(B) The credit is limited to seven-tenths of one percent multiplied by the lesser of:

1. (1) thirty thousand dollars; or
2. (2) the South Carolina qualified earned income of the spouse with the lower South Carolina qualified earned income for the taxable year.

(C)

1. (1) South Carolina qualified earned income is computed as follows:

   1. (a) South Carolina earned income of the spouse for the taxable year as defined in subsection (C)(2); less
   2. (b) the sum of the deductions described in Internal Revenue Code Section 62 (a) paragraphs (1) (Trade and Business Deductions), (2) (Certain Trade and Business Deductions of Employees), (6) (Pension, Profit-Sharing and Annuity Plans of Self-Employed Individuals), (7) (Retirement Savings), and (12)(Certain Required Repayments of Supplemental Unemployment Compensation Benefits) to the extent the deductions are properly allocable to or chargeable against South Carolina earned income.

2. (2) The term "South Carolina earned income" means income which is earned income within the meaning of Internal Revenue Code Section 911(d)(2) or 401(c)(2)(C) which is taxable in this State, except that:

   1. (a) it does not include an amount:

      1. (i) received from a retirement plan or an annuity;
      2. (ii) paid or distributed from an individual retirement plan as defined in Internal Revenue Code Section 7701(a)(37);
      3. (iii) received as deferred compensation; or
      4. (iv) received for services performed by an individual employed by his spouse within the meaning of Internal Revenue Code Section 3121(b)(3)(A) as amended through December 31, 1987; and
   2. (b) Internal Revenue Code Section 911(d)(2)(B) must be applied without regard to the phrase "not in excess of thirty percent of his share of net profits of such trade or business."