1. Meaning and Legal Basis

The preliminary reference procedure under Article 267 TFEU allows (and sometimes requires) national courts to refer questions of EU law to the CJEU for authoritative interpretation or validity review.

It creates a cooperative judicial system between:

• National courts (apply EU law in disputes)
• CJEU (ensures uniform interpretation)

The key issue is when a national court is obliged to refer a question, i.e., the “threshold obligation”.

2. The Three Threshold Levels of Obligation

(A) Discretionary Reference (Article 267(2) TFEU)

Any national court may refer if:

• EU law interpretation is necessary to decide the case.

Threshold:

✔ Relevance to judgment
✔ Genuine legal uncertainty

Case law:

• Cartesio (C-210/06)
  National courts have full discretion to refer questions of EU law even if higher courts disagree.

(B) Mandatory Reference (Courts of Last Instance) – Article 267(3) TFEU

Courts whose decisions are not subject to further judicial appeal must refer when:

Core threshold:

✔ EU law question is necessary to decide the case
✔ No exception applies (see below)

Key case:

• Lyckeskog (C-99/00)
  Confirms that courts of last instance are strictly bound by Article 267(3).
• Commission v France (C-416/17)
  France was found in breach for failure of its highest administrative court to refer EU law questions → confirms obligation is enforceable, not symbolic.

(C) Exceptions to Mandatory Reference (CILFIT Doctrine)

Even courts of last instance are NOT required to refer if:

1. Acte Clair (clear answer)

• EU law is so obvious that no reasonable doubt exists.

2. Acte Éclairé (already settled)

• CJEU has already ruled on the same issue.

Leading case:

• CILFIT (Case 283/81)

Threshold test from CILFIT:

A court may avoid reference only if:

• Correct interpretation is so obvious as to leave no doubt
• Must consider:
  • All EU language versions
  • Context of EU law
  • Purpose (teleological interpretation)

👉 This makes “acte clair” a very strict threshold, not a simple “it seems clear” test.

3. Expansion and Refinement of Threshold Obligations

(A) Duty of Reasoned Refusal

Even when refusing to refer, courts must give reasons.

Case:

• Consorzio Italian Management (C-561/19)
  Reinforced that refusal to refer must be properly justified.

(B) Abuse of Discretion Limits

Courts cannot avoid reference simply because:

• They believe interpretation is obvious
• National law discourages reference

Case:

• Cartesio (C-210/06)
  National procedural rules cannot restrict Article 267 powers.

(C) Structural Enforcement through Infringement Actions

Failure to refer can lead to state liability or EU infringement proceedings.

Case:

• Commission v France (C-416/17)
  First major ruling confirming that failure of a supreme court to refer can breach EU law obligations.

4. Conceptual Threshold Framework

The obligation to refer depends on three thresholds:

1. Institutional Threshold

Is the body a “court or tribunal”?

Criteria (EU autonomous definition):

• Established by law
• Permanent
• Independent
• Compulsory jurisdiction
• Applies legal rules

(derived from cases like Dorsch Consult and Syfait)

2. Functional Threshold

Is the question:

• Necessary to decide the case?
• About interpretation or validity of EU law?

If irrelevant → no obligation.

3. Hierarchical Threshold

Is the court:

• Last instance court?
  If YES → Article 267(3) obligation applies.

5. Key Case Law Summary (Core Doctrine Set)

1. CILFIT (Case 283/81)

• Established acte clair + acte éclairé exceptions
• Set strict threshold for avoiding referral

2. Cartesio (C-210/06)

• Lower courts have absolute discretion
• National rules cannot limit referral power

3. Lyckeskog (C-99/00)

• Defines “court of last instance”
• Confirms mandatory referral rule

4. Commission v France (C-416/17)

• Failure to refer can trigger EU infringement liability
• Strengthens enforceability of Article 267(3)

5. Consorzio Italian Management (C-561/19)

• Courts must give reasoned justification when refusing to refer
• Reinforces procedural accountability

6. Foto-Frost (C-314/85)

• National courts cannot declare EU acts invalid
• Must refer validity questions to CJEU

👉 Important threshold rule:
If validity is in doubt → mandatory referral

7. Rheinmühlen (C-166/73)

• National courts cannot be prevented by higher courts from making references
• Reinforces independence of referral threshold

6. Practical Threshold Summary

A national court must refer to the CJEU when:

✔ EU law interpretation or validity is necessary
✔ The court is last instance (unless CILFIT exception applies)
✔ There is genuine legal uncertainty
✔ EU act validity is questioned

It may refuse only when:

✔ Acte clair (extremely obvious interpretation)
✔ Acte éclairé (already decided by CJEU)
✔ Question is irrelevant or hypothetical

7. Conclusion

The preliminary reference obligation thresholds under Article 267 TFEU form a structured system balancing:

• National judicial autonomy
• EU legal uniformity
• Individual legal protection

The CJEU case law—especially CILFIT, Cartesio, Lyckeskog, Foto-Frost, and Commission v France—shows that:

The obligation to refer is strong, structured, and narrowly limited by strict exceptions, ensuring that EU law remains uniform while preserving national court participation in its application.