Compliance Blog

Expert guidance on frontalier compliance for Luxembourg HR managers and fiduciaries.

Social SecurityJune 2026 · 4 min read

What is an A1 Certificate and When Do Luxembourg Frontaliers Need One?

An A1 certificate certifies which country’s social security legislation applies to a worker. For frontaliers in Luxembourg it becomes mandatory once the binding social-security line is crossed — and a valid A1 is what unlocks the 49% framework ceiling. This guide explains when you need one and how to obtain it.

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