French Supreme Court, 1st Civil Chamber, 25 March 2026, appeal No. 24-20.953
🔑 Key Takeaways
- The formal notice that precedes acceleration is a substantive formality which must sufficiently call upon the debtor (former Article 1139 of the Civil Code (code civil)).
- It must enable the debtor to know the nature, cause and extent of their obligation.
- Where the loan contract was restructured after an over-indebtedness moratorium and given a new number, a formal notice referring only to the new number without an explicit statement of account or reminder of the original loan is insufficient.
- The court cannot consider that a mere “administrative renumbering” releases the bank from providing a clear statement of account and an explicit reference to the original contract.
- This decision reopens a powerful line of defence for borrowers coming out of an over-indebtedness moratorium against whom acceleration was declared on the basis of imprecise formal notices.
Table of Contents ▼
- What was the background to the case?
- Why is the formal notice a substantive formality?
- What is the protective function of the formal notice?
- What are the conditions of validity?
- What does the requirement of a “sufficient call upon the debtor” mean?
- Identifying the nature of the obligation
- Identifying the cause of the obligation
- Identifying the extent of the obligation
- Why does renumbering after a moratorium cause a problem?
- What are the practical consequences for borrowers?
- How to build a defence after this judgment?
- FAQ: Frequently Asked Questions
What was the background to the case?
In March 2011, a mutual bank granted a couple two home loans: a first one of €153,000 over 180 months at a rate of 4.07%, and a second one of €36,000 over 264 months with no interest (probably an interest-free loan). The two contracts are identified by separate numbers.
A few years later, the borrowers encountered financial difficulties and filed an over-indebtedness application. In October 2019, a consumer over-indebtedness commission imposed a 24-month moratorium on the repayment of their loans, starting on 31 October 2019. During this period, instalments were suspended; the borrower could catch their breath.
At the end of the moratorium, in late October 2021, the bank administratively restructured the two loans. The old numbers were replaced by new ones: the first loan became No. “8647 38449 53” (instead of “8645 86345 82”), the second became No. “8647 378449 56” (instead of “8645 86345 92”). The bank took the view that this was merely a renumbering without novation, without the creation of new contracts.
The borrowers did not resume their payments regularly. On 17 May 2022, the bank sent them formal notices referring to the new loan numbers, but which, as the judgment reveals, display certain inconsistencies (the letters in fact refer to yet another number, “8645 10249 89”). On 17 June 2022, the bank accelerated the loans and, on 27 September 2022, sued the borrowers for payment.
In August 2024, the Nancy Court of Appeal (cour d’appel) upheld the acceleration. It considered that the new numbering was explained by the over-indebtedness moratorium and that the bank could validly send the borrowers formal notices using the new numbers. The borrowers lodged an appeal on points of law which resulted, on 25 March 2026, in a full quashing of the decision.
Why is the formal notice a substantive formality?
A formal notice is the act by which a creditor calls upon its debtor to perform their obligation, giving them a period in which to do so and warning them of the consequences of non-performance. It may take the form of a summons served by a bailiff, an equivalent act, or a letter where it shows a “sufficient call upon the debtor” (former Article 1139 of the Civil Code, now Article 1344).
What is the protective function of the formal notice?
The formal notice is not a mere administrative formality: it fulfils an essential protective function for the debtor. Before a creditor can declare acceleration (déchéance du terme), that is, demand immediate repayment of all the sums remaining to be paid, although they were not due under the contractual schedule, the debtor must have had a fair chance to regularise their situation.
This logic is particularly strong in consumer credit. The legislature, through Article L. 312-39 (now L. 313-51) of the Consumer Code (code de la consommation) for home loans, and through Article L. 311-24 (now L. 312-39) for consumer credit, regulates acceleration and requires a sufficiently precise prior formal notice. European case law goes in the same direction (CJEU, Banco Primus, 26 January 2017, C-421/14).
The formal notice is therefore a last-chance mechanism: it allows the debtor to understand what is being alleged against them, to quantify what they owe, and to try, within the period allowed, to regularise or negotiate a new repayment schedule. If it is deficient, the acceleration is flawed and the bank cannot demand immediate full repayment.
