Mutual Recognition and Harmonisation of National Laws Within the Internal Market

Mutual Recognition and Harmonisation of National Laws Within the Internal Market

1. Introduction

The European Union’s internal market is founded on the principle that economic activity should be able to cross national borders without encountering unjustified legal or administrative obstacles. Its establishment, however, presents a fundamental constitutional and regulatory challenge: the Member States retain their own legal systems, regulatory institutions and public policy priorities, yet their national rules must operate within a common economic area.

A product lawfully manufactured and marketed in one Member State should not ordinarily be excluded from another Member State merely because the latter applies different technical requirements. A business established in one country should not face unnecessary duplication of regulatory procedures when expanding into another. At the same time, national authorities must retain the ability to protect legitimate interests such as public health, consumer safety, environmental protection and public security.

European Union law addresses this challenge through two closely connected mechanisms: mutual recognition and harmonisation.

Mutual recognition requires Member States, in defined circumstances, to accept goods, qualifications, services or regulatory outcomes recognised in another Member State, even where national rules are not identical. It is particularly important where the Union has not adopted comprehensive common legislation.

Harmonisation, by contrast, involves the adoption of common EU rules that approximate or, in some circumstances, substantially unify national legislation. It reduces regulatory differences by establishing common standards, requirements or procedures.

These mechanisms are complementary rather than competing. Mutual recognition permits market integration without requiring complete legislative uniformity. Harmonisation becomes necessary where divergent national requirements create substantial barriers, where consistent protection is required throughout the Union, or where mutual recognition alone cannot provide sufficient legal certainty.

Their relationship is central to the interpretation of the free movement provisions, particularly Articles 34–36 TFEU, and to the Union’s legislative competence under Articles 114 and 115 TFEU.

2. The Constitutional Foundations of Market Integration

The internal market is defined by Article 26(2) TFEU as an area without internal frontiers in which the free movement of goods, persons, services and capital is ensured in accordance with the Treaties.

This objective does not require every Member State to adopt identical legislation. The Treaties instead establish a combination of negative and positive integration.

Negative integration occurs through Treaty provisions that prohibit national measures obstructing cross-border economic activity. The free movement provisions are its principal instruments. They can prevent Member States from maintaining national rules that unjustifiably restrict trade, even where no common EU legislation has been adopted.

Positive integration occurs through EU legislation that establishes common requirements or approximates national rules. Harmonisation is the principal legislative technique through which the Union develops this form of integration.

The distinction is important. A national measure may be incompatible with Article 34 TFEU even if the Union has never adopted harmonising legislation in the relevant field. Conversely, where EU harmonisation legislation exists, the legal assessment may be governed primarily by the harmonised framework rather than by the unrestricted application of national regulatory standards.

Article 4(2)(a) TFEU identifies the internal market as an area of shared competence. Both the Union and Member States therefore possess legislative and regulatory responsibilities, subject to the Treaties and the extent to which the Union has exercised its competence.

Article 5 TEU also requires the Union to respect subsidiarity and proportionality when exercising non-exclusive competences. Harmonisation must consequently have a valid Treaty basis and remain within the limits of the powers conferred upon the Union.

The internal market is therefore not a general authorisation for the Union to regulate every aspect of national economic and social life. Its legislative powers must be connected to the objectives and legal bases established by the Treaties.

3. The Principle of Mutual Recognition

Mutual recognition is one of the most influential principles developed by the Court of Justice in the construction of the internal market.

Its central idea is straightforward: where a product is lawfully manufactured and marketed in one Member State, another Member State should ordinarily permit its sale without requiring it to satisfy every additional national technical requirement.

The principle recognises that different regulatory systems can pursue comparable legitimate objectives. A Member State may regulate product composition, labelling, packaging, dimensions or safety, but the existence of a different national standard does not automatically justify excluding goods originating elsewhere in the Union.

Mutual recognition prevents national regulatory diversity from becoming an instrument of economic protectionism.

It is particularly relevant where products are not, or are only partially, covered by harmonised EU legislation. In those circumstances, national rules continue to exist, but their application must respect the free movement obligations established by the Treaties.

Mutual recognition does not mean that the Member State of destination must accept every product regardless of its characteristics or risks. The principle operates subject to legitimate public-interest justifications and proportionality.

It is therefore better understood as a presumption in favour of market access, rather than as an unconditional obligation to accept all foreign products.

4. Cassis de Dijon: The Judicial Origin of Mutual Recognition

The modern principle of mutual recognition is closely associated with the landmark judgment in Rewe-Zentral AG v Bundesmonopolverwaltung für Branntwein, Case 120/78, commonly known as Cassis de Dijon.

