There is no general ‘safe’ number of days

A common misconception is that short stays are automatically exempt from formalities. Belgian law does not work with one general threshold: each obligation (immigration, social security notification, employment law, tax) has its own rules and its own exemptions. A traveler can be exempt from one obligation and still caught by another.

The ‘business meetings’ exemption

The best-known safe harbour covers meetings in a closed circle: strategy discussions, contract negotiations, evaluation meetings, board meetings. For these activities, no work authorisation and no Limosa declaration are required, provided that:

• the attendance does not exceed 60 days per calendar year in Belgium, and
• no single meeting lasts longer than 20 consecutive calendar days.

The scope of the exemption is narrow: it covers meetings, not work. As soon as the traveler performs productive activities such as installing, training, auditing, supervising, delivering services to a client … the exemption no longer applies.

When the traveler actually works

If the activity qualifies as work, the usual posting framework applies, even for a few days:

• Limosa declaration before the activity starts (unless a specific exemption applies, e.g. for certain assembly or urgent repair situations);
• Work authorisation for non-EEA/Swiss nationals, unless an exemption applies;
• A1 certificate to document which social security system applies;
• Belgian mandatory employment conditions (including remuneration rules) for the duration of the posting.

The real risk: frequent, unmanaged travel

Enforcement rarely targets the one-off visitor. The exposure sits in patterns: the same employees traveling to Belgium month after month, without anyone tracking days or activities. Belgian social inspection services can request proof of the Limosa declaration on site, and the Belgian client or principal has its own verification duty, meaning your customer may ask for compliance documents you do not have.

Practical takeaways

• Map your travel: who goes to Belgium, how often, and to do what?
• Classify activities honestly: ‘meeting’ versus ‘productive work’ is the key distinction.
• Track the 60-day and 20-day limits per traveler.
• Build a simple pre-travel check into your workflow: activity, duration, nationality, documents.

How B-Mobility can help

B-Mobility, the international mobility solution of PKF BOFIDI, supports foreign employers with every legal, social security and immigration aspect of working in Belgium. Get in touch with our international mobility specialists.