What are the conditions of validity?
Case law has gradually clarified the conditions of validity of the formal notice. To be effective, it must:
- identify the debtor and the creditor unambiguously;
- designate precisely the contract or debt concerned;
- state the amount of the sums due, broken down by nature (principal, interest, fees, penalties);
- set a reasonable period for regularisation;
- warn of the consequences of non-payment (acceleration, immediate payability, application of default interest).
The judgment under review insists in particular on the statement of account and on the traceability of the contract: the formal notice must enable the debtor to identify the nature, cause and extent of their obligation.
What does the requirement of a “sufficient call upon the debtor” mean?
The judgment of 25 March 2026 restates, in what is now a classic formula: “the formal notice, which constitutes a mandatory invitation addressed to the debtor to regularise their situation within the period allowed, must enable the person concerned to know the nature, the cause and the extent of their obligation”. This triple identification (nature, cause, extent) structures the court’s review.
Identifying the nature of the obligation
The nature of the obligation is its legal characterisation: is it an outstanding principal balance, interest arrears, contractual penalties, administration fees? A formal notice that merely states a lump sum, without a breakdown between these items, does not allow the debtor to understand what they are actually paying and to challenge any items that may be open to challenge (for example unlawful penalties or excessive fees).
Identifying the cause of the obligation
The cause of the obligation is the contract or legal event that gave rise to the debt. The formal notice must therefore refer clearly to the loan in dispute, by its date, its parties and its essential characteristics. Where a loan has been modified by a moratorium, an amendment or a renumbering, the link between the debt claimed and the original loan must be made explicit.
Identifying the extent of the obligation
The extent of the obligation is the exact amount claimed, broken down by item and calculated transparently. A formal notice that claims a lump sum, without detail, without an updated amortisation schedule and without any indication of the arrears and default interest applied, does not meet this requirement.
📊 Diagram: The Triple Identification Required by the Court
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CAUSE: link to a specific contract, identified by its date, its parties and its characteristics.
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EXTENT: exact amount claimed, broken down by item, with a transparent statement of account.
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If even one of these three components is missing: the formal notice is insufficient and cannot serve as the basis for a valid acceleration.
Why does renumbering after a moratorium cause a problem?
In the case under review, the bank had restructured the loans after the over-indebtedness moratorium and assigned them new numbers. It then sent formal notices referring only to the new numbers, without stating in the body of the letter that these numbers corresponded to earlier contracts originally taken out in March 2011 and modified by the October 2019 moratorium.
The Nancy Court of Appeal had considered that this renumbering was explained by the moratorium and that it did not constitute a novation, that is, it did not create a new contract. In its view, the formal notice could therefore validly refer to the new numbers without an express reminder of the old ones.
The French Supreme Court rejects this reasoning. It states, in a directly applicable formula: “in so deciding, without indicating how the formal notices sent to the borrowers, referring to a contract No. 8647 38449 53, with no statement of account explaining the nature of the lump sum claimed and no reference to the restructuring of loan No. 8645 86345 82 taken out by the borrowers, enabled them to identify the nature, the cause and the extent of their obligation, the Court of Appeal deprived its decision of a legal basis”.
The message is clear: it matters little that, legally, this is a mere administrative renumbering. From the debtor’s point of view, who does not have a perfect record of their contracts, receiving a formal notice mentioning a loan number different from the ones they signed creates legitimate confusion. The creditor must therefore, in the formal notice itself, make explicit the link between the restructured number and the original contract, and provide a clear statement of the sums claimed.
In the case under review, the inconsistency was particularly glaring: the Court of Appeal noted that the formal notices referred to a contract No. 8645 10249 89, whereas the bank intended to pursue performance of contract No. 8647 38449 56. The quashing was therefore also ordered for distortion (dénaturation) of the clear and precise terms of the formal notices.
What are the practical consequences for borrowers?
This judgment gives a very powerful line of defence to several categories of borrowers.
The first category consists of borrowers who have come out of an over-indebtedness plan with a moratorium and who are now being asked by their bank for sums on the basis of imprecise letters. Any formal notice that does not make the explicit link between the original contracts and the restructured contracts, or that does not contain a clear statement of account, can be challenged.
