77 Pa. Stat. § 1000.7
Insurers, including the State Workers' Insurance Fund, are authorized to provide, on a voluntary basis, to sole proprietors, partners of a partnership or members of a limited liability company, workers' compensation insurance equivalent to that which employers provide to employes which insure their liability under Article III. For the purposes of computing the premium charge, the wages of a sole proprietor, partner or member shall be at least equal to the minimum payroll for a corporate officer, and no more than the maximum payroll for a corporate officer, as established by underwriting rules approved by the Insurance Department. If an injury is compensable under the terms of this coverage, it shall be a rebuttable presumption that the wages of the injured individual are at least equal to minimum payroll for a corporate officer for the purposes of calculating his average weekly wage and paying benefits under sections 306 and 307.
77 P.S. § 1000.7