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Where to Buy an A1 Certificate The certificate A1 determines the social security system that is applicable to a person seconded to work in a different Member State. It's a crucial document and non-compliance can have consequences. A Belgian inspectorate initiated criminal proceedings against a Slovak company for posting workers who did not have A1 certificates required for posting. A1 certificates have a binding effect on the courts and institutions of the other Member States. What is an A1 Certificate? The A1 certificate is a crucial document for busin