Group S
Legal entity: Group S (social insurance fund)
Registration
INASTI/RSVZ (NISSE), List of social security funds (approved funds) + fund codes, fund code 001. Register (checked 2026-11-02).
Where it appears
- Best social insurance fund for self-employed in Belgium (2026)
Rank 5 of 8 rated · 5.0/10 · Working in Belgium
Best for: English speakers in Brussels who want to join online.