The income of a multi-state business subject to tax in South Carolina is ordinarily determined by allocating certain income to South Carolina and apportioning the remainder of the business's income based on the ratio of South Carolina sales to gross sales everywhere. However, the law permits a taxpayer or the South Carolina Department of Revenue to use an alternative method when the ordinary allocation and apportionment rules do not fairly represent the extent of a taxpayer's business activities in South Carolina.
On December 23, 2014 the South Carolina Supreme Court issued an ...