W. Va. Code § 11-13gG-5
(a) In general. — The aggregate annual credit allowance for the current taxable year is an amount equal to the sum of the following:
(c) Corporation net income taxes. —
(d) Personal income taxes. —
(e) If the wages, salaries, and other compensation fraction formula provisions of subsections (c) and (d) of this section, inclusive, do not fairly represent the taxes solely attributable to and the direct result of qualified investment of the taxpayer the Tax Commissioner may require, in respect to all or any part of the taxpayer’s businesses or activities, if reasonable:
(4) The employment of any other method to effectuate an equitable attribution of the taxes.
In order to effectuate the purposes of this subsection, the Tax Commissioner may propose for promulgation rules, including emergency rules, in accordance with §29A-3-1 et seq. of this code.