Belgian client: check Limosa L-1 form

The final user or Belgian ordering party checks the declaration before any direct or subcontracted work. It requests the L-1 receipt from the service provider or worker involved.

If the document cannot be presented, the client or their representative submits the "L-1 form absent" declaration via Limosa. Keep the receipt: this legal notice relieves the client of responsibility for this declaration obligation. Reference: ONSS instructions 2026/3.