The dispute concerned a French fruit liqueur containing a relatively low alcohol percentage. German legislation imposed a minimum alcohol content for certain fruit liqueurs, and the German authorities refused to permit the product’s importation because it did not satisfy that requirement.

The Court of Justice held that, in the absence of harmonisation, obstacles to trade resulting from differences between national legislation must be accepted only insofar as the relevant national requirements can be justified by legitimate public interests.

The judgment established two particularly important propositions.

First, products lawfully produced and marketed in one Member State should, in principle, have access to the markets of other Member States.

Second, national requirements that apply without distinction to domestic and imported products may nevertheless constitute measures having an equivalent effect to quantitative restrictions under Article 34 TFEU.

This second proposition significantly expanded the practical scope of the free movement of goods. A national rule does not escape scrutiny merely because it does not discriminate expressly against imported goods.

4.1 Mandatory requirements

In Cassis de Dijon, the Court recognised that certain overriding requirements of public interest may justify national restrictions even where they are not expressly listed in Article 36 TFEU.

The original categories included:

• Effectiveness of fiscal supervision.
• Protection of public health.
• Fairness of commercial transactions.
• Protection of consumers.

The Court’s subsequent case law developed additional mandatory requirements, including environmental protection, road safety, protection of workers and other legitimate public interests.

These grounds are generally associated with measures that apply without distinction to domestic and imported products. Where a measure is directly discriminatory, the Member State will ordinarily need to rely on an express Treaty derogation, particularly Article 36 TFEU, rather than simply invoke the broader category of mandatory requirements.

A national measure must also satisfy proportionality. It must be suitable for achieving the legitimate objective and must not impose restrictions exceeding what is necessary.

4.2 The importance of the judgment

Cassis de Dijon transformed the legal relationship between national regulatory autonomy and European market integration.

Before the judgment, the removal of customs duties and quantitative restrictions might have appeared sufficient to establish a functioning common market. The Court recognised that regulatory differences could produce equivalent obstacles even where traditional trade barriers had disappeared.

Mutual recognition therefore became a judicial instrument for addressing non-tariff barriers without requiring the Union to legislate comprehensively in every regulated field.

The judgment remains a constitutional foundation of the internal market and continues to influence the interpretation of Articles 34–36 TFEU.

5. Mutual Recognition and Measures Having Equivalent Effect

The principle of mutual recognition must be understood in conjunction with Article 34 TFEU, which prohibits quantitative restrictions on imports and all measures having equivalent effect between Member States.

In Commission v Germany, Case 178/84, concerning the German beer purity requirements, the Court considered national rules that prevented the marketing of certain beers lawfully produced in other Member States because they did not comply with domestic requirements concerning ingredients.

The Court rejected the proposition that a Member State could automatically exclude products because they differed from its domestic regulatory model. Consumer protection and public health could be legitimate objectives, but the national authorities had to demonstrate that the restrictions were justified and proportionate.

The judgment reinforced the principle that regulatory diversity cannot, by itself, justify market exclusion.

The Court subsequently refined its approach in Keck and Mithouard, Joined Cases C-267/91 and C-268/91.

The dispute concerned national rules prohibiting resale at a loss. The Court distinguished between product requirements and certain selling arrangements.

Selling arrangements fall outside Article 34 TFEU where they apply to all relevant traders operating within the national territory and affect, in the same manner in law and in fact, the marketing of domestic and imported products.

This distinction prevents Article 34 from becoming a general instrument for reviewing every national rule affecting commercial activity.

However, Keck did not abolish mutual recognition or the prohibition of discriminatory and disproportionate national requirements. Product composition, packaging, labelling and similar requirements remain subject to the principles developed in Cassis de Dijon.

The Court’s subsequent case law has also examined restrictions on market access more broadly, including measures affecting the practical ability of imported goods to enter a national market.

6. Mutual Recognition Beyond Goods

Although Cassis de Dijon is principally associated with the free movement of goods, mutual recognition has a wider role in the internal market.

6.1 Professional qualifications

The recognition of professional qualifications enables individuals who have obtained qualifications in one Member State to pursue regulated professions in another, subject to the applicable EU framework.

Directive 2005/36/EC on the recognition of professional qualifications establishes mechanisms for recognising qualifications across Member States.

It provides for automatic recognition in certain sectors, including specified medical, dental, nursing, veterinary, pharmaceutical and architectural professions, where harmonised minimum training requirements are satisfied.

