Treaty of Accession 2003

The Treaty of Accession 2003 was the agreement between the member states of the European Union and ten countries (Czech Republic, Estonia, Cyprus, Latvia, Lithuania, Hungary, Malta, Poland, Slovenia, Slovakia), concerning these countries' accession into the EU (see 2004 enlargement of the European Union). At the same time it changed a number of points which were originally laid down in the Treaty of Nice. The treaty was signed on 16 April 2003 in Athens, Greece and it entered into force on 1 May 2004, resulting in enlargement of the European Union with 10 states.

Background
The European Union comprises a large number of overlapping legal structures which is a result of it being defined by successive international treaties.

As well as other acts which together form the current legal framework (acquis) of the EU, the Treaty of Accession 2003 modifies:
 * the Treaty of Rome (establishing the European Economic Community),
 * the Euratom Treaty (establishing the European Atomic Energy Community)
 * the Maastricht Treaty (establishing the European Union)

All changes to the above treaties are made by article 11-19 in part two of the accession treaty. Beside of revising voting weights and the number of member state representatives at all European institutions, the most notable change outlined how Qualified Majority Voting shall be handled in the Council of the European Union. As from 1 November 2004, whenever the Council vote to adopt a decision by Qualified Majority, this need support both from a majority of member states which at the same time represents minimum 232 out of 321 weighted votes (72,3%), while also as a third requirement those states must represent at least 62% of the total population of the Union. Otherwise the decision in question shall not be adopted.

The Treaty's full name in English is:


 * Treaty between the Kingdom of Belgium, the Kingdom of Denmark, the Federal Republic of Germany, the Hellenic Republic, the Kingdom of Spain, the French Republic, Ireland, the Italian Republic, the Grand Duchy of Luxembourg, the Kingdom of the Netherlands, the Republic of Austria, the Portuguese Republic, the Republic of Finland, the Kingdom of Sweden, the United Kingdom of Great Britain and Northern Ireland (Member States of the European Union) and the Czech Republic, the Republic of Estonia, the Republic of Cyprus, the Republic of Latvia, the Republic of Lithuania, the Republic of Hungary, the Republic of Malta, the Republic of Poland, the Republic of Slovenia, the Slovak Republic, concerning the accession of the Czech Republic, the Republic of Estonia, the Republic of Cyprus, the Republic of Latvia, the Republic of Lithuania, the Republic of Hungary, the Republic of Malta, the Republic of Poland, the Republic of Slovenia and the Slovak Republic to the European Union.