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Where to Buy an A1 Certificate The certificate A1 defines the social security system applicable to an individual who is seconded abroad to work. This is a crucial document, and failure to adhere can result in serious consequences. A Belgian inspectorate initiated criminal actions against a Slovak company for deploying workers without the A1 certifications required. A1 certificates are binding on the institutions and courts of the latter Member States. What is an A1 Certificate? The A1 certifica