S.C. Code § 12-60-1740
If it is determined that any tax in excess of the amount due was paid to or collected by a county, municipality, or other political subdivision, the treasurer within thirty days of the final determination shall refund the taxes and penalties, if any, so paid. The refund must be paid in preference to other claims against the county, municipality, or other political subdivision together with interest determined in accordance with Section 12-54-25. The full faith and credit of the county, municipality, or other political subdivision, as the case may be, is pledged as security for the funds. A county treasurer may refund the tax from current tax collections of the county, municipality, or other political subdivision if the treasurer collected and distributed the incorrectly collected tax for the county, municipality, or other political subdivision. When the treasurer has no current taxes of the county, municipality, or other political subdivision or when the treasurer did not collect the tax, notice of the approved refund must be transmitted to the entity or entities that received or collected the tax, and that entity or entities shall provide for the refund from other sources. If a treasurer does not have available the necessary funds, he shall report the refund due to the governing body of the appropriate political subdivision, and the governing body shall provide for the payment.
S.C. Code § 12-60-1740