For other regulated professions, the general system of recognition applies. The host Member State may examine the applicant’s qualifications and, where substantial differences exist, may impose proportionate compensation measures, such as an adaptation period or aptitude test, subject to the Directive.

The principle does not require every national qualification to be treated as identical. It establishes a legal framework through which differences can be assessed without unjustifiably preventing professional mobility.

6.2 Services

Mutual recognition also influences the provision of cross-border services.

A service provider lawfully established in one Member State may seek to provide services in another without necessarily establishing a permanent presence there.

However, the legal position is more complex than in the field of goods. Services are frequently subject to professional, administrative, financial and public-interest regulation in the host Member State.

The Court has therefore developed a case-by-case approach under Article 56 TFEU, requiring national restrictions to be justified by legitimate public-interest objectives and to satisfy proportionality.

Directive 2006/123/EC on services in the internal market establishes a broader framework for removing unjustified barriers, simplifying administrative procedures and facilitating cross-border service provision.

It does not establish unconditional recognition of every authorisation or regulatory decision issued by another Member State.

6.3 Company establishment and corporate recognition

The recognition of companies established under the law of another Member State is also important to market integration.

Articles 49 and 54 TFEU protect freedom of establishment for companies and firms satisfying the Treaty conditions.

The Court’s case law, including Centros, Case C-212/97, Überseering, Case C-208/00, and Inspire Art, Case C-167/01, has restricted the ability of Member States to deny recognition to companies validly incorporated under the law of another Member State merely because their principal economic activity takes place elsewhere.

This does not eliminate national company-law systems or prevent Member States from adopting legitimate anti-fraud and creditor-protection measures. It does, however, restrict the use of national rules to obstruct the exercise of freedom of establishment.

Mutual recognition in this context is therefore connected to the broader constitutional principle that companies must be able to exercise Treaty rights across national borders.

7. Regulation (EU) 2019/515: Mutual Recognition of Goods in Practice

The EU legislature adopted Regulation (EU) 2019/515 on the mutual recognition of goods lawfully marketed in another Member State to strengthen the practical application of the principle.

The Regulation replaced Regulation (EC) No 764/2008 and has applied since 19 April 2020.

Its purpose is to make mutual recognition more predictable for businesses and national authorities by establishing procedural safeguards and clearer obligations.

7.1 Scope of the Regulation

The Regulation applies to goods, including agricultural products, that are lawfully marketed in another Member State and are subject to national technical rules in the destination Member State.

A national technical rule may concern characteristics such as:

• Composition and quality.
• Dimensions and weight.
• Product designation and terminology.
• Packaging and presentation.
• Labelling and symbols.
• Testing methods and conformity assessment.
• Certain conditions of use, recycling, reuse or disposal.

The Regulation is particularly relevant where the product or the relevant aspect of the product is not fully covered by EU harmonisation legislation.

Goods are considered lawfully marketed in another Member State where they comply with the relevant rules applicable there, or are not subject to such rules, and are made available to end users in that Member State.

The fact that a product has merely been manufactured in another Member State is not, by itself, sufficient to establish that it qualifies for mutual recognition.

7.2 The mutual recognition declaration

Article 4 allows producers, authorised representatives, importers or distributors, in the circumstances specified by the Regulation, to prepare a voluntary mutual recognition declaration.

The declaration provides information demonstrating that the goods are lawfully marketed in another Member State.

It is intended to reduce uncertainty and administrative burdens by giving national authorities a structured means of assessing the product’s legal status.

The declaration is voluntary. Its absence does not automatically prevent an economic operator from relying on mutual recognition. The competent authority may request other information necessary to establish lawful marketing, subject to the procedural and proportionality requirements of the Regulation.

7.3 Assessment by the destination Member State

Article 5 establishes a procedure for competent authorities that intend to assess goods under the mutual recognition principle.

The authority must contact the economic operator and identify the goods concerned, the applicable national technical rule and the reasons for the assessment.

The economic operator must be given an opportunity to submit information and observations. The Regulation also provides for the use of a mutual recognition declaration and supporting evidence.

Importantly, an operator may generally continue making the goods available on the market while the assessment is being carried out, unless the authority adopts a decision restricting or denying market access or a permitted temporary suspension applies.

This procedural protection prevents administrative assessment from automatically becoming an indefinite prohibition on commercial activity.

7.4 Restrictions and administrative decisions

Where a Member State decides to restrict or deny market access, its decision must comply with the Regulation and the Treaty principles.

The authority must identify the relevant national technical rule and explain the legitimate public-interest objective pursued. It must also demonstrate why the restriction is appropriate and proportionate.

The mere fact that goods do not comply with the destination Member State’s domestic technical requirements is not sufficient justification.

