In order to effectuate the purposes of this subsection, the commissioner shall propose for promulgation legislative rules in accordance with article three, chapter twenty-nine-a of this code: Provided, That the initial promulgation may be by emergency rule. The rule shall set forth the standards by which this subsection will be implemented and enforced: Provided, however, That with regard to investment placed in service prior to the passage of this provision, taxpayers having a specific written determination from the tax commissioner that the taxpayer is authorized or required to take credit against tax not attributable to qualified investment shall not be subject to the alternative allocation of credit provided for under this subsection.
On and after the first day of July, one thousand nine hundred eighty-seven, for purchases of tangible personal property and taxable services made on or after that date, that portion of the allowable credit, which is attributable to qualified investment in a business or activity subject to the taxes imposed by articles fifteen and fifteen-a of this chapter on purchases for use or consumption in the conduct of such business or activity, shall be applied to reduce up to eighty percent of the taxes imposed by said articles on purchases that are directly used or consumed in the qualified investment activity. When property and services purchased for use or consumption are not solely used or consumed in the qualified investment activity, the cost thereof shall be apportioned between such activities. Only that amount apportioned to purchases directly used or consumed in the qualified investment activity shall be included when applying the credit allowable under this subsection. On and after the first day of July, one thousand nine hundred ninety-three, for purchases of tangible personal property and taxable services made on or after that date for use or consumption in the conduct of business, no portion of the allowable credit may be applied against the taxes imposed by said articles.
W. Va. Code § 11-13C-5