If the worker or employer desires Belgian coverage, they should send the letter to:
Office
National de Sécurité Sociale
Direction des Relations
Internationales
Place Victor Horta, 11
B-1060 Brussels
BELGIUM
Upon receipt of a request for a special exception, the agency that receives the request
will consider it in collaboration with the other country's agency. If both agencies
approve the request for a special exception, the agency that receives the request
will issue a certificate of coverage. The certificate of coverage will serve as proof
of exemption from coverage and taxes in the other country.