S.C. Code Ann. § 12-6-3381

There is allowed as a credit against the tax imposed pursuant to Section 12-6-510 an amount equal to fifty dollars for taxpayers who married during the taxable year and completed the requirements of Section 20-1-230. The credit must be claimed by means of a form prescribed by the South Carolina Department of Revenue containing that information required by the department for the accurate and efficient administration of this credit. Regardless of federal filing statutes, each spouse may only receive one non-refundable income tax credit of twenty-five dollars, for a maximum tax credit of fifty dollars per couple under this section.