The second category consists of borrowers who signed amendments to the initial contract (change of term, change of rate, incorporation of new capital), and whose loans the bank subsequently renumbered or renamed. The same traceability requirement applies: the formal notice must make the link.
The third category, more broadly, consists of borrowers sued for payment after acceleration: they can systematically challenge the formal regularity of the prior formal notice, by requiring production of the original letter and analysing whether the three elements (nature, cause, extent) actually appear in it.
The consequences of a formal notice held to be insufficient are substantial. As the acceleration is flawed, the bank cannot demand immediate full repayment. It must return to the contractual schedule and, if it wishes to declare acceleration again, start a regular procedure afresh (new compliant formal notice, new period, new declaration). In the meantime, the borrower keeps the benefit of the term and can negotiate on far more favourable terms.
How to build a defence after this judgment?
For a borrower facing a claim for payment after acceleration, several steps are worth following.
First step: gather all the documentation. This means collecting the original contracts, the amendments, the decisions of the over-indebtedness commission, the notifications of the moratorium and of the plan, any renumbering notified by the bank, all the formal notices received, the letter declaring acceleration, and the successive statements of account sent by the bank.
Second step: analyse each formal notice in light of the triple requirement set out by the Court. For each letter, check whether:
- the nature of the sums is broken down (principal / interest / penalties);
- the cause is clearly linked to the original contract, with mention of the date of signature, the parties, and where relevant any amendments or restructurings;
- the extent is quantified by a transparent statement of account that allows the calculations to be verified.
Third step: identify the inconsistencies. Renumbering can generate errors (numbers wrongly carried over, contradictory sums between the formal notice and the summons, inconsistent dates). Any inconsistency strengthens the ground of appeal based on distortion, as the case under review shows, where the Court of Appeal itself introduced an additional distortion by referring to yet another number.
Fourth step: combine the defence with other arguments. The challenge to the regularity of the formal notice can be combined with:
- limitation, where the two-year period under Article L. 218-2 of the Consumer Code has expired;
- the challenge to excessive contractual penalties;
- failure to provide the guarantor with the annual information where a guarantee is involved;
- any unfair terms incorporated in the contract (penalties, automatic default interest, disproportionate sanctions);
- the bank’s liability for failure to warn, where the transaction appears in hindsight to have been poorly calibrated.
⚖️ Diagram: Defence Strategy Where Acceleration Is Contested
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2. Analyse the formal notice in light of the triple requirement (nature/cause/extent).
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3. Spot the inconsistencies (numbers, sums, dates).
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4. Combine with complementary arguments (limitation, unfair terms, duty to warn).
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5. Seek: nullity of the acceleration, return to the contractual schedule, restitution of contractual indemnities unduly collected.
As regards residual avenues for compensation, it is worth recalling that the bank may also be pursued on the basis of its obligations under the RTS technical regulation of the European Banking Authority (Regulatory Technical Standards supplementing PSD2), still under-used in banking litigation but which can, in certain cases, complement the traditional grounds.
Conclusion: A Welcome Reminder of the Formal Rigour Required of Banks
The judgment delivered on 25 March 2026 by the First Civil Chamber follows a long-standing line of case law that banks nonetheless continue to neglect. The formal notice is not a mere procedural formality: it is a substantive protection for the debtor, who must be able to understand exactly what is being claimed and why before the spiral of acceleration and enforcement begins.
For borrowers in difficulty, in particular those coming out of an over-indebtedness plan with a moratorium, the judgment reopens much wider margins of defence than is often thought. An imprecise formal notice (a reference to a loan number with no reminder of the original contract, no itemised statement of account, an unexplained lump sum) is enough to invalidate the acceleration. And with it, the whole procedure of seizure, mortgage registration or enforcement that follows.
The firm LE BOT Avocat regularly assists borrowers facing these situations. A rigorous analysis of the chain of formal notices, statements of account and successive numberings makes it possible, in many cases, to turn an apparently closed situation into a favourable outcome.
