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Why Buy an A1 Certificate? A1 certificates are vital documents that allow individuals to remain part of the national insurance scheme while working abroad. This is particularly crucial for companies that have employees on secondments to other EU countries. The institution that issued A1 certificates refused to withdraw the certificates during criminal proceedings when the Belgian Social Security Inspectorate requested for them to do so. What is an A1 Certificate? An A1 certificate is an official document that proves an self-employed or employed person i