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Why Buy ? A1 certificates are essential documents which allow individuals to remain covered by their home country's national health insurance scheme when working abroad. This is especially important for businesses with employees who work in different EU countries. However, when the Belgian social security inspectorate demanded the institution that issued the A1 certificate to revoke them in criminal proceedings, it resisted. What is an A1 Certificate? An A1 certificate is a legal document that proves that an employee or self-employed person belongs to their home