European decisions finding anticompetitive conduct connected with Euribor do not automatically render clauses in loans indexed to that benchmark void.
The Court of Justice of the European Union clarified this in its judgment of 3 September 2026, Case C-60/25, following a preliminary reference from the Cagliari Court of Appeal.
The judgment defines the effects the European Commission’s findings concerning the euro interest rate derivatives cartel may have in litigation over ordinary financing agreements.
The Court did not hold every Euribor clause necessarily valid. Rather, it ruled out automatic invalidity based solely on the antitrust decisions where the contract was concluded in a different market, between parties outside the cartel and without the purpose of implementing it.
The case
The dispute concerned a mortgage loan concluded in December 2005.
The agreement set a nominal annual interest rate of 3.60% for the first six months. Thereafter, interest was calculated by adding a fixed margin of 1.50% to six-month Euribor.
The borrower sued before the Oristano Court seeking recalculation of the loan, arguing that the rate was determined using a benchmark affected by the anticompetitive conduct established by the European Commission.
The Court dismissed the claim. The proceedings continued before the Cagliari Court of Appeal, which referred questions to the Court of Justice about the antitrust decisions’ effects on the loan clause.
The market examined by the European Commission
The findings referred to concerned the euro interest rate derivatives market, commonly known as EIRD.
In 2013 and 2016, the Commission established conduct aimed at restricting or distorting competition in those financial products, including exchanges of information and attempts to influence benchmarks used to determine derivative payments.
The Court of Justice nevertheless observed that an ordinary mortgage loan belongs to a market distinct from derivatives.
A finding of infringement in the EIRD market therefore cannot automatically extend to every contract using Euribor for indexation.
The principle established
According to the Court of Justice, a finding of an anticompetitive agreement or benchmark manipulation:
- does not automatically invalidate every contractual clause referring to that benchmark;
- must be considered by the national court within the precise material, personal, temporal and territorial limits of the established infringement;
- cannot invalidate a clause in a different market when the parties did not participate in the cartel;
- does not entail nullity if the contract was not concluded to implement the anticompetitive conduct.
The mere presence of Euribor in a contract is therefore insufficient to establish a legally relevant connection to the cartel.
What the Court did not decide
The judgment is not a general declaration that Euribor clauses are valid.
The Court of Justice did not determine:
- whether the individual loan clause was valid under Italian law;
- whether the benchmark was specified with sufficient certainty and transparency;
- whether the rate actually applied was correct;
- whether the borrower was entitled to repayment of any sums;
- which substitute rate should be applied, if any;
- whether independent grounds for a damages claim existed.
These matters remain for the national court, within the claims made and evidence obtained.
Implications for banking litigation
The judgment narrows challenges based solely on the general assertion that Euribor was manipulated.
Assessing a claim concerning an indexed loan requires distinguishing at least three issues.
The first concerns antitrust law. Anyone relying on the Commission’s decisions must explain the contract’s personal, temporal and material connection with the established conduct.
The second concerns the clause’s validity and ascertainability under national law. Even without a link to the cartel, it may be necessary to check whether the agreement permits objective, unambiguous determination of the rate.
The third concerns possible loss. A damages claim requires identification of the conduct, actual loss suffered and causal connection.
Useful checks for borrowers
A documented challenge should not merely cite European decisions generically. It must consider:
- the loan’s conclusion date;
- the type of Euribor referred to;
- the observation period and source;
- the margin applied;
- contractual calculation methods;
- the lender’s identity;
- any participation of entities involved in the infringement;
- the relationship between the contract and market examined;
- the rate actually applied;
- the economic loss specifically alleged.
Checks for banks and assignees
Nor does the decision automatically resolve every Euribor-related challenge.
A bank or assignee pursuing recovery must still produce the complete contract and document its interest calculation method.
The following remain relevant:
- clarity of the indexation clause;
- ascertainability of the rate;
- correct application of the margin;
- consistency between contract, repayment schedule and statements;
- proof of the debt claimed;
- any contractual transparency issues.
Relationship with case law on ascertainability of the rate
The European judgment concerns a different issue from the one examined by the Italian Court of Cassation in Order No. 19348 of 11 June 2026.
The Court of Cassation considered unambiguous determination of the variable rate, including the 360/365 basis and day-count method.
The Court of Justice instead examined the European antitrust decisions’ effects on contractual validity.
The principles can coexist: absence of automatic nullity arising from the cartel does not prevent independent review of whether the clause is sufficiently certain and correctly applied.
Conclusions
The decision of 3 September 2026 excludes an automatic outcome but does not close every possible dispute over Euribor-linked loans.
The Commission’s decisions on the derivatives market do not alone invalidate a clause in a loan belonging to another market and concluded between parties outside the cartel.
Clause validity, calculation accuracy and possible loss must be established separately from the contract, accounting documents and specific circumstances.
The judgment thus requires more precise challenges and rigorous documentary examination, avoiding automatic nullity and blanket presumptions of validity alike.