W. Va. Code § 11-13lL-5
(b) Applicable percentage.
(1) For the purposes of subsection (a) of this section, the applicable percentage for any property is determined under the following table:
If useful life is: The applicable percentage is:
Less than 4 years: zero percent
4 years or more: 100 percent
(2) The useful life of any property for purposes of this section may be determined at the election of the taxpayer under any one of the following methods:
(c) Placed in service or use. — For purposes of the credit allowed by this article, property is considered placed in service or use in the earlier of the following taxable years:
(2) The taxable year in which the property is placed in a condition or state of readiness and availability for a specifically assigned function.
Notwithstanding the foregoing, eligible certificate holder may begin claiming credits pursuant to this article upon certification.
(d) Cost. — For purposes of this section, the cost of property purchased for manufacturing investment, is determined under the following rules: