The Lisbon Treaty Decision (BVerfGE 123, 267) and Constitutional Limits on Integration

The Lisbon Treaty Decision (BVerfGE 123, 267, 30 June 2009) is the most comprehensive judgment of the Federal Constitutional Court on the constitutional limits of European integration. Delivered shortly before the entry into force of the Lisbon Treaty, the decision refined the doctrines of constitutional identity review and ultra vires review, identified specific areas of national constitutional identity that cannot be transferred to the European Union, and required strengthened parliamentary participation in EU decision-making.

The Challenge

The constitutional complaints challenged the ratification of the Treaty of Lisbon and the accompanying German implementing legislation. The complainants argued that the Treaty transferred excessive competences to the European Union, that it created a European federal state in disguise, and that it violated the democratic principle, the social state principle, and the constitutional identity of the Grundgesetz. The Court dismissed most of the complaints as inadmissible or unfounded but used the decision to clarify the constitutional framework for European integration and to require additional parliamentary safeguards. The Court declared the accompanying legislation (Begleitgesetze) to ratification partially unconstitutional, requiring the Bundestag and the Bundesrat to strengthen the mechanisms for parliamentary participation in EU affairs.

Constitutional Identity and Non-Transferable Core

The Lisbon Decision identified specific constitutional principles that form the core of German constitutional identity and cannot be transferred to the European Union. The Court held that the constitutional identity (Verfassungsidentität) protected by Article 79(3) GG includes the following essential elements: the right to vote and the democratic self-governance of the people, the budgetary autonomy of the Bundestag, the administration of criminal justice and the protection of fundamental rights in criminal proceedings, the regulation of the use of force (police and military), fundamental decisions on family law and education, decisions concerning the religious and worldview neutrality of the state, and the maintenance of the social state principle. The Court emphasised that these areas are not merely policy preferences but core elements of German constitutional identity that cannot be surrendered to the European Union even by qualified majority in the Bundestag and Bundesrat.

Ultra Vires Review

The Lisbon Decision confirmed and refined the ultra vires review (Ultra-vires-Kontrolle) established in the Maastricht Decision. The Court held that it would review whether EU institutions act within the limits of the competences conferred upon them by the treaties. If an EU institution exceeds its competences in a manner that manifestly violates the principle of conferral, the Court would declare the EU measure inapplicable in Germany. The ultra vires review is to be exercised with restraint, respecting the ECJ’s primary jurisdiction over the interpretation of EU law and the preliminary reference procedure under Article 267 TFEU. The Court established a manifest error (offensichtlicher Verstoss) standard: only a clear and qualified excess of competences would trigger the ultra vires review, not every alleged violation of the treaties.

Integrationsverantwortung

The Lisbon Decision developed the concept of Integrationsverantwortung (responsibility for integration), requiring that the German constitutional organs actively exercise their responsibility for ensuring that European integration remains within constitutional limits. The Court held that the Bundestag and the Bundesrat must participate in decisions concerning the transfer of sovereign powers and the exercise of EU competences. The implementing legislation accompanying the Lisbon Treaty was found unconstitutional in part because it did not provide sufficient parliamentary participation in EU decision-making, particularly concerning the use of passerelle clauses, the flexibility clause (Article 352 TFEU), and the enhanced cooperation procedures. The Court required that any transfer of sovereign powers or any significant extension of EU competences must be approved by the Bundestag and the Bundesrat in a manner that satisfies the constitutional requirements of democratic legitimation.

Parliamentary Participation

The Court required the legislature to strengthen the mechanisms for parliamentary participation in EU affairs, leading to the enactment of the Act on Cooperation between the Federation and the Länder in EU Affairs (EUZBLG) and the Act on the Exercise of the Rights of the Bundestag and the Bundesrat in EU Affairs (IntVG). These statutes require that the Bundestag and the Bundesrat give their approval before the federal government may agree to certain EU decisions, including the use of passerelle clauses, the flexibility clause, and decisions extending EU competences. The scrutiny reserve (Integrationsvorbehalt) allows the Bundestag to establish a binding mandate for the federal government’s negotiating position in the Council, ensuring that parliamentary views are reflected in EU decision-making.

The Social State Principle

The Lisbon Decision addressed the social state principle (Sozialstaatsprinzip), holding that the European Union does not provide a sufficient level of social protection to replace the German social state. The Court held that fundamental decisions about social policy, including the structure of the social insurance system, the level of social benefits, and the distribution of social burdens, must remain under the control of the German legislature. The social state principle forms part of German constitutional identity and may not be surrendered to the European Union, requiring that the Bundestag retain sufficient competences to shape social policy according to national preferences.

Impact and Legacy

The Lisbon Decision is the most important constitutional judgment on European integration since the Maastricht Decision. It established an authoritative catalogue of constitutional identity elements that limit European integration, strengthened parliamentary participation in EU affairs, and refined the ultra vires and identity review doctrines. The decision has influenced constitutional developments in other member states, including France, Denmark, and the United Kingdom, where similar questions about national constitutional limits on European integration have arisen. The judgment confirmed Germany’s commitment to European integration while insisting on constitutional limits that preserve national democratic self-governance.