Delegated Acts and Implementing Acts: Regulatory Powers Under EU Law

Delegated Acts and Implementing Acts: Regulatory Powers Under EU Law

1. Introduction

The adoption of an EU legislative act does not always complete the regulatory process. Regulations, directives, and decisions frequently establish a general legal framework but leave certain technical, administrative, or operational matters to be developed later. Scientific knowledge may advance, market conditions may change, new technical standards may emerge, and national authorities may require common procedures to ensure consistent application of EU law.

The European Union therefore operates a system in which the institutions adopting primary legislative measures may confer certain powers on the European Commission to adopt additional binding acts. These powers are governed principally by Articles 290 and 291 of the Treaty on the Functioning of the European Union (TFEU).

The Treaties distinguish between two categories:

• Delegated acts, under Article 290 TFEU, allow the Commission to supplement or amend certain non-essential elements of a legislative act through non-legislative acts of general application.
• Implementing acts, under Article 291 TFEU, allow the Commission or, in specific circumstances, the Council to establish uniform conditions for implementing legally binding EU acts.

Although both categories involve the exercise of regulatory powers outside the ordinary legislative procedure, their constitutional purposes are different.

Delegated acts concern the development of the legislative framework itself. They permit the Commission to supplement or amend non-essential elements of legislation within limits expressly established by the legislature.

Implementing acts concern the practical and consistent application of existing binding law. They do not authorise the Commission to modify the underlying legal framework but allow it to establish uniform conditions where such uniformity is necessary.

The distinction is important because it determines the scope of the Commission’s authority, the role of the European Parliament and the Council, the participation of Member States, and the procedures through which the resulting acts may be adopted and challenged.

The system also raises a fundamental constitutional question: how can the EU legislature delegate regulatory responsibilities without surrendering its own legislative authority or undermining the institutional balance established by the Treaties?

2. The Constitutional Framework: Articles 290 and 291 TFEU

2.1. The development of delegated and implementing powers

Before the Treaty of Lisbon entered into force, EU law-making relied on a less clearly differentiated system of implementing powers and regulatory measures adopted by the Commission.

The Treaty of Lisbon introduced a more explicit distinction between the delegation of powers to supplement or amend legislation and the conferral of powers to implement legally binding acts.

Articles 290 and 291 TFEU now provide the principal constitutional framework.

This distinction reflects the different responsibilities involved in making and applying EU law.

The European Parliament and the Council, acting as the Union legislature, determine the essential policy choices through legislative procedures. The Commission may subsequently be authorised to develop certain non-essential elements or establish uniform implementation conditions.

The resulting acts are binding, but they are not legislative acts within the meaning of Article 289(3) TFEU because they are not adopted through the ordinary or a special legislative procedure.

They form part of the Union’s secondary law and remain subject to the Treaties and the legislative act that authorises them.

2.2. Article 290 TFEU: Delegation of power

Article 290(1) TFEU provides that a legislative act may delegate to the Commission the power to adopt non-legislative acts of general application to supplement or amend certain non-essential elements of that legislative act.

The provision establishes several constitutional requirements.

First, the delegation must originate in a legislative act. The Commission cannot assume delegated powers merely because it considers additional regulation useful.

Second, the act must be of general application. Delegated acts are not intended to determine isolated individual cases but to establish rules applying to a category of situations or persons.

Third, the delegated act may supplement or amend only non-essential elements of the legislative act.

Fourth, the legislative act must explicitly define the objectives, content, scope, and duration of the delegation.

Finally, the legislative act must establish the conditions governing the exercise of the delegated power, including the possibility for the European Parliament or the Council to revoke the delegation or object to an adopted delegated act.

These requirements ensure that the Commission exercises authority within a framework determined by the legislature.

2.3. Article 291 TFEU: Implementation of legally binding acts

Article 291 TFEU addresses the implementation of legally binding EU acts.

Under Article 291(1), Member States must adopt the measures of national law necessary to implement legally binding Union acts.

This establishes the general rule that implementation is primarily a responsibility of Member States.

However, where uniform conditions for implementing legally binding Union acts are needed, Article 291(2) permits the conferral of implementing powers on the Commission or, in duly justified specific cases and in the circumstances provided for in Articles 24 and 26 TEU, on the Council.

Article 291(3) provides that the European Parliament and the Council establish the rules and general principles governing mechanisms for control by Member States of the Commission’s exercise of implementing powers.

These arrangements are implemented principally through Regulation (EU) No 182/2011, commonly associated with the comitology system.

The purpose of Article 291 is therefore not to authorise the Commission to supplement or amend the substance of legislation. It is to establish uniform conditions where the consistent implementation of binding EU law requires coordinated action.

