UPDATE..............
IRS Rev. Rul. 67-119
(This is only a short portion of the above IRS rulling.
Advice has been requested whether, for Federal employment tax purposes, officials of athletic contests, for example, referees and umpires, are employees of an association through which their services are offered to various schools, including the members of a statewide high school athletic league. The association is a nonprofit, self-governing organization. Its purpose is to train and develop contest officials and to maintain a booking office for high schools, preparatory schools, and others desiring the services of the officials. Its membership consists entirely of officials who pay annual membership dues to, and participate in the operation of, the association. The association receives an annual booking fee from each school using its services.
Note:
The only state association that follows the above ruling about booking fee is North Carolina, $100 per varsity school, $75 per JV school, via contract or agreement. No portion of contest fee is paid by the official to the booking agent (assignor, assignment secretary, etc).
RETIRED-UMP