The fact that salespeople perform substantial work in servicing the product(s) they
sell does not necessarily preclude meeting the requirements of the Social Security
Act Section 210 (j) (3) or correspondingly, the Internal Revenue Code Section 3121 (d) (3) (D). For example, a salesperson who spends a day selling a machine and a day supervising
its installation, and perhaps training the purchaser's personnel in its use, may still
have performed these services as a full-time salesperson. The furnishing of these
services by the salesperson may be a necessary part of the incentive for the buyer
to purchase the product. Therefore, the question is whether the total activity is
essentially a selling activity. If it is, the services related to such sales, even
though substantial, are an integral part of the sale. If it is not, the worker does
not meet the requirements for a statutory employee.