The Regulation also strengthens administrative cooperation, provides for Product Contact Points and establishes a problem-solving mechanism connected with SOLVIT.

These mechanisms are intended to help economic operators challenge unjustified administrative barriers without immediately resorting to lengthy national litigation.

8. Harmonisation: The Legislative Method of Market Integration

Mutual recognition does not resolve every problem created by regulatory differences.

Where national standards differ substantially, where risks require consistent protection, or where the market cannot function effectively through recognition alone, the Union may adopt harmonisation legislation.

Harmonisation means the approximation of national laws, regulations or administrative provisions through EU legal acts.

The principal legal basis is Article 114 TFEU.

Under Article 114(1), the European Parliament and the Council may adopt measures for the approximation of national provisions that have as their object the establishment and functioning of the internal market.

The provision generally operates through the ordinary legislative procedure, allowing the European Parliament and the Council to participate as co-legislators.

Harmonisation may take different forms. It may establish minimum standards, introduce uniform rules, coordinate national procedures or replace divergent national requirements in a particular field.

The choice depends on the legislative objective, the nature of the regulated activity and the degree of regulatory uniformity required.

9. Article 114 TFEU and the Limits of Harmonisation

Article 114 is a central legislative foundation of the internal market, but it does not confer unlimited regulatory authority.

The Union must demonstrate that the measure genuinely contributes to improving the conditions for establishing or operating the internal market.

9.1 The relationship with internal market objectives

In Germany v Parliament and Council, Case C-376/98, commonly known as the Tobacco Advertising case, the Court examined the validity of a directive prohibiting most forms of tobacco advertising and sponsorship.

The Court held that Article 114 could not be used as a general legal basis for regulating matters unrelated to the establishment and functioning of the internal market.

The existence of differences between national legislation is not, by itself, sufficient. The measure must genuinely address obstacles to trade or appreciable distortions of competition, or prevent their likely emergence.

The judgment established an important constitutional limit: harmonisation cannot be justified merely by describing a policy objective as beneficial to the internal market.

The Court later clarified the approach in British American Tobacco, Case C-491/01, and subsequent cases, recognising that Article 114 may support measures designed to remove existing obstacles or prevent likely future obstacles where divergent national legislation would otherwise impede market integration.

9.2 Exclusions from Article 114(1)

Article 114(2) expressly excludes certain areas from the general legal basis:

• Fiscal provisions.
• Provisions relating to the free movement of persons.
• Provisions relating to the rights and interests of employed persons.

These exclusions do not mean that the Union cannot legislate in those areas. They mean that the appropriate Treaty legal bases and legislative procedures must be used.

For example, certain tax harmonisation measures are governed by Article 113 TFEU, while aspects of social policy and workers’ rights are addressed through other Treaty provisions.

The legal basis of an EU act must therefore be determined by its objective and content rather than simply by the fact that it may have economic consequences.

9.3 High levels of protection

Article 114(3) requires the Commission, when proposing measures concerning health, safety, environmental protection and consumer protection, to take a high level of protection as a basis, taking account in particular of new developments based on scientific facts.

This provision demonstrates that market integration is not intended to produce a downward competition in regulatory standards.

Harmonisation may instead establish common protection at a relatively high level, ensuring that the removal of internal barriers does not undermine legitimate public interests.

10. Minimum and Maximum Harmonisation

Not all harmonisation measures have the same effect on national legislative autonomy.

An important distinction exists between minimum and maximum harmonisation.

10.1 Minimum harmonisation

Minimum harmonisation establishes a common regulatory floor.

Member States must meet the minimum requirements imposed by EU legislation but may retain or introduce more protective national standards where the relevant instrument permits them and the additional requirements remain compatible with EU law.

This approach allows national authorities to maintain higher levels of protection in areas such as consumer rights, environmental protection or certain aspects of social policy.

However, the freedom to adopt stricter rules is not unlimited. A Member State must examine the specific provisions of the harmonisation instrument, including any conditions governing national derogations or additional protection.

10.2 Maximum harmonisation

Maximum harmonisation, sometimes called full harmonisation, seeks to establish uniform requirements throughout the Union.

Where an instrument provides for maximum harmonisation, Member States generally cannot introduce national rules that depart from the common framework, whether by imposing lower or higher standards, unless the legislation expressly permits derogations.

The purpose is to prevent regulatory fragmentation and ensure that businesses and consumers operate under a consistent set of requirements.

Consumer law provides examples of both approaches. Some EU consumer directives have historically allowed Member States to maintain more protective national provisions, while others have adopted more extensive full-harmonisation models.

