According to a press release of 1 November 2021, published by the Swiss Federal Social Insurance Office, the Switzerland - United Kingdom Social Security Coordination Agreement (2021) applies provisionally from 1 November 2021. The agreement will enter into force after all necessary domestic ratification procedures for the entry into force have been met in both contracting states. For more information on the provisional application, see article 73 of the Switzerland - United Kingdom Social Security Coordination Agreement (2021).
The new agreement coordinates the social security systems of the two states as the European Union - Switzerland Free Movement of Persons Agreement (1999) is no longer applicable in relations between Switzerland and the United Kingdom following Brexit.