3. Delegated Acts Under Article 290 TFEU

3.1. Nature and purpose

A delegated act is a non-legislative act of general application adopted by the Commission on the basis of a delegation contained in a legislative act.

The legislature may determine the principal regulatory framework while allowing the Commission to address certain non-essential elements that require technical development, updating, or additional specification.

This arrangement is useful in fields where the underlying legislation must remain adaptable.

Examples include:

• Technical standards for products and services.
• Detailed requirements concerning food safety and labelling.
• Scientific and technical criteria in environmental regulation.
• Requirements concerning animal and plant health.
• Technical annexes to financial and market legislation.
• Specifications relating to transport and digital systems.
• Updates to lists, classifications, and regulatory thresholds where the basic act permits such delegation.

The advantage is that technical developments can be accommodated without reopening the entire legislative procedure each time a non-essential element needs to be adjusted.

However, administrative convenience cannot justify an unlimited transfer of legislative authority. The Commission may act only within the limits established by the legislative act and Article 290.

3.2. Supplementing and amending a legislative act

Article 290 allows two related forms of delegated action: supplementing and amending.

Supplementing a legislative act means adding rules that develop its non-essential elements without replacing or altering the existing legislative provisions.

For example, a legislative regulation may establish a general framework for the protection of consumers and authorise the Commission to adopt additional technical requirements concerning the information that must accompany a particular category of product.

The delegated act adds detail to the existing framework while remaining consistent with its objectives and essential provisions.

Amending a legislative act means changing certain non-essential elements already contained in the legislative act.

For example, the basic legislation may contain an annex listing technical substances, product categories, or scientific classifications. If the legislative act expressly permits the Commission to update that annex through delegated acts, the Commission may amend it within the limits of the delegation.

The distinction matters because amending legislation is not the same as merely explaining how it should be applied.

A delegated act may change the content of the basic legislative framework, but only in relation to non-essential elements and only where the legislature has expressly authorised that power.

3.3. Essential elements cannot be delegated

The most important constitutional limit on delegated acts is the prohibition on delegating essential elements of a legislative act.

Essential elements are those provisions that require political choices falling within the responsibility of the EU legislature. They cannot be transferred to the Commission merely because the subject is technically complex or difficult to regulate.

The distinction is not determined solely by whether a provision appears in the main body of a regulation or in an annex.

An annex may contain essential elements, just as a provision in the main text may concern a non-essential technical detail.

The assessment depends on the nature of the subject matter, the policy choices involved, and the significance of the provision within the legislative framework.

For example, a legislative act establishing a system of environmental protection may leave the Commission authority to update certain technical measurement methods. However, the fundamental decision concerning the level of environmental protection, the persons subject to the principal obligations, or the essential conditions governing restrictions may need to remain within the legislative act itself.

The Commission cannot use a delegated act to introduce a new policy direction that the legislature did not authorise.

3.4. The Court of Justice and essential elements

The Court of Justice has repeatedly emphasised the importance of reserving essential elements to the legislature.

In Parliament v Council (Case C-355/10), concerning surveillance of the external sea borders, the Court examined whether certain provisions involved essential elements that could not be determined through an implementing measure.

The Court explained that provisions requiring political choices falling within the responsibilities of the EU legislature must be adopted through the appropriate legislative process.

Although the case concerned the boundaries of implementing powers, its reasoning is relevant to the broader constitutional distinction between legislative responsibility and executive action.

The Court’s approach prevents institutions from transferring fundamental policy decisions to the Commission under the label of technical regulation.

The legislature must itself establish the essential framework, leaving only those matters that can lawfully be dealt with through delegated or implementing powers.

3.5. Defining the delegation

Article 290(1) requires the legislative act to explicitly define four elements:

Objectives. The act must identify what the delegation is intended to achieve.

Content. It must describe the subject matter and type of rules the Commission may adopt.

Scope. It must establish the boundaries of the Commission’s authority, including the matters that may be supplemented or amended.

Duration. It must specify the period for which the delegation is conferred.

The duration requirement does not mean that every delegated power must be temporary in the sense of lasting only a few months or years. A legislative act may provide for an initial period and automatic extensions unless the Parliament or Council objects. The arrangement must nevertheless be defined in the basic act.

The more precisely the delegation is drafted, the easier it becomes to determine whether the Commission has remained within its authority.

A vague delegation may create uncertainty concerning the boundaries between legislative responsibility and executive regulation.

3.6. Revocation of delegated powers

Article 290(2) TFEU permits the European Parliament or the Council to revoke the delegation of power.

The legislative act must establish the conditions under which revocation may take place.

The revocation mechanism provides an institutional safeguard. It allows either co-legislator to withdraw the Commission’s authority where it considers that the delegation should no longer continue.

