If useful life or applicable The applicable
lease term is: percentage is:
3 yrs. or more but less than 6 yrs.33-1/3%
6 yrs. or more but less than 8 yrs.66-2/3%
8 yrs. or more 100%
The useful life of any property for purposes of this section shall be the actual economic useful life determined as of the date such property is first placed in service or use in this state by the taxpayer, determined for financial accounting purposes in accordance with generally accepted principles of accounting.
Such cost of leased tangible personal property shall then be multiplied by the applicable percentage determined under subsection (b) of this section based upon the shorter of the first ten years of the primary lease term or the primary lease term in order to determine qualified investment in such leased property.
W. Va. Code § 11-13D-5b