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Where to Buy an A1 Certificate The certificate A1 is a reference to the social security system that applies to a person who is seconded abroad to work. It's an important document, and non-compliance can have consequences. A Belgian inspection started criminal proceedings against an Slovak firm that had posted workers without A1 certificates. A1 certificates are binding on the institutions and courts of the latter Member States. What is an A1 Certificate? The A1 certificate is a vital document for busin