S.C. Code Ann. § 12-6-5050: Tax preparer's taxpayer identification number.

A person who is an income tax preparer as defined in Internal Revenue Code Section 7701(a)(36) and who performs the same services with respect to South Carolina income tax returns or claims for refund shall include with his signature on the South Carolina return or claim for refund his taxpayer identification number as prescribed by Internal Revenue Code Section 6109 and applicable regulations.

Failure to comply with the provisions of this section results in a penalty as provided in Section 12-54-47.