S.C. Code § 59-40-145
A child who resides in a school district other than the one where a charter school is located may attend a charter school outside his district of residence; however, the receiving charter school shall have authority to grant or deny permission for the student to attend pursuant to Sections 59-40-40(2)(b) and 59-40-50(B)(7) and (8) according to the terms of the charter after in-district children have been given priority in enrollment. However, the out-of-district enrollment shall not exceed twenty percent of the total enrollment of the charter school without the approval of the sponsoring district board of trustees. The district sending children to the charter school under the terms of this section must be notified immediately of the transferring students. Out-of-district students must be considered based on the order in which their applications are received. If the twenty percent out-of-district enrollment is from one school district, then the sending district must concur with any additional students transferring from that district to attend the charter school. The charter school to which the child is transferring shall be eligible for state and federal funding according to the formula defined in Section 59-40-140(A), (B), and (C), as applicable. However, this section does not apply to a charter school sponsored by the South Carolina Public Charter School District Board of Trustees.
S.C. Code § 59-40-145