S.C. Code § 24-27-110
Unless another provision of law permits the filing of civil actions without the payment of court costs by indigent persons, if a prisoner brings a civil action, the prisoner is responsible for the full payment of the court costs. For this purpose, the court shall order the prisoner to pay a partial first-time payment of twenty percent of the preceding six months' income from the prisoner's trust account administered by the Department of Corrections and thereafter monthly payments of ten percent of the preceding month's income of this account. The department shall withdraw the monies maintained in the prisoner's trust account for payment of court costs and shall forward quarterly the monies collected to the appropriate court clerk or clerks until the court costs are paid in full.
S.C. Code § 24-27-110