Revocation operates prospectively. It does not automatically invalidate delegated acts that were already adopted and have entered into force.

The legal consequences of existing acts must be considered separately, including whether they remain in force, are amended, or are repealed through another lawful procedure.

The possibility of revocation is important because it ensures that delegated authority remains subject to legislative control.

3.7. Objection to a delegated act

The Parliament and Council may also object to an individual delegated act.

Article 290(2) allows the legislative act to provide that a delegated act enters into force only if neither institution has expressed an objection within the period specified in the basic act.

The objection period is usually two months, although the basic act may provide for an extension.

The Parliament acts by a majority of its component Members. The Council acts by qualified majority.

If either institution objects within the prescribed period, the delegated act does not enter into force.

This is different from revoking the delegation itself.

Revocation withdraws the Commission’s authority to adopt future delegated acts under the relevant empowerment. An objection prevents a particular delegated act from entering into force.

The distinction allows the legislature to reject an individual regulatory measure without necessarily terminating the entire delegation.

3.8. Consultation before adoption

Before adopting a delegated act, the Commission generally consults experts designated by the Member States.

This consultation is part of the institutional arrangements governing delegated acts and contributes technical and national expertise.

However, it should not be confused with comitology.

Under Article 290, the principal formal control mechanism lies with the Parliament and Council through their rights of objection and revocation.

The expert consultation supports the Commission’s preparation of the delegated act but does not transfer the formal decision to a committee of Member State representatives.

The Commission must also respect the applicable transparency and consultation commitments established by the institutional framework and the relevant legislative act.

3.9. Form of delegated acts

Article 290(3) TFEU requires the word “delegated” to appear in the title of delegated acts.

They may take the form of delegated regulations, delegated directives, or delegated decisions, depending on the legal framework and the content of the act.

Their form does not change their legal classification as non-legislative acts adopted under Article 290.

For example, a delegated regulation is binding and directly applicable in accordance with its legal character as a regulation, but it is not a legislative act adopted by the Parliament and Council through a legislative procedure.

4. Implementing Acts Under Article 291 TFEU

4.1. Nature and purpose

Implementing acts are non-legislative acts adopted to establish uniform conditions for the implementation of legally binding EU acts.

The central objective is consistency.

EU legislation may apply throughout the Union, but national authorities may interpret administrative requirements differently, use different procedures, or apply inconsistent technical standards.

Where uniform implementation is necessary, the Commission may be authorised to adopt detailed rules governing how the existing legislation is to operate.

Implementing acts are used in many regulatory fields, including:

• Agriculture and food safety.
• Public health and medicinal products.
• Internal market regulation.
• Customs and taxation.
• Financial and administrative systems.
• Environmental reporting.
• Technical certification and product approval.
• Data exchange and administrative cooperation.

The underlying legislative act establishes the legal framework. The implementing act provides the common operational arrangements necessary for its consistent application.

4.2. Member States’ primary responsibility

Article 291(1) TFEU establishes that Member States must adopt all measures of national law necessary to implement legally binding Union acts.

This is an important constitutional principle.

The Union does not generally centralise all implementation functions in the Commission. National authorities remain responsible for applying EU law through their administrative systems and national legal procedures.

However, certain matters require common conditions across the Union.

For example, where EU legislation establishes a common authorisation system, different national procedures could undermine the uniform application of the underlying rules.

An implementing act may therefore establish common forms, technical requirements, procedures, or administrative arrangements.

The Commission’s authority is complementary to the implementation responsibilities of Member States. It does not eliminate their general responsibility under Article 291(1).

4.3. Conferral of implementing powers

Article 291(2) permits the conferral of implementing powers on the Commission where uniform conditions for implementation are needed.

In duly justified specific cases and in the circumstances provided for in Articles 24 and 26 TEU, the Council may also exercise implementing powers.

The Commission is therefore the ordinary institution entrusted with implementing powers, but the Treaties recognise limited circumstances in which the Council may act.

The basic legal act must identify the implementing power and establish the conditions governing its exercise.

The Commission cannot create an implementing power independently or use Article 291 as a general source of authority to regulate any matter it considers necessary.

4.4. Implementing acts cannot amend the basic act

The fundamental limitation on implementing acts is that they must remain within the framework of the legislation they implement.

Unlike delegated acts, implementing acts cannot supplement or amend the basic legislative act in the sense contemplated by Article 290.

They may establish detailed rules necessary to apply the existing legal framework, but they cannot alter the essential legal obligations or change the policy choices made by the legislature.

For example, if an EU regulation establishes common conditions for placing a particular category of product on the market, an implementing act may establish a uniform application form or technical procedure for verifying compliance.

It cannot use that procedural power to introduce a new substantive prohibition that the basic regulation does not authorise.

