Haw. Rev. Stat. § 237-7
"Service business or calling" includes all activities engaged in for other persons for a consideration which involve the rendering of a service, including professional and transportation services, as distinguished from the sale of tangible property or the production and sale of tangible property. "Service business or calling" does not include the services rendered by an employee to the employee's employer.
HRS § 237-7
Services rendered by retailers in promoting sales of commodities for which they received payment from the manufacturers and sellers of the commodities constituted non-professional activities within meaning of section.51 Haw. 281,458 P.2d 664. Taxpayer may be subject to both the service business and retailing classifications to extent each is applicable to particular items of gross income.53 Haw. 450,497 P.2d 37.