Supremacy of European Union Law

The supremacy of European Union law is a fundamental principle of EU law that establishes the hierarchy of legal norms within the legal system of the European Union. It essentially means that EU law takes precedence over national laws of EU member states in cases of conflict or inconsistency.

Treaty basis: The principle of supremacy is derived from the EU treaties, which are the founding legal documents of the EU. The treaties explicitly state that EU law has primacy over national laws. This principle was first established by the Court of Justice of the European Union (CJEU) in the landmark case of Costa v ENEL in 1964.

Primacy and direct effect: The principle of supremacy ensures that EU law prevails over conflicting national laws. It means that if there is a conflict between EU law and the laws of a member state, EU law takes precedence and must be applied and enforced by national courts. In addition to primacy, certain EU laws also have direct effect, meaning that individuals can directly invoke them before national courts.

Harmonisation and uniform application: The supremacy of EU law is essential for ensuring the harmonisation and uniform application of laws across the EU. It prevents fragmentation and inconsistencies in the interpretation and application of EU law by national authorities, promoting legal certainty and the functioning of the internal market.

National court obligation: National courts have an obligation to ensure the application of EU law and to set aside any conflicting national laws. They are required to interpret and apply national laws in line with EU law and to refer questions of EU law to the CJEU for preliminary rulings if necessary. National courts act as guardians of EU law within their respective jurisdictions.

Limits and principles of proportionality: While EU law has supremacy over national laws, it must still respect the principles of proportionality and subsidiarity. EU legislation should only be adopted when it is necessary and when the objectives cannot be sufficiently achieved by member states individually. This ensures a balance between the EU's central authority and the autonomy of member states.

Loyalty and cooperation: Member states have a duty of loyalty and cooperation towards the EU. They are expected to comply with EU law, implement EU directives, and ensure effective enforcement of EU rules within their territories. Member states are also required to cooperate with the EU institutions and each other to achieve the objectives of the EU.

The principle of the supremacy of EU law is a foundational element of the EU's legal framework. It ensures the effectiveness and uniformity of EU law across member states, promotes legal certainty, and contributes to the development and functioning of the EU as a single legal order.
Back to blog
UOLLB SQE Turbocharge

UOLLB SQE Turbocharge

Get ready for the SQE1 with high-performance SQE Study Guides developed by UOLLB and published by UOL Press to revolutionise your study method and exam strategy.

Turbocharge SQE Performance Here

UOL Case Bank

Upon joining, you become a valuable UOL student and gain instant access to over 2,100 essential case summaries. UOL Case Bank is constantly expanding.
Speed up your revision with us now👇

Subscribe Now

Where are our students from?

Council of Europe
Crown Prosecution Service
Baker Mckenzie 
Yale University
University of Chicago
Columbia University
New York University
University of Michigan 
INSEAD
University of London
University College London (UCL)
London School of Economics (LSE)
King’s College London (KCL)
Royal Holloway, University of London 
Birkbeck, University of London
SOAS, University of London
University of Manchester
University of Zurich
University of York
Brandeis University
University of Exeter
University of Sheffield
Boston University
University of Washington
University of Leeds
University of Law
University of Kent
University of Hull
Queen’s University Belfast
Toronto Metropolitan University
Hong Kong University of Science and Technology
University of Buckingham
ESSEC Business School

  • Criminal Practice

    Diagrams and Charts

    Our carefully designed diagrams and charts will guide you through complex legal issues.

  • Criminal Law

    Clear and Succinct Definitions

    Key concepts are concisely defined to help you understand legal topics quickly.

  • Property Law

    Statutory Provisions

    Statutory provisions are provided side by side with legal concepts to help you swiftly locate the relevant legislation.

  • Public Law

    Case Summaries

    We have summarised important cases for you so that you don't need to read long and boring cases.

  • Evidence

    Rules and Exceptions

    Rules and exceptions are clearly listed so that you know when a rule applies and when it doesn't.

  • Company Law

    Terminology

    Legal terms and key concepts are explained at the beginning of each chapter to help you learn efficiently.

  • Case Law

    Case law is provided side by side with legal concepts so that you know how legal principles and precedents were established.

  • Law Exam Guide

    Law Essay Guide

    You will learn essential law exam skills and essay writing techniques that are not taught in class.

  • Law Exam Guide

    Problem Question Guide

    We will show you how to answer problem questions step by step to achieve first-class results.

  • Conflict of Laws

    Structured Explanations

    Complex legal concepts are broken down into concise and digestible bullet point explanations.

  • Legal System and Method

    Legal Research

    You will learn legal research techniques with our study guide and become a proficient legal researcher.

  • Jurisprudence and Legal Theory

    Exam-focused

    All essential concepts, principles, and case law are included so that you can answer exam questions quickly.