A1 form

The Portable Document A1 (PD A1) certifies the social security legislation which applies to a posted worker and confirms that this person has no obligations to pay contributions in another Member State. It is used in situations where an employed or self-employed person has a connection through their employment or self-employment with more than one EU country. A person is only subject to the legislation of one country at any one time. The A1 is issued by the country to whose legislation they are subject and confirms that they are not subject to the legislation of any other country they are connected with.