S.C. Code Ann. § 24-27-100: Filing fees.

Unless another provision of law permits the filing of civil actions without the payment of filing fees by indigent persons, if a prisoner brings a civil action or proceeding, the court, upon the filing of the action, shall order the prisoner to pay as a partial payment of any filing fees required by law a 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 for this account. The department shall withdraw the monies maintained in the prisoner's trust account for payment of filing fees and shall forward quarterly the monies collected to the appropriate court clerk or clerks until the filing fees are paid in full.

The prisoner must file a certified copy of his trust account with the court that reflects the prisoner's balance at the time the complaint is filed unless the prisoner does not have a trust account.