The distinction is between determining how existing law is to be applied and changing what the law requires.

4.5. General and individual application

Implementing acts may have general or individual application, depending on the nature of the authority conferred and the subject matter.

A general implementing act may establish uniform administrative requirements applicable to a broad category of cases.

An individual implementing decision may determine a specific matter within a regulatory framework, such as the approval, authorisation, or recognition of a particular application where the underlying legislation provides for that procedure.

This differs from delegated acts, which are acts of general application under Article 290.

The possibility of individual implementing measures is important in sectors where EU law requires centralised decisions or uniform administrative determinations.

5. Comitology: Member State Control of Implementing Powers

5.1. Meaning and legal foundation

The term “comitology” refers to the system through which committees composed of representatives of Member States assist the Commission in exercising implementing powers.

The legal framework is established by Regulation (EU) No 182/2011, which lays down the rules and general principles concerning mechanisms for control by Member States of the Commission’s exercise of implementing powers.

The committees are chaired by a representative of the Commission and include representatives of all Member States.

They allow national governments to participate in the supervision of implementing measures while preserving the Commission’s responsibility for adopting the acts where it has been given the relevant power.

Comitology is not an additional legislative procedure. It is a mechanism for controlling the exercise of implementing powers under Article 291.

5.2. The advisory procedure

The advisory procedure is generally used for implementing acts that do not fall within the circumstances requiring the examination procedure.

The committee delivers an opinion on the draft implementing act.

The Commission must take the utmost account of the committee’s opinion. If the committee expresses disagreement, the Commission should consider the reasons and the implications before deciding how to proceed.

However, the advisory procedure does not ordinarily give the committee the same power to prevent adoption that exists under a negative opinion in the examination procedure.

The Commission remains responsible for the decision, subject to the applicable legal requirements and its obligation to take the committee’s opinion seriously.

5.3. The examination procedure

The examination procedure applies in particular to implementing acts of general scope and to certain other measures identified by Regulation 182/2011.

It is used where the implementing measure may have significant consequences or where the underlying legislation specifically requires it.

The committee examines the Commission’s draft and delivers an opinion, generally by qualified majority.

The consequences depend on the committee’s position.

Positive opinion. If the committee delivers a positive opinion, the Commission must adopt the draft implementing act.

Negative opinion. If the committee delivers a negative opinion, the Commission may not adopt the draft under the ordinary examination procedure.

No opinion. If the committee delivers no opinion, the Commission may, subject to the conditions and exceptions in Regulation 182/2011, adopt the draft. Certain categories of measures are subject to additional restrictions.

Where the Commission cannot adopt the draft because of a negative opinion or other procedural obstacle, the regulation provides mechanisms for reconsideration, including referral to an appeal committee in specified circumstances.

The examination procedure therefore gives Member State representatives a substantial role in controlling the Commission’s implementing powers.

5.4. The appeal committee

Regulation 182/2011 provides for an appeal committee as a further stage in certain situations where the examination committee has not delivered the result necessary for adoption.

The appeal committee is also composed of representatives of Member States and is chaired by the Commission.

Its purpose is to provide a further opportunity for Member State representatives to consider the draft and determine whether the Commission should be permitted to proceed.

The appeal committee does not replace the Commission as the institution responsible for adopting the implementing act. It provides an additional control mechanism within the comitology system.

5.5. Urgent implementing acts

Certain situations require immediate action.

Regulation 182/2011 permits the adoption of immediately applicable implementing acts in duly justified cases where the basic legislative act allows for such a procedure.

The Commission may adopt the act before obtaining the committee’s opinion, subject to the subsequent consultation and review requirements established by the regulation.

This mechanism is designed for circumstances in which delay could undermine the purpose of the legislation or create significant risks.

It is not a general exception allowing the Commission to disregard comitology whenever it considers a measure urgent.

The conditions must be satisfied, and the implementing act remains subject to the applicable procedural safeguards.

5.6. The comitology register and transparency

The comitology system includes procedures for recording committee meetings, draft measures, opinions, and other relevant documents.

The Commission maintains a public comitology register through which information about implementing procedures can be accessed.

Transparency is important because implementing acts may have significant consequences for businesses, national administrations, and individuals.

The availability of draft texts and committee information helps interested parties understand how the Commission exercises its powers and how Member States participate in the process.

It also allows scrutiny of whether the Commission has acted within the authority conferred by the basic legal act.

6. Delegated Acts and Implementing Acts Compared

Although both categories are non-legislative and binding, their constitutional purposes differ.

