TCTM02088 | Entitlement: Residence rules - Right to reside: Nationals of EEA member states
From HM Revenue & Customs · Tax Credits Technical Manual
Countries within the European Union (EU) prior to 1 May 2004 were:
UK
Denmark
Sweden
Ireland
France
Germany
Spain
Portugal
Netherlands
Austria
Belgium
Finland
Italy
Luxembourg
Greece
The EU has an agreement with Norway, Iceland and Liechtenstein (the European Economic Area, [EEA]) and a separate agreement with Switzerland, which confers similar rights of EU nationals on nationals of those countries.
On 1 May 2004, ten countries joined the EU. They were:
Estonia*
Latvia*
Lithuania*
Poland*
The Czech Republic*
Slovakia*
Hungary*
Slovenia*
Cyprus
Malta
(* Called the “A8” countries - see below)
On 1 January 2007, 2 countries joined the EU. They were:
Bulgaria
Romania
On 1 July 2013, Croatia joined the EU.