Treaties of the European Union

Treaties of the European Union
Eurlex · Public domain · source
Name	Treaties of the European Union
Caption	Flag used by European Union
Date signed	Various
Location signed	Paris, Rome, Maastricht, Amsterdam, Nice, Lisbon, Paris (France)
Parties	Member states of the European Union
Language	Treaties

Treaties of the European Union

The treaties establishing and amending the European Community and the European Union are binding accords between sovereign member states—not a single constitution—and define the competences of institutions such as the European Commission, European Parliament, Council of the European Union, European Council, and the Court of Justice of the European Union. From the Treaty of Paris to the Treaty of Lisbon the instrumentarium evolved through accession treaties, protocol amendments and constitutional attempts including the Treaty of Rome and the Maastricht Treaty.

Overview and Historical Development

The origins lie in post‑war accords like the Treaty of Paris creating the European Coal and Steel Community and the Treaty of Rome creating the European Economic Community and the European Atomic Energy Community. Subsequent major steps include the Single European Act, the Maastricht Treaty, the Amsterdam Treaty, the Nice Treaty and the Lisbon Treaty, alongside accession instruments for United Kingdom, Ireland, Denmark, Greece, Spain, Portugal, Austria, Sweden, Finland, Cyprus, Malta, Poland, Hungary, Czech Republic, Slovakia, Slovenia, Estonia, Latvia, Lithuania, Bulgaria, Romania and Croatia. Parallel initiatives such as the European Political Cooperation and the Schengen Agreement also shaped practice by way of protocol or treaty adjustment. Proposals including the European Constitution and the Draft Treaty establishing a Constitution for Europe influenced the Lisbon Treaty outcomes after referendums like those in France and Netherlands rejected constitutional text.

Core Treaties and Amendments

Core instruments are the Treaty on European Union (TEU) and the Treaty on the Functioning of the European Union (TFEU), consolidated by the Lisbon Treaty which amended the Treaty establishing the European Community and repealed the Treaty establishing the European Coal and Steel Community upon later rearrangements. Foundational texts include the Paris Treaty and the Rome Treaty; important protocols and acts include the Single European Act, protocol annexes from the Amsterdam Treaty and institutional changes from the Nice Treaty. Accession treaties such as the 2003 Accession Treaty altered competencies and introduced protocols for Cyprus and Malta. Specific amendments addressed issues in the Eurozone via the Treaty on Stability, Coordination and Governance in the Economic and Monetary Union and adjustments through intergovernmental agreements like the Treaty on Stability, Coordination and Governance.

Institutional Framework and Legal Effects

Treaties allocate powers among bodies including the European Commission, Council of the European Union, European Council, European Parliament, Court of Justice of the European Union, European Central Bank and national Constitutional Courts. The TEU and TFEU set primary law, which interacts with secondary legislation such as European directives, European regulations, European decisions, and protocols annexed to accession treaties. Judicial doctrines from the European Court of Justice including direct effect, supremacy of EU law, and the Cassis de Dijon principle operationalize treaty provisions alongside rulings from national courts like the Bundesverfassungsgericht and the Conseil d'État and constitutional rulings such as Solange and Honeywell‑style decisions.

Treaty-Making Procedures and Ratification

Amendments follow procedures in TEU articles requiring either ordinary revision via an Intergovernmental Conference convened by the European Council and ratification by national parliaments and/or referendums (as occurred in Ireland, Denmark, France, Netherlands). Simplified revision procedures and passerelle clauses were used infrequently; special arrangements used enhanced cooperation under TEU provisions invoked by states including Belgium, France, Germany, Italy and Spain. Ratification failures such as the 2005 French referendum and the 2005 Dutch referendum led to renegotiation culminating in the Lisbon and opt‑outs for members like United Kingdom and Poland.

Impact on EU Policies and Competences

Treaty provisions define competences in areas such as the internal market, competition policy, trade via the Common Commercial Policy, common foreign and security policy where the High Representative of the Union for Foreign Affairs and Security Policy operates, and monetary policy through the European Central Bank and the Eurozone. Sectoral changes traceable to treaties include the Single Market established by the Single European Act, consumer protection expansions, environmental competence growth after Maastricht, and justice and home affairs coordination following the Schengen Agreement and the Amsterdam reforms. Treaty delineation between exclusive, shared and supporting competences affects legislation in fields like agriculture under the Common Agricultural Policy and fisheries under the Common Fisheries Policy.

Case Law, Interpretation and Amendment Practice

The Court of Justice of the European Union interprets treaty text through cases including Van Gend en Loos, Costa v ENEL, Cassis de Dijon, Kadi v Council and later rulings on citizenship rights such as Grzelczyk and Rottmann. National constitutional courts including the Bundesverfassungsgericht produced landmark decisions on treaty effects, sovereignty and democratic legitimacy such as the Lisbon judgment and interactions with doctrines like primacy and proportionality. Practice shows treaties are often amended via intergovernmental compromise (e.g., Nice Treaty institutional tweaks) or through juridical reinterpretation by the CJEU and national courts, with informal innovations like enhanced cooperation and bilateral protocols addressing specific member state concerns.

Challenges, Reforms and Future Prospects

Contemporary challenges include treaty adaptation to crises such as the 2008 financial crisis, Eurozone crisis, the COVID‑19 pandemic and Brexit, pressure for deeper integration from actors like the European Commission and European Parliament, and resistance signalled by national parliaments and courts including Poland and Hungary. Reform proposals range from a new constitutional text inspired by the Draft Treaty establishing a Constitution for Europe to incremental treaty change via accession and protocols; mechanisms include the Convention on the Future of Europe model and simplified revision clauses in the Lisbon Treaty. Future prospects hinge on member state consensus at summits of the European Council, the role of transnational parties like the European People's Party and Party of European Socialists, and jurisprudential balances struck by the European Court of Justice and national constitutional tribunals.

Category:European Union treaties