10.3 Why the distinction matters

The difference between minimum and maximum harmonisation determines the extent to which national authorities retain regulatory discretion.

It also affects the legal assessment of national legislation. A stricter national consumer-protection rule may be permissible under a minimum-harmonisation directive but incompatible with a maximum-harmonisation instrument.

Consequently, the legal consequences cannot be determined merely by identifying the existence of an EU directive. Its specific provisions and harmonisation method must be examined.

11. Harmonisation Through Regulations and Directives

Article 114 does not prescribe one exclusive form of legislative instrument.

The Union may use regulations or directives, depending on the objective and the desired degree of uniformity.

A regulation is directly applicable throughout the Member States under Article 288 TFEU. It does not require national transposition, although national authorities may need to adopt administrative or procedural measures to ensure its effective operation.

A directive binds Member States as to the result to be achieved while leaving national authorities the choice of form and methods. It therefore allows national legal systems to implement common EU requirements through their own legislative structures.

The choice between the two instruments has practical consequences.

A regulation may be appropriate where uniform rules are necessary and direct application is desirable. A directive may be preferable where the Union wishes to establish common obligations while allowing national legal systems to determine how those obligations are incorporated into domestic law.

Neither instrument is inherently superior in every harmonisation context. The appropriate form depends on the legislative objective and the structure of the relevant regulatory field.

12. Safeguard Clauses and National Derogations

Harmonisation does not necessarily eliminate every possibility of national regulatory variation.

Article 114 contains mechanisms allowing Member States to maintain or introduce certain national provisions under defined circumstances.

Article 114(4) permits a Member State, after the adoption of a harmonisation measure, to maintain existing national provisions justified by major needs referred to in Article 36 TFEU or relating to the protection of the environment or working environment.

The Member State must notify the Commission of those provisions and the reasons for maintaining them.

Article 114(5) addresses a different situation. It allows a Member State to introduce new national provisions based on new scientific evidence relating to environmental or working-environment protection where a problem specific to that Member State arises after the adoption of the harmonisation measure.

The conditions are deliberately strict. The Member State must demonstrate that the proposed provisions are necessary to address the specific problem and satisfy the requirements established by the Treaty.

Article 114(6) requires the Commission to approve or reject the notified national provisions within the prescribed period, subject to the Treaty conditions and the possibility of extending the examination where justified.

Articles 114(7) and 114(8) address relevant developments and urgent public-health concerns. Article 114(9) provides a specific judicial route where the Commission or a Member State considers that another Member State is improperly using the derogation powers under the provision.

Article 114(10) also permits harmonisation measures to include safeguard clauses allowing provisional national measures for non-economic reasons referred to in Article 36, subject to Union control.

These provisions reflect a balance between uniformity and national regulatory responsibility. They prevent harmonisation from becoming an absolute prohibition on legitimate national action while ensuring that derogations cannot be used as disguised trade barriers.

13. Article 115 TFEU and Other Harmonisation Mechanisms

Article 115 TFEU provides an additional legal basis for the approximation of national laws.

Under this provision, the Council, acting unanimously under a special legislative procedure and after consulting the European Parliament and the Economic and Social Committee, may issue directives approximating national laws, regulations or administrative provisions that directly affect the establishment or functioning of the internal market.

Article 115 is particularly relevant where Article 114 is unavailable or where a specific Treaty framework requires a different legislative procedure.

Other Treaty provisions also provide sector-specific harmonisation powers. The Union may therefore regulate aspects of transport, consumer protection, environmental policy, public health and social policy through their respective legal bases.

Article 116 TFEU provides a further mechanism for addressing distortions of competition resulting from differences between national laws. Where the Commission finds that such differences distort competition in the internal market, it must consult the Member States concerned. If consultation fails to resolve the problem, the European Parliament and the Council may adopt the necessary directives through the ordinary legislative procedure.

Article 117 TFEU complements this mechanism by providing for consultation where a Member State anticipates that a proposed legislative or regulatory change may create distortions of the kind described in Article 116.

These provisions demonstrate that harmonisation is not based on a single legislative technique. The Treaties provide several mechanisms adapted to different regulatory circumstances.

14. The Notification of National Technical Regulations: Directive (EU) 2015/1535

An important preventive mechanism operates alongside mutual recognition and harmonisation.

Directive (EU) 2015/1535 establishes a procedure through which Member States must notify the Commission of draft technical regulations concerning products and rules on information society services before their adoption.

The objective is to identify potential obstacles to the internal market while national legislation is still being prepared.

The procedure is particularly important because technical requirements may create barriers even where they do not expressly discriminate against products originating in other Member States.

