The privileged position of the social insurance funds is highlighted by the accreditation they are granted by the Minister of Middle Classes.

To be accredited, a social insurance fund must be set up under the form of a non-profit making association by a representative employers' organisation. Article 95 of the Royal Decree d.d. 19.12.1967 gives a description of this kind of organisation.

Their statutes must provide for the execution of the tasks imposed to them within the statute of the self-employed workers.
At the time of accreditation, the social insurance fund must have at least 10,000 affiliates.