Consider any service provided by an employer to an employee for their use a wage exclusion
            if:
         
         
            - 
               
                  • 
                     such service is offered for sale to customers in the ordinary course of the employer's
                        line of business in which the employee is performing services, and
                      
 
 
- 
               
                  • 
                     the employer incurs no substantial additional cost (including loss of revenue) by
                        providing such service to the employee (regardless of any amount paid by the employee
                        for such service).