W. Va. Code § 11-13F-5: Application of credit.

(a) Any unused portion of a credit allowed under this article may be taken as a credit against corporation net income taxes due for the taxable year, as provided in section eleven, article twenty-four of this chapter.

(b) If any portion of the amount certified as its revenue deficiency by the Public Service Commission is not recovered under subsection (a), it may be carried over to the subsequent year for business and occupation tax purposes and shall be applied as a credit before any other credits for that year are applied.

(c) In no event shall an eligible taxpayer be allowed to recover more than one hundred percent of its certified revenue deficiency.