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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 working abroad for a secondment. It's an important document and the non-compliance with it can result in consequences. A Belgian inspection launched criminal proceedings against an Slovak firm that had posted workers without A1 certificates. A1 certificates have binding effects on the courts and institutions of the latter Member States. What is an A1 Cer