14.1 Notification and standstill

Under Article 5 of the Directive, Member States must communicate draft technical regulations to the Commission before adopting them, together with the relevant information and justification.

Notification triggers a standstill period, normally lasting three months, during which the notifying Member State must refrain from adopting the draft regulation.

The Commission and other Member States can examine the proposed measure and submit comments or detailed opinions where they identify potential incompatibilities with EU law or internal market principles.

A detailed opinion can extend the standstill period, allowing additional examination and dialogue. The Directive also provides for a specific procedure where the Member State invokes urgency.

14.2 Legal significance

The notification procedure is not itself a harmonisation instrument. It does not automatically replace national technical rules with common EU standards.

Instead, it provides transparency and an opportunity to prevent new barriers before they become part of national law.

It also helps the Commission identify areas in which divergent national approaches may indicate a need for future harmonisation.

Failure to comply with the notification obligation may have significant legal consequences. In CIA Security International, Case C-194/94, the Court held that the failure to notify a technical regulation in accordance with the applicable notification procedure could render that regulation inapplicable against individuals.

The judgment established that the notification requirement is not merely an internal administrative formality. It protects the functioning of the internal market by ensuring that proposed technical barriers are subject to prior scrutiny.

15. The Relationship Between Mutual Recognition and Harmonisation

Mutual recognition and harmonisation form a coordinated system.

Mutual recognition is particularly important where the Union has not adopted common rules. It allows national regulatory systems to coexist while preventing unjustified restrictions on cross-border economic activity.

Harmonisation is used where common requirements are necessary to remove persistent obstacles, establish consistent protection or create sufficient legal certainty.

The two approaches can also operate simultaneously.

For example, EU legislation may harmonise certain safety requirements for a category of products while leaving other aspects, such as additional characteristics or particular uses, subject to national regulation. Mutual recognition may remain relevant to those aspects not covered by the harmonised framework.

This means that the existence of harmonisation does not necessarily eliminate the relevance of Article 34 TFEU or mutual recognition for every aspect of a product.

The applicable legal framework must be identified precisely. The first question is whether EU legislation regulates the relevant product or activity and, if so, whether it provides full or partial harmonisation. Where the matter remains outside the harmonised framework, the Treaty provisions and the mutual recognition principle may continue to apply.

The distinction also has institutional significance. Mutual recognition frequently requires national authorities to justify restrictions in individual cases. Harmonisation, by contrast, involves a legislative process through which the Union establishes common rules applicable across the Member States.

Together, these mechanisms allow the internal market to develop without requiring the complete replacement of national legal systems.

16. Proportionality and the Protection of Legitimate Public Interests

Neither mutual recognition nor harmonisation eliminates the need to protect legitimate public interests.

Member States retain responsibility for areas such as public health, consumer safety, environmental protection and public security, subject to the requirements of EU law.

Article 36 TFEU expressly permits certain restrictions on the free movement of goods, including those justified by public morality, public policy, public security, the protection of health and life of humans, animals or plants, the protection of national treasures possessing artistic, historic or archaeological value, and the protection of industrial and commercial property.

These derogations must not constitute arbitrary discrimination or disguised restrictions on trade.

The Court has also recognised mandatory requirements of public interest under the case law developed from Cassis de Dijon.

In both contexts, proportionality is essential.

A national restriction must be suitable for achieving its stated objective. It must also be necessary, meaning that the objective cannot be achieved through a less restrictive measure that provides an equivalent level of protection.

The existence of a legitimate public interest does not automatically validate every national requirement adopted in its name.

The mutual recognition framework therefore requires a substantive assessment of the actual risks and the effectiveness of the proposed measure. A Member State cannot simply assert that its own technical standard is preferable or more familiar.

Similarly, harmonisation legislation must respect the principle of proportionality under Article 5(4) TEU. The content and form of Union action must not exceed what is necessary to achieve the Treaty objectives.

17. Practical Examples

Example 1: A food product lawfully marketed in another Member State

A manufacturer produces a packaged food product that complies with the relevant technical rules in its Member State of origin. The product is not covered by comprehensive EU harmonisation legislation.

The destination Member State requires additional domestic packaging specifications and refuses to permit the product’s sale because it does not satisfy them.

The manufacturer may rely on Articles 34–36 TFEU and the mutual recognition principle. The destination authority must examine whether its requirements are justified by a legitimate public interest and whether they are proportionate.

Regulation (EU) 2019/515 may provide the relevant procedural framework for challenging the restriction.