Feature	Delegated acts	Implementing acts
Legal basis	Article 290 TFEU	Article 291 TFEU
Primary purpose	Supplement or amend non-essential elements of a legislative act	Establish uniform conditions for implementing binding EU law
Authorised institution	Commission only	Commission, or Council in specific Treaty-defined circumstances
Enabling act	Legislative act	Legally binding Union act
Scope	Non-essential elements of the legislative act	Practical and uniform implementation
General or individual application	General application	General or individual application
Amendment of basic act	May amend non-essential elements	Cannot amend the basic act
Member State involvement	Expert consultation arrangements	Comitology committees under Regulation 182/2011, where applicable
Parliamentary control	Objection and revocation	Control under the implementing-act framework; no equivalent Article 290 objection mechanism
Essential elements	Cannot be delegated	Cannot be altered through implementing powers

The distinction is not simply between “technical” and “administrative” matters. Both categories may involve technically complex regulation.

The decisive question is the legal function of the proposed act.

If the measure supplements or amends non-essential elements of a legislative act, Article 290 is the relevant framework.

If the measure establishes uniform conditions for implementing an existing binding act without changing its substance, Article 291 is the relevant framework.

7. The Court of Justice: Defining the Boundaries Between Articles 290 and 291

7.1. Commission v Parliament and Council: The Biocidal Products case

A particularly important judgment is Commission v Parliament and Council (Case C-427/12), concerning the regulation of biocidal products and fees payable to the European Chemicals Agency.

The dispute concerned whether the Commission should have been empowered to adopt an implementing act or a delegated act.

The Court examined the distinction between Articles 290 and 291 and explained that the two provisions concern different forms of authority.

Under Article 290, the Commission adopts rules supplementing or amending non-essential elements of the legislative act.

Under Article 291, the Commission establishes uniform conditions for implementing legally binding acts.

The Court recognised that the EU legislature enjoys a degree of discretion when determining whether to confer delegated or implementing powers. That discretion is nevertheless subject to judicial review.

The legislature cannot disregard the constitutional distinction between the two categories.

The judgment is important because it confirms that the classification of an act must be assessed in relation to its function and the authority being conferred, rather than simply the administrative convenience of the institution.

7.2. Parliament v Commission: Limits on implementing powers

In Parliament v Commission (Case C-65/13), the Court considered the limits of the Commission’s authority to adopt implementing measures.

The case concerned the implementation of EU rules relating to the common agricultural policy and the use of delegated and implementing powers.

The Court examined the relationship between the basic legislation and the Commission’s authority to adopt additional measures.

The judgment reinforces the principle that implementing powers must remain within the framework established by the legislative act.

The Commission cannot use implementing measures to alter the substance of the basic legislation or assume authority that the legislature has not conferred.

7.3. Parliament v Council: Essential elements and legislative responsibility

In Parliament v Council (Case C-355/10), the Court examined the limits of implementing powers in the context of surveillance of external sea borders.

The judgment is significant for the constitutional principle that essential elements requiring political choices must be determined by the legislature.

The Commission cannot be authorised to make decisions that belong to the legislative process simply because those decisions are presented as operational or technical details.

The case illustrates that the distinction between essential and non-essential elements is a substantive constitutional question.

It must be assessed by examining the nature of the powers exercised and the importance of the decisions involved.

7.4. The legislature’s discretion and judicial review

The Court has recognised that the legislature has discretion when deciding whether to confer delegated or implementing powers.

However, that discretion does not permit arbitrary classification.

The Court may review whether the institution has respected the requirements of Articles 290 and 291, whether the correct legal framework was selected, and whether the Commission has remained within the limits of its authority.

This review protects the constitutional allocation of responsibilities between the legislature and the executive.

It also ensures that the distinction between supplementing legislation and implementing it remains legally meaningful.

8. Regulatory Examples in Practice

8.1. Food safety and labelling

EU food legislation often establishes general safety and consumer information requirements.

However, scientific and technical developments may require the updating of specific classifications, lists, or technical standards.

Where the basic legislative act authorises the Commission to supplement or amend non-essential elements, a delegated act may be used.

Where uniform administrative conditions are needed to apply the legislation across Member States, an implementing act may be appropriate.

The same regulatory framework may therefore rely on both categories.

The legal classification depends on whether the Commission is changing or supplementing the regulatory framework, or merely establishing uniform conditions for applying it.

8.2. Agricultural policy

Agricultural legislation frequently requires detailed administrative arrangements, common market standards, reporting systems, and uniform procedures.

Implementing acts may establish common procedures for the administration of agricultural measures across Member States.

Delegated acts may be used where the basic legislation authorises the Commission to supplement or amend non-essential elements, including certain technical requirements.

The distinction allows the Union to combine a common legislative framework with detailed rules that can respond to changing agricultural and market conditions.

8.3. Medicinal products and public health

The regulation of medicinal products involves complex scientific and administrative processes.

