An agreement was reached between the UK Government and European Commission to align Northern Ireland on rules for goods with the European Single Market, to maintain an open border on the island of Ireland. The United Kingdom left the European Single Market on 31 December 2020. Turkey has access to the free movement of some goods via its membership in the European Union–Turkey Customs Union. In addition, through three individual agreements on a Deep and Comprehensive Free Trade Area (DCFTA) with the EU, the post-Soviet countries of Georgia, Moldova, and Ukraine have also been granted limited access to the Single Market in selected sectors.

Ī number of potential EU accession candidates have Stabilisation and Association Agreements with the EU, which allow for limited participation in selected sectors of the Single Market, including Albania, Bosnia and Herzegovina, Kosovo, Montenegro, North Macedonia, and Serbia. The single market seeks to guarantee the free movement of goods, capital, services, and people, known collectively as the 'four freedoms'. The European Single Market, Internal Market or Common Market is a single market comprising the 27 member states of the European Union (EU) as well as – with certain exceptions – Iceland, Liechtenstein, and Norway through the Agreement on the European Economic Area, and Switzerland through bilateral treaties.

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