(1) For purposes of the income tax imposed by this chapter, a major medical or pharmaceutical supplier of a Mississippi distribution facility whose business activity is taxable both within and without this state shall apportion its business income (income which is includable in the apportionable tax base) to this state by multiplying such income by an apportionment percentage determined in accordance with this section.

(2) The apportionment percentage of a major medical or pharmaceutical supplier of a Mississippi distribution facility shall be determined by:

(a) Adding together:

(i) A payroll factor, which shall be counted twice,

(ii) A property factor, which shall be counted twice, and

(iii) A sales factor, which shall be counted once; and

(b) Then dividing the sum of such factors by five (5).

(3) The payroll factor, property factor, and sales factor of a major medical or pharmaceutical supplier of a Mississippi distribution facility shall be calculated as follows:

(a) The payroll factor is a fraction, the numerator of which is the total amount paid to employees for services performed in this state for the taxable year and the denominator of which is the total amount paid both within and without this state during the taxable year;

(b) The property factor is a fraction, the numerator of which is the value of real property and tangible personal property rented to the taxpayer that is located or used within this state during the taxable year (valued at eight (8) times the annual rental rate) and the average value of the taxpayer’s real and tangible personal property owned that is located or used within this state during the taxable year and the denominator of which is the value of real property and tangible personal property rented to the taxpayer (valued at eight (8) times the annual rental rate) and the average value of the taxpayer’s real and tangible personal property owned that is located or used within and without this state during the taxable year; and

(c) The sales factor is a fraction, the numerator of which is the receipts of the taxpayer in this state during the taxable year and the denominator of which is the receipts of the taxpayer within and without this state during the taxable year.

(4) For purposes of this section:

(a) “Major medical” or “pharmaceutical supplier” means a company or group of affiliated companies (as defined in Section 27-7-37) who ship medical or pharmaceutical products to a Mississippi distribution facility.

(b) “Mississippi distribution facility” means and has the same definition as such term has in Section 27-13-13(2)(d).