Example 2: A product subject to harmonised safety requirements

A manufacturer produces electrical equipment that falls within an EU harmonisation framework establishing common safety and conformity-assessment requirements.

The product satisfies the applicable EU requirements and carries the required conformity documentation.

A Member State cannot ordinarily impose additional national technical requirements within the harmonised field simply because its domestic standards differ.

The applicable harmonisation legislation determines the extent of the Member State’s regulatory authority, including any permitted national safeguards.

Example 3: Recognition of professional qualifications

A professional qualified in one Member State applies to practise a regulated profession in another.

The host Member State cannot simply disregard the applicant’s qualification because it was obtained abroad. It must apply the relevant recognition framework, including Directive 2005/36/EC where applicable.

Where substantial differences exist and the Directive permits compensation measures, the authority may require an adaptation period or aptitude test.

The assessment must comply with the applicable EU requirements and cannot become an unjustified barrier to professional mobility.

Example 4: A national technical regulation adopted without notification

A Member State introduces a new technical requirement for certain products without notifying the Commission when the notification procedure under Directive (EU) 2015/1535 applies.

The requirement subsequently prevents products from other Member States from entering the national market.

The failure to notify may have consequences for the enforceability of the national measure, as illustrated by CIA Security International. The national court must consider the relevant EU-law principles and the consequences of the procedural breach.

18. Enforcement and Institutional Responsibilities

The effective operation of mutual recognition and harmonisation depends on cooperation between EU institutions, national authorities, businesses and courts.

The European Commission monitors the application of internal market legislation and may initiate infringement proceedings under Articles 258–260 TFEU where a Member State fails to comply with its EU obligations.

National authorities are responsible for applying the relevant EU legislation, assessing requests for market access and ensuring that administrative decisions comply with mutual recognition and proportionality requirements.

National courts provide judicial protection to individuals and businesses affected by national measures. They may interpret and apply EU law and, where necessary, refer questions to the Court of Justice under Article 267 TFEU.

The Court of Justice ensures the uniform interpretation of the Treaties and the validity of EU acts. Its case law has been particularly important in developing mutual recognition, defining the limits of national regulatory autonomy and controlling the use of harmonisation powers.

The Commission also supports administrative cooperation through mechanisms such as SOLVIT, Product Contact Points and the notification system established by Directive (EU) 2015/1535.

These arrangements recognise that the internal market cannot function effectively through legislation alone. It requires transparent administration, accessible procedures and effective judicial remedies.

19. Key Takeaways

1. Mutual recognition and harmonisation are complementary mechanisms for achieving the European Union’s internal market.
2. Mutual recognition generally requires Member States to accept goods lawfully marketed in another Member State where no comprehensive EU harmonisation framework governs the relevant requirements.
3. The principle originated in the Court of Justice’s judgment in Cassis de Dijon, Case 120/78.
4. National restrictions may be justified by legitimate public interests, but they must satisfy proportionality and cannot constitute arbitrary discrimination or disguised restrictions on trade.
5. Mutual recognition also operates in fields such as professional qualifications, services and company establishment, although the applicable legal frameworks differ.
6. Regulation (EU) 2019/515 establishes procedures for applying mutual recognition to goods, including voluntary declarations, administrative assessments, justified decisions and cooperation mechanisms.
7. Article 114 TFEU is the principal legal basis for harmonising national legislation where differences obstruct or threaten the functioning of the internal market.
8. Article 114 does not confer unlimited legislative authority. EU harmonisation measures must genuinely pursue internal market objectives and comply with the principle of proportionality.
9. Minimum harmonisation establishes common standards while potentially permitting stricter national protection. Maximum harmonisation seeks uniform rules and generally restricts additional national requirements unless expressly permitted.
10. Article 115 TFEU and other Treaty provisions provide additional legal bases for approximation of national laws.
11. Directive (EU) 2015/1535 requires notification of relevant draft technical regulations and creates an important preventive mechanism against new barriers to trade.
12. The Court of Justice, national courts, the Commission and national administrative authorities all contribute to the enforcement of mutual recognition and harmonisation.

20. Frequently Asked Questions

What is the difference between mutual recognition and harmonisation?

Mutual recognition requires a Member State, in defined circumstances, to accept goods or other regulatory outcomes lawfully established in another Member State, even where national rules differ. Harmonisation involves adopting common EU rules that approximate or unify national requirements.

Does mutual recognition mean that every product sold in one Member State must be accepted in all others?

No. The principle is subject to legitimate public-interest restrictions, including those protecting public health, safety and the environment. Any restriction must satisfy the applicable Treaty requirements and proportionality.

What did the Cassis de Dijon judgment establish?

