If useful life is: The applicable percentage is:
4 years or more but less than 6 years. . . . . . . . . . 33 1/3%
6 years or more but less than 8 years. . . . . . . . . . 66 2/3%
8 years or more. . . . . . . . . . . . . . . . . . . . . . . 100%
The useful life of any property for purposes of this section shall be determined as of the date such property is first placed in service or use in this state by the taxpayer, and is the period during which the property may reasonably be expected to be useful to the taxpayer as part of a coal loading facility.
W. Va. Code § 11-13E-4