(A) Except as provided in § 12-6-1210(F), an "S" Corporation having a valid federal election under the Internal Revenue Code Subchapter "S" is not subject to tax under this chapter to the extent it would be exempt from federal corporate income tax. Each shareholder shall include its share of South Carolina "S" Corporation income on the shareholder’s income tax return. All of the provisions of the Internal Revenue Code apply to determine the gross income, adjusted gross income, and taxable income of an "S" Corporation and its shareholders subject to the modifications provided in Article 9 of this chapter and subject to allocation and apportionment as provided in Article 17 of this chapter.

(B) A taxpayer who is a shareholder in a bank, as defined in Section 581 of the IRC, having a valid federal election under Subchapter S, is allowed a tax credit that equals the difference between: (i) the taxpayer’s tax as computed pursuant to this chapter, including all credits other than the credit allowed pursuant to this section; and (ii) the tax as computed pursuant to this chapter, including all credits other than the credit allowed pursuant to this section, but excluding the taxpayer’s prorata share of the net items of income and expense of the bank. The credit may not exceed the taxpayer’s prorata share of the tax imposed on the bank pursuant to § 12-11-30. These taxpayers are taxed pursuant to the provisions of this section and § 12-6-545, notwithstanding the exception contained in § 12-6-545(A)(1).