EU legislation may establish the legal requirements for authorisation, safety, and supervision while leaving certain procedural and technical matters to additional acts.

Implementing acts may be used where uniform conditions are necessary for the application of the underlying legislation.

Delegated acts may be used where the legislative act permits the Commission to supplement or amend non-essential elements.

The system seeks to ensure that technical developments can be accommodated without transferring the fundamental regulatory choices away from the legislature.

8.4. Environmental regulation

Environmental legislation often contains technical annexes, reporting obligations, measurement requirements, and scientific classifications.

A legislative act may establish the environmental objectives and the essential obligations of Member States or regulated actors.

Delegated acts may update certain non-essential technical elements where expressly authorised.

Implementing acts may establish common formats, reporting procedures, or other uniform conditions necessary for consistent application.

The distinction is particularly relevant in environmental regulation because scientific developments may require regular technical adjustments while the fundamental level of protection remains a matter for the legislature.

8.5. Financial regulation

EU financial legislation often relies on detailed technical standards and uniform supervisory arrangements.

The relevant legislative framework may authorise the Commission to adopt delegated acts or implementing acts, sometimes following technical work by European supervisory authorities.

The exact allocation of responsibilities depends on the applicable legislation.

The use of these instruments is intended to improve consistency across national financial markets while preserving the legislative framework established by the Parliament and Council.

The Commission must nevertheless act within the authority conferred by the basic act and respect the applicable procedural requirements.

9. Legal Hierarchy and Relationship with Other EU Acts

Delegated and implementing acts occupy a particular position within the hierarchy of EU law.

At the highest level are the Treaties, the Charter of Fundamental Rights, and the general principles of EU law.

International agreements concluded by the Union occupy a distinct position within the EU legal order and must be respected by secondary legislation.

Secondary law includes legislative acts and non-legislative acts adopted by the EU institutions.

Legislative acts adopted through the ordinary or special legislative procedures provide the framework within which delegated and implementing powers may be exercised.

Delegated and implementing acts are binding, but they remain subordinate to the basic act and the Treaties.

A delegated act cannot exceed the delegation or amend essential elements of the legislative framework.

An implementing act cannot alter the basic act or introduce obligations beyond the authority conferred by it.

Neither category may lawfully contradict higher-ranking EU law.

It is important, however, not to assume that delegated acts and implementing acts form two separate levels in a simple hierarchy in which one is generally superior to the other. They are distinct forms of non-legislative authority, each subject to its own Treaty conditions and to the legal act from which its powers derive.

Their relationship is primarily functional and constitutional rather than a general ranking between the two categories.

10. Judicial Review and Accountability

10.1. Review under Article 263 TFEU

Delegated and implementing acts may be subject to judicial review under Article 263 TFEU.

The Court of Justice may examine whether the Commission acted within the powers conferred by the Treaties and the relevant basic act.

Potential grounds of review include:

• Lack of competence.
• Infringement of an essential procedural requirement.
• Infringement of the Treaties or any rule of law relating to their application.
• Misuse of powers.
• Infringement of the limits of the delegation.
• Failure to comply with the applicable comitology procedure.
• Breach of proportionality, legal certainty, or fundamental rights.

The legal standing requirements differ according to the applicant.

EU institutions and Member States have privileged standing under Article 263. Natural and legal persons must satisfy the relevant conditions for challenging an act.

10.2. Review of delegated acts

A delegated act may be challenged where the Commission has exceeded the authority conferred by the legislative act.

For example, if the Commission amends an essential element of the basic legislation through a delegated regulation, the act may be unlawful.

Similarly, a delegated act may be challenged where the Commission has exceeded the objectives, scope, or content of the delegation.

The Parliament and Council also retain their political and institutional control mechanisms under Article 290.

Judicial review and legislative objection are distinct safeguards. The first examines legality; the second allows the co-legislators to prevent a delegated act from entering into force under the conditions established by the basic act.

10.3. Review of implementing acts

Implementing acts may be challenged where they exceed the powers conferred by the basic act or fail to comply with Article 291 and the applicable procedural framework.

For example, an implementing regulation that introduces new substantive obligations rather than establishing uniform conditions for implementation may be open to challenge.

A failure to comply with the applicable comitology procedure may also affect the legality of the measure.

The Court may examine whether the Commission has remained within the limits of the implementing power and respected the principles governing the exercise of EU authority.

10.4. Preliminary rulings and national courts

National courts may also become involved where the validity or interpretation of a delegated or implementing act arises in domestic proceedings.

Under Article 267 TFEU, national courts may refer questions concerning the interpretation of EU law or the validity of acts adopted by EU institutions to the Court of Justice.

