S.C. Code Ann. § 12-6-2820 — Date deferred payments are due and payable; payment of taxes at accelerated rate; effect of taxpayer's failure to pay interest

(A) All deferred tax payments attributable to a particular taxable year are due and payable no later than the annual return filing date for the fifth taxable year following the taxable year for which the payment of the tax was first deferred. A taxpayer may pay deferred taxes at an accelerated rate. Failure to pay deferred taxes as required renders the taxpayer ineligible to defer payment of taxes for a subsequent tax year.
(B) If the taxpayer fails to pay the interest as required in Section 12-6-2810, all taxes deferred pursuant to this article are due and payable on the due date of the unpaid interest and may be collected as taxes are collected. No interest is due on amounts deferred for less than an entire taxable year.