The Principle of Conferral under Article 5 TEU

The principle of conferral is the foundational constitutional principle defining the limits of European Union competence. Article 5(2) TEU provides that the Union shall act only within the limits of the competences conferred upon it by the Member States in the Treaties to attain the objectives set out therein. Competences not conferred upon the Union in the Treaties remain with the Member States. The principle establishes that the EU is a union of limited attributed powers, in contrast to the plenary legislative competence of sovereign states. Together with subsidiarity and proportionality, conferred power is one of the three horizontal principles governing the exercise of EU competence.

The Nature of Conferral

The principle of conferral reflects the constitutional foundation of the EU as an organisation of limited attributed powers. The Member States, as the masters of the Treaties (Herren der Verträge), have voluntarily transferred specific sovereign powers to the Union, while retaining all residual competences. Article 4(1) TEU confirms that competences not conferred upon the Union in the Treaties remain with the Member States. This distribution of competences is not merely a political statement but a legally enforceable limitation on EU action, subject to review by the CJEU.

The CJEU has enforced the principle of conferral as a ground for annulment under Article 263 TFEU. In the Tobacco Advertising case (Case C-376/98), the Court annulled Directive 98/43/EC prohibiting tobacco advertising, holding that the Directive had been adopted on an incorrect legal basis and exceeded the competence of the Community by regulating public health, which fell primarily within Member State competence. The judgment demonstrated that the principle of conferral is judicially enforceable and that the Court will police the boundaries of EU competence.

Categories of Competence

Article 2 TFEU establishes three categories of Union competence. Exclusive competence (Article 3 TFEU) means only the Union may legislate and adopt legally binding acts; Member States may do so only if empowered by the Union or to implement Union acts. Exclusive competence covers the customs union, competition rules necessary for the functioning of the internal market, monetary policy for Member States whose currency is the euro, the conservation of marine biological resources under the common fisheries policy, and the common commercial policy.

Shared competence (Article 4 TFEU) means both the Union and Member States may legislate and adopt legally binding acts, but Member States exercise their competence to the extent that the Union has not exercised, or has decided to cease exercising, its competence. Shared competence is the default category, applying to areas including the internal market, social policy (for aspects defined in the TFEU), economic, social and territorial cohesion, agriculture and fisheries, environment, consumer protection, transport, trans-European networks, energy, the Area of Freedom, Security and Justice, and common safety concerns in public health matters. The principle of pre-emption governs shared competence: once the Union acts, Member States may no longer act inconsistently with the Union measure.

Supporting, coordinating, or supplementary competence (Articles 5–6 TFEU) means the Union may carry out actions to support, coordinate, or supplement Member State action, without thereby superseding their competence in these areas. Union action cannot harmonise national laws in areas of supporting competence, which include protection and improvement of human health, industry, culture, tourism, education, vocational training, youth and sport, civil protection, and administrative cooperation.

Implied Powers

The doctrine of implied powers supplements the principle of conferral. The CJEU has recognised that competences expressly conferred by the Treaties include those powers that are necessary to give effect to the express powers, particularly where necessary to ensure the effectiveness (effet utile) of Treaty provisions. In ERTA (Case 22/70), the Court held that the Community has the power to enter into international agreements not only where the Treaty expressly confers external power but also where internal competence has been exercised, because the external power necessarily flows from the internal competence to achieve Treaty objectives.

The implied powers doctrine has been applied cautiously. The CJEU requires a clear link between the implied power and the express objective or competence. In Opinion 2/94 on ECHR accession, the Court held that Article 352 TFEU could not be used to accede to the ECHR because such a fundamental constitutional change required express Treaty authorisation, which was subsequently provided by Article 6(2) TEU as amended by the Treaty of Lisbon.

The Flexibility Clause

Article 352 TFEU provides a flexibility clause enabling the Union to act where action is necessary within the framework of the policies defined by the Treaties to attain one of the objectives set out in the Treaties, and the Treaties have not provided the necessary powers. The clause requires unanimity in the Council on a proposal from the Commission, with the consent of the European Parliament. National parliaments must be notified and may object on subsidiarity grounds.

The flexibility clause is not a source of unlimited power. Article 352(3) provides that measures adopted under Article 352 may not entail harmonisation of Member State laws where the Treaties exclude such harmonisation. Article 352(4) excludes the clause from application to the Common Foreign and Security Policy. The clause may not be used to circumvent the limits of conferred competence or to create new policies beyond the framework of existing objectives. The CJEU interpreted Article 352 strictly in Opinion 2/94, holding that it could not be used to bring about fundamental changes in the constitutional structure of the Union.

Subsidiarity and Proportionality

Article 5(3)–(4) TEU establishes the principles of subsidiarity and proportionality as limitations on the exercise of conferred competences. Under subsidiarity, in areas of shared competence, the Union shall act only if and insofar as the objectives of the proposed action cannot be sufficiently achieved by the Member States but can be better achieved at Union level, by reason of the scale or effects of the proposed action.

Protocol No. 2 on the application of subsidiarity and proportionality establishes a mechanism for monitoring subsidiarity compliance. The Commission must submit draft legislative acts to national parliaments, which may issue reasoned opinions within eight weeks if they consider the proposal violates subsidiarity. If one-third of national parliaments object (the yellow card procedure), the proposal must be reviewed. If a majority of national parliaments object in the ordinary legislative procedure (orange card), the Commission must review the proposal and may maintain, amend, or withdraw it, with a reasoned justification.

Proportionality under Article 5(4) requires that the content and form of Union action not exceed what is necessary to achieve the objectives of the Treaties. The principle applies to all Union action, regardless of the competence category, and requires assessment of the nature and intensity of the action, the least restrictive means of achieving the objective, and the balance between benefits and burdens.

Limits on EU Action and Judicial Protection

The principle of conferral imposes enforceable limits on EU action. Any EU measure must be based on a specific Treaty legal basis conferring competence to act. The choice of legal basis must be based on objective factors amenable to judicial review, including the aim and content of the measure. An incorrect legal basis may render the measure void.

The CJEU exercises judicial review of competence limits under Article 263 TFEU. Member States, EU institutions, and, under certain conditions, individuals may challenge EU acts for lack of competence. National courts may also refer questions of validity under Article 267 TFEU. The German Federal Constitutional Court has developed a doctrine of ultra vires review (outwith the conferred powers), reserving the right to examine whether EU acts remain within the limits of conferred competence, as articulated in the Maastricht (1993), Lisbon (2009), and PSPP (2020) judgments. While the CJEU has not endorsed this national ultra vires review, the dialogue between the two courts reflects the constitutional dynamic at the heart of the EU’s federal balance.