A national court cannot itself declare an EU act invalid. Where it considers that a challenge to the validity of an EU act may be well founded, it must refer the matter to the Court of Justice in accordance with the principles established in Foto-Frost (Case 314/85).

This mechanism ensures the uniform assessment of the validity of EU acts throughout the Union.

10.5. Accountability and institutional balance

The system of delegated and implementing powers involves more than judicial supervision.

The Parliament and Council exercise control over delegated acts through objection and revocation.

Member States participate in the control of implementing powers through comitology.

The Commission remains accountable for exercising its powers within the legal framework established by the Treaties and the basic act.

These safeguards are designed to prevent regulatory authority from becoming detached from the institutions responsible for adopting the underlying legislation.

11. Practical Method for Identifying the Correct Type of Act

When examining a delegated or implementing measure, the following questions provide a useful analytical framework.

First, identify the basic legal act. Determine which regulation, directive, or other legally binding Union act provides the authority for the measure.

Second, identify the Treaty basis. Establish whether the power is based on Article 290 or Article 291 TFEU.

Third, examine the function of the measure. Is it intended to supplement or amend non-essential elements of a legislative act, or to establish uniform conditions for implementing existing law?

Fourth, identify the scope of the authority. Determine whether the Commission has remained within the objectives, content, scope, and duration of the delegation or the implementing power.

Fifth, examine the applicable procedure. For delegated acts, consider expert consultation, the objection period, and the possibility of revocation. For implementing acts, identify whether the advisory or examination procedure applies and whether the relevant committee requirements were satisfied.

Sixth, examine the legal effects. Determine whether the measure is of general or individual application and identify the persons or authorities affected.

Seventh, consider judicial review. Assess whether the act complies with the Treaties, the basic legal act, procedural requirements, and general principles of EU law.

This method is useful for lawyers, public authorities, businesses, and researchers because it identifies not only what the measure requires but also whether the institution adopting it had the authority to do so.

12. Key Takeaways

• Articles 290 and 291 TFEU establish two distinct forms of non-legislative regulatory authority.
• Delegated acts supplement or amend certain non-essential elements of a legislative act.
• Implementing acts establish uniform conditions for implementing legally binding EU acts.
• Only the Commission may adopt delegated acts under Article 290.
• Implementing powers are generally conferred on the Commission, although the Council may act in specific Treaty-defined circumstances.
• Essential elements of a legislative framework must remain within the responsibility of the EU legislature.
• A legislative act delegating power must define the objectives, content, scope, and duration of the delegation.
• The European Parliament or Council may revoke delegated powers or object to an individual delegated act.
• Delegated acts are generally prepared following consultation with experts designated by Member States, but this is not the comitology procedure.
• Member States have primary responsibility for implementing legally binding EU acts under Article 291(1).
• Where uniform conditions are necessary, implementing powers may be conferred on the Commission or, in specific circumstances, the Council.
• Regulation (EU) No 182/2011 establishes the principal framework for comitology.
• The advisory and examination procedures provide different forms of Member State control over implementing acts.
• Implementing acts cannot amend the substance of the basic legal act.
• Delegated and implementing acts are binding but are not legislative acts within the meaning of Article 289(3).
• Both categories are subject to judicial review and must comply with the Treaties, the basic act, and general principles of EU law.
• The distinction between Articles 290 and 291 depends on the legal function of the measure, not merely its technical complexity or title.

13. Frequently Asked Questions

1. What is a delegated act under EU law?

A delegated act is a non-legislative act of general application adopted by the European Commission under Article 290 TFEU. It supplements or amends certain non-essential elements of a legislative act, within the objectives, content, scope, and duration of the delegation established by the legislature.

2. What is an implementing act?

An implementing act is a binding non-legislative measure adopted to establish uniform conditions for implementing legally binding EU acts. Its principal purpose is to ensure that EU legislation is applied consistently throughout the Member States.

3. What is the main difference between delegated and implementing acts?

Delegated acts may supplement or amend non-essential elements of a legislative act. Implementing acts establish uniform conditions for applying existing law and cannot amend the basic act. The distinction is based on their legal function and the authority conferred by the relevant legislation.

4. Can the European Commission adopt delegated acts without authorisation?

No. The Commission must receive an express delegation in a legislative act. The basic act must define the objectives, content, scope, and duration of the delegation and establish the conditions governing its exercise.

5. Can the Commission amend EU legislation through a delegated act?

Yes, but only within the limits of Article 290 TFEU. The Commission may amend non-essential elements of the legislative act where the legislature has expressly authorised it to do so. Essential elements cannot be delegated.

6. Can an implementing act change the underlying EU regulation?

No. An implementing act cannot amend the substance of the basic legal act. It may establish detailed and uniform conditions necessary for applying the legislation, but it cannot introduce new substantive rules beyond the authority conferred by the underlying act.

