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Why Buy an A1 Certificate? A1 certificates are crucial documents that allow individuals to remain part of their home country's national insurance scheme while working abroad. This is especially important for companies with employees on secondments to other EU countries. The institution that issued the A1 certificates refused to take the certificates in criminal proceedings when the Belgian Social Security Inspectorate asked them to do so. What is the A1 Certificate? A1 certificates are legal documents that pr