Reporting Postings to Belgium | WorkAdministrationSending workers to Belgium requires multiple notifications and registrations. This overview explains which obligations apply to which type of work.Sending workers to Belgium requires multiple notifications and registrations. This overview explains which obligations apply to which type of work.Get your quote instantlyWhich notifications are mandatory?When posting to Belgium you face several parallel obligations. The Limosa declaration is always required. Other registrations depend on the nature of the work and the assignment.

Limosa declaration to the NSSO — always required before work starts

A1 certificate from home country — must be carried on site

Checkin@Work — required on construction sites from €500,000

Withholding obligation check for the client (35% in case of social debts)

Designated contact person for longer postings

Per type of work — required registrations

Installation & electrotechnical: Limosa + A1 + Checkin@Work if on a construction site

Maintenance & service: Limosa + A1

Cleaning & meat sector: Limosa + A1 + sector-specific registrations

Transport & international drivers: exempt from Limosa (transit)

Joint and several liability of the clientThe Belgian client faces risk if their foreign partners fail to file:

35% withholding on all payments in case of subcontractor social debts

15% withholding in case of subcontractor tax debts

Joint liability for wages and NSSO contributions

Mandatory verification via "Check inhoudingsplicht 30bis/30ter" (NSSO portal and FPS Finance)

What you must provide per project

Worker list: Name, date of birth, nationality, INSZ number, A1 status

Project information: Belgian client, work location, start and end date

Contract value: Determines whether Checkin@Work is required (threshold €500,000)

Subcontractors: List of any subcontractors in the chain — for compliance check

How it works in the software

Step 1: Register the project on our platform — we determine which notifications are required

Step 2: Limosa declaration to the NSSO + Checkin@Work setup if applicable

Step 3: Verify A1 certificates and add them to the file

Step 4: Complete file per worker — instantly available during inspections

Working in Belgium

Limosa Declaration Belgium

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