 by using the following methods:
(3) effective for permissive service credit contributions made in years beginning after December 31, 1997, if a member makes one or more contributions to purchase permissive service credit under the system, then the requirements of this section will be treated as met only if:
(b) the requirements of Internal Revenue Code Section 415(c) are met, determined by treating all such contributions as annual additions for purposes of Internal Revenue Code Section 415(c).
For purposes of applying subitem (a) the system shall not fail to meet the reduced limit under Internal Revenue Code Section 415(b)(2)(C) solely by reason of this subsection (D), and for purposes of applying subitem (b) the system shall not fail to meet the percentage limitation under Internal Revenue Code Section 415(c)(1)(B) solely by reason of this subsection (D);
(4) for purposes of subsection (D), the term "permissive service credit" means service credit:
(c) which such member may receive only by making a voluntary additional contribution, in an amount determined under the system, which does not exceed the amount necessary to fund the benefit attributable to such service credit.
Effective for permissive service credit contributions made in years beginning after December 31, 1997, such term may include service credit for periods for which there is no performance of service, and, notwithstanding subitem (b), may include service credited in order to provide an increased benefit for service credit which a member is receiving under the system;
(5) the system shall fail to meet the requirements of this subsection (D) if:
(6) for purposes of item (5), effective for permissive service credit contributions made in years beginning after December 31, 1997, the term "nonqualified service credit" means permissive service credit other than that allowed with respect to:
(d) military service, other than qualified military service under Internal Revenue Code Section 414(u), recognized by such governmental plan.
In the case of service described in subitem (a), (b), or (c), such service shall be nonqualified service if recognition of such service would cause a member to receive a retirement benefit for the same service under more than one plan;
(7) in the case of a trustee-to-trustee transfer after December 31, 2001, to which Internal Revenue Code Section 403(b)(13)(A) or 457(e)(17)(A) applies, without regard to whether the transfer is made between plans maintained by the same employer: