Undated Cheque: The Requirement of Unequivocal Agreement – Cass. com., 4 February 2026, No. 23-14.413

Is the cheque becoming a legal trap for overly patient creditors? While it now represents only 2.3% of payment transactions in France, its technicality remains formidable. In a notable judgment of 4 February 2026, the Court of Cassation has just reiterated a fundamental rule: if you receive an undated cheque, you cannot fill in the date yourself without the explicit consent of the drawer. In the absence of such “unequivocal” consent, the document loses its qualification as a cheque, rendering any action for payment inadmissible. A review of a case that pits the proof of a loan against the rigorous formalism of the law of negotiable instruments.

The case opposing Mr [T] and Mr [K], which resulted in the Court of Cassation judgment of 4 February 2026, provides a fundamental clarification on cheque formalism and the conditions under which the payee may validly fill in the date.

CA Grenoble, 1re ch., 7 févr. 2023, n° 21/00761

Cass. com., 4 févr. 2026, n° 23-14.413

I. Factual background and the initial dispute

The dispute originated in a relationship of trust maintained since 1994 between Mr [T] and Mr [K]. Mr [T] claims to have granted Mr [K] a loan of 47,933 euros during the year 2010. As security for this loan, Mr [K] allegedly gave him two undated cheques.

In 2017, seven years later, Mr [T] filled in the date on the cheques himself (21 February 2017) and presented them for encashment. The cheques were rejected for insufficient funds, then for non-conforming signature. Mr [T] then sued Mr [K] in 2018 to obtain repayment of the loan and, in the alternative, payment under an action on the instrument.

II. The failure of the claims based on the loan and unjust enrichment

Before the Grenoble Court of Appeal, Mr [T] invoked several legal grounds, each of which was dismissed in turn:

A. The absence of proof of the loan agreement

Although the action was held to be admissible because the limitation period only began to run from the formal demand of 2017, the Court rejected the claim on the merits:

• Insufficient evidence: “Mr [T] must demonstrate not only the disbursement of funds […] but also provide proof of the existence of a loan agreement”.
• Requirement of a written instrument: In the absence of a written document (Article 1341 of the Civil Code), the cheques do not constitute sufficient proof of the intention to lend.

B. The inadmissibility of the unjust enrichment claim

Mr [T] attempted to invoke unjust enrichment (Article 1303 of the Civil Code) on a subsidiary basis. The Court recalled the subsidiary nature of this action:

“It cannot be used to supplement another action extinguished by the effect of the limitation period”.

III. The pivot of the case: the validity of the cheque and the action on the instrument

It is on the ground of the action on the instrument (based on cheque law) that the legal debate becomes most technical.

The reasoning of the Court of Appeal (Limitation)

The Grenoble Court of Appeal had initially declared the action on the instrument time-barred. It held that Mr [T] should have noticed the irregularities (discrepancies between the amounts in words and figures) as early as the delivery of the cheques in 2010. Using the most favourable date (31 December 2010), the 5-year limitation period had expired by the time the proceedings were commenced in 2018.

The position of the Court of Cassation (Formalism)

In its judgment of 4 February 2026, the Court of Cassation dismissed the appeal but effected a substitution of grounds. It did not rule on the limitation issue, but on the validity of the instrument itself.

It recalled the following principles derived from the Monetary and Financial Code:

1. Mandatory particulars: The drawer must affix the date of issue on the cheque.
2. Sanction: In the absence of a date, “the instrument does not constitute a cheque”.
3. Completion by the payee: If the payee may fill in the date, this is subject to a strict condition:

“Only with the unequivocal consent of the latter [the drawer]”.

In this case, as Mr [T] had affixed the date of 21 February 2017 without the consent of Mr [K], the instruments could not be treated as valid cheques. Consequently, the action on the instrument was inadmissible, not on the ground of limitation, but due to the absence of a valid instrument.

IV. Conclusion and scope of the decision

This decision considerably strengthens the protection of the drawer (the person who signs the cheque). It recalls that a cheque is not a discretionary credit instrument that the holder may activate at will years later without explicit consent.

Practical advice: A holder who completes a cheque lacking a date of issue must imperatively secure proof of the clear and explicit consent of the drawer to avoid the nullity of the instrument.