7. What is comitology?

Comitology is the system through which committees composed of representatives of Member States assist the Commission in exercising implementing powers. It is governed principally by Regulation (EU) No 182/2011 and provides mechanisms for national government control of implementing measures.

8. What is the difference between the advisory and examination procedures?

Under the advisory procedure, the committee gives an opinion that the Commission must take the utmost account of, but the opinion does not ordinarily prevent adoption. Under the examination procedure, a positive opinion generally requires adoption, while a negative opinion prevents the Commission from adopting the draft under that procedure.

9. Can the European Parliament block a delegated act?

Yes. Where the basic act provides for the objection mechanism under Article 290, the Parliament may object within the prescribed period. If it does so, the delegated act does not enter into force. The Council has an equivalent right to object.

10. Can the European Parliament block an implementing act?

The Parliament does not have the same individual objection mechanism under Article 290 because that mechanism applies to delegated acts. Implementing acts are subject to the control framework established by Article 291 and Regulation 182/2011, in which Member State representatives participate through comitology.

11. Can the Commission adopt an implementing act without a committee?

Yes, in certain circumstances. Comitology is not compulsory for every implementing act. The applicable legal framework determines whether a committee must be consulted or whether the Commission may adopt the measure without that procedure.

12. Are delegated and implementing acts legislative acts?

No. They are non-legislative acts adopted under Articles 290 and 291 TFEU. They may take the form of regulations, directives, or decisions, but they are not adopted through the ordinary or special legislative procedure.

13. Can delegated and implementing acts be challenged before the Court of Justice?

Yes. They may be subject to judicial review under Article 263 TFEU. The Court may examine whether the Commission exceeded its powers, breached procedural requirements, infringed the Treaties, or violated general principles of EU law.

14. Why are delegated and implementing acts important for businesses?

They frequently contain detailed technical, administrative, and regulatory requirements that determine how EU legislation operates in practice. Businesses may need to comply with requirements established through these acts even though the underlying legislative framework was adopted earlier by the Parliament and Council.

14. Conclusion

Delegated and implementing acts are essential components of the European Union’s regulatory system. They allow the Union to maintain a common legal framework while responding to technical developments, scientific advances, administrative requirements, and the practical needs of uniform application.

Their constitutional legitimacy depends on maintaining a clear distinction between legislative authority and the exercise of powers conferred on the executive institutions.

Article 290 TFEU permits the Commission to supplement or amend non-essential elements of legislative acts, subject to clearly defined limits and the control of the European Parliament and Council. Article 291 TFEU provides a mechanism for establishing uniform conditions of implementation, while preserving the primary responsibility of Member States and allowing national governments to supervise the Commission through comitology.

Neither mechanism permits the Commission to assume unlimited regulatory authority. Essential policy choices remain within the responsibility of the legislature, and every delegated or implementing measure must comply with the Treaties and the legal act from which its authority derives.

The distinction is therefore more than a technical classification. It protects the institutional balance of the Union, preserves the democratic legitimacy of EU legislation, and ensures that regulatory flexibility does not undermine the constitutional limits governing the exercise of public power.

For anyone studying EU law, understanding Articles 290 and 291 is indispensable. These provisions explain how the Union moves from legislative principles to detailed regulatory requirements, and how it seeks to reconcile uniformity, administrative efficiency, democratic accountability, and the rule of law.

15. Primary Legal Sources and Further Reading

Treaties and legislation

1. Article 289 TFEU – Legislative Acts and Legislative Procedures
2. Article 290 TFEU – Delegated Acts
3. Article 291 TFEU – Implementing Acts
4. Article 263 TFEU – Actions for Annulment
5. Article 267 TFEU – Preliminary Rulings
6. Regulation (EU) No 182/2011 – Rules and General Principles Concerning Implementing Powers
7. Interinstitutional Agreement on Better Law-Making

Court of Justice case law

1. Commission v Parliament and Council, Case C-427/12 – Distinction between delegated and implementing powers under Articles 290 and 291 TFEU.
2. Parliament v Council, Case C-355/10 – Essential elements and the limits of implementing powers.
3. Parliament v Commission, Case C-65/13 – Institutional powers and the limits of Commission implementation.
4. Foto-Frost v Hauptzollamt Lübeck-Ost, Case 314/85 – Exclusive jurisdiction of the Court of Justice to declare EU acts invalid.

Institutional resources

1. European Commission – Implementing and Delegated Acts
2. European Commission – Comitology
3. Council of the European Union – Implementing and Delegated Acts
4. European Parliament Research Service – Understanding Delegated and Implementing Acts
5. EUR-Lex – The European Union’s Secondary Law
6. EUR-Lex – Hierarchy of EU Norms