Nonbusiness income. - The term "nonbusiness income" means all income other than business income.
The term "base of operations" is the place of a more or less permanent nature from which the employee starts his or her work and to which he or she customarily returns in order to receive instructions from the taxpayer or communications from his or her customers, or other persons, or to replenish stock or other materials, repair equipment, or perform any other functions necessary to the exercise of his or her trade or profession at some other point or points. The term "place from which the service is directed or controlled" refers to the place from which the power to direct or control is exercised by the employer.
W. Va. Code § 11-21-37a