The judgment established that products lawfully produced and marketed in one Member State should generally have access to other Member States’ markets. It also recognised that certain national requirements applying without distinction may constitute restrictions on free movement and require justification.

What is Regulation (EU) 2019/515?

It is the EU regulation governing the application of mutual recognition to goods lawfully marketed in another Member State. It establishes procedures for assessing goods, voluntary mutual recognition declarations, administrative decisions and cooperation between national authorities.

What is Article 114 TFEU used for?

Article 114 provides the principal legal basis for adopting EU measures approximating national laws, regulations and administrative provisions where this is necessary for the establishment and functioning of the internal market.

What is the difference between minimum and maximum harmonisation?

Minimum harmonisation establishes a common level of protection while potentially allowing Member States to adopt stricter rules. Maximum harmonisation seeks to establish uniform requirements and generally prevents additional national rules unless the EU legislation expressly permits them.

Can a Member State maintain stricter national rules after harmonisation?

Sometimes. The answer depends on the harmonisation measure and the applicable Treaty provisions. Articles 114(4) and 114(5) TFEU establish specific procedures for maintaining or introducing certain national provisions under defined conditions.

What happens if a Member State fails to notify a draft technical regulation?

Where Directive (EU) 2015/1535 applies, failure to comply with the notification procedure may affect the enforceability of the national technical regulation against individuals. The judgment in CIA Security International, Case C-194/94, is particularly important in this respect.

Does harmonisation eliminate national legal systems?

No. Harmonisation approximates national rules in defined areas. Member States retain their legal systems and regulatory responsibilities in matters not fully governed by EU legislation, subject to their obligations under the Treaties.

Can mutual recognition apply to professional qualifications?

Yes. Directive 2005/36/EC establishes a framework for recognising professional qualifications obtained in other Member States. The applicable procedure depends on the profession and the relevant qualification.

21. Conclusion

Mutual recognition and harmonisation represent two different but interconnected approaches to the legal integration of the European internal market.

Mutual recognition allows national legal systems to remain diverse while requiring Member States to respect the lawful regulatory decisions and market access rights of their counterparts. Its development through Cassis de Dijon demonstrated that economic integration could not be achieved merely by removing customs duties and express import restrictions. National technical rules could also obstruct trade and therefore required judicial scrutiny.

Harmonisation addresses a different dimension of the same problem. Through Article 114 TFEU and other Treaty provisions, the Union may adopt common rules where regulatory divergence creates obstacles or where uniform protection is necessary. The distinction between minimum and maximum harmonisation determines how much national regulatory discretion remains after EU legislation has been adopted.

Neither approach requires the complete disappearance of national regulatory autonomy. Instead, both operate within a constitutional framework that balances market integration, national competence, legitimate public interests and proportionality.

The internal market is therefore not based on the assumption that all Member States must regulate economic activity identically. It is based on the legal requirement that differences between national systems must not become unjustified barriers to cross-border activity.

Mutual recognition provides the means to accommodate legitimate diversity. Harmonisation provides the means to establish common standards where diversity itself becomes an obstacle. Together, they form one of the central legal foundations of European economic integration.

22. Primary Legal Sources and Further Reading

Treaty provisions

• Article 26 TFEU – The Internal Market
• Articles 34–36 TFEU – Free Movement of Goods and Derogations
• Article 49 TFEU – Freedom of Establishment
• Article 56 TFEU – Freedom to Provide Services
• Article 114 TFEU – Approximation of Laws
• Article 115 TFEU – Approximation Through Directives
• Articles 116–117 TFEU – Distortions Resulting from Differences Between National Laws

EU legislation

• Regulation (EU) 2019/515 on Mutual Recognition of Goods Lawfully Marketed in Another Member State
• Directive (EU) 2015/1535 on the Notification of Technical Regulations
• Directive 2005/36/EC on the Recognition of Professional Qualifications
• Directive 2006/123/EC on Services in the Internal Market

Court of Justice case law

• Rewe-Zentral AG v Bundesmonopolverwaltung für Branntwein (Cassis de Dijon), Case 120/78.
• Commission v Germany, Case 178/84.
• Keck and Mithouard, Joined Cases C-267/91 and C-268/91.
• Germany v Parliament and Council (Tobacco Advertising), Case C-376/98.
• CIA Security International, Case C-194/94.
• Centros, Case C-212/97.
• Überseering, Case C-208/00.
• Inspire Art, Case C-167/01.

European Commission resources

• Mutual Recognition of Goods
• The 2015/1535 Notification Procedure
• Technical Regulation Information System – TRIS