The Seller Duty to Inform and Advise in France

The general pre-contractual duty to inform (Article 1112-1)

Every party negotiating a contract in France owes a general pre-contractual duty to inform the other side. Article 1112-1 of the Civil Code provides that a party who knows information whose importance is decisive for the other party's consent must disclose it, where the other party legitimately does not know that information or legitimately relies on its counterpart. This baseline rule applies to any sale of goods and sits underneath the more demanding duties that fall specifically on a professional seller.

The duty has clear limits written into the text. It does not extend to information about the value of the goods: a buyer is not obliged to reveal that it is paying below market, and the seller's silence on value alone does not breach the duty. The information must also be one the other party could not obtain for itself through ordinary diligence. The seller duty to inform France recognises is therefore about knowledge the buyer cannot reasonably reach on its own, not about doing the buyer's homework for it.

Article 1112-1 is a public-policy rule that the parties cannot contract out of or limit in advance. Where a duty of information is contested, it is for the party who claims the information was owed to prove it was decisive, and then for the party who owed it to prove it was provided. That allocation of the burden of proof, examined below, is often what decides a dispute over forming a valid contract of sale.

The professional seller's reinforced duty to advise (devoir de conseil)

On top of the general duty to disclose, French courts impose on a professional seller a reinforced duty to advise — the devoir de conseil. A professional seller must find out about the buyer's needs and then advise the buyer on the conditions in which the goods should be used and on what the goods are and are not capable of doing. The duty is active, not passive: the seller must ask the right questions before it can give the right advice.

The courts apply this duty strictly. A seller is not released from it merely because the buyer arrives accompanied by the installer of the equipment, nor by inserting into its documents a clause telling the buyer to take advice from other professionals. Where the seller hands over a quotation, it must state the elements of that quotation correctly — including, for example, a forecast of a tax credit tied to the installation — and it is liable if an erroneous figure was decisive for the buyer's consent.

This devoir de conseil is a cornerstone of the seller duty to inform France applies to business sellers. It converts the seller from a passive supplier into an adviser who must engage with what the buyer is trying to achieve, and it is the duty most often litigated when a buyer complains that goods it bought turned out to be unsuited to the job.

The duty to warn about a product's limits and suitability

The advice a seller owes is not generic. It must be tailored to the use the buyer has in mind, which is why the duty begins with the seller inquiring into that use. Once the seller understands the intended application, it must warn the buyer of any limits, constraints or unsuitability of the goods for that application — for instance that a material will not withstand the conditions the buyer plans to expose it to, or that software will not perform a function the buyer assumes it will.

The reach of the duty can even run past the immediate buyer. Where a seller supplies a professional intermediary while knowing that its goods form part of a larger order destined for a non-professional end user, the courts have held that it remains bound by its duty to advise towards that final user. A seller cannot always shelter behind the fact that it dealt only with a trade counterparty.

The buyer is not passive either. The buyer must ask its seller for information and must specify the use it intends where that use is not the usual one; a buyer is entitled to demand advice where the goods are highly elaborate. But the buyer's own duty of care reduces, without removing, the seller's obligation, and the two are weighed against each other when responsibility is shared after a failed purchase.

How the scope varies with the buyer's own competence

The single most important variable in fixing the scope of the duty is the buyer's own competence. Between a professional seller and a consumer or an inexpert buyer, the duty is at its fullest. Between two professionals it narrows, because a competent buyer is expected to understand the goods it habitually deals in and cannot complain of not being told what it already knew or should have known.

That narrowing is not an escape hatch. The courts have repeatedly held that a professional seller is not discharged from its duty where the buyer, even though a professional, lacks the competence to form its own view of the conditions of use of the goods. A professional buyer is entitled to the information held by the seller precisely to the extent that its own expertise does not give it the means to appreciate the exact scope of the technical characteristics of the product sold.

This graduated approach means the seller duty to inform France enforces cannot be assessed in the abstract. It depends on who the buyer is, what the buyer told the seller about its intended use, and whether the buyer had the technical means to protect itself. A professional buyer, in turn, is expected to set out clearly in the contractual documents the qualities or specifications it expects of the product it orders.

Overlap with the warranty of conformity and hidden defects

The duty to inform and advise is distinct from the seller's warranties, but it overlaps with them and is frequently pleaded alongside them. A buyer who receives goods that do not match the contract may sue for non-conforming delivery; a buyer who receives goods with a latent flaw may bring the warranty against hidden defects claim. The duty to advise is a separate, fault-based route that targets the failure to warn rather than the state of the goods.

The distinction has practical bite on proof. The courts have held that where a buyer cannot prove any non-conformity of the goods, it cannot then invoke a breach of the seller's duty to advise about the conformity of what was delivered. The duty to advise cannot be used to reconstruct a warranty claim that the buyer has failed to establish on its own terms.

Where a seller has actively concealed a defect, the two regimes converge in the buyer's favour. Fraudulent concealment of a hidden defect — the seller's réticence dolosive — makes an action to void the sale for the seller's fraud admissible, in parallel with the ordinary hidden-defects remedy. The buyer is then not confined to the warranty; it can attack the very formation of the sale.

Sanctions — nullity for fraudulent concealment (dol) and damages

Breach of the duty carries two possible sanctions, depending on the seller's state of mind. Where the seller was merely negligent — it failed to inform or advise but did not act deceitfully — the sanction is liability in damages to compensate the loss the buyer suffered because it was not properly informed. This is the ordinary consequence of a breached devoir de conseil.

Where the seller went further and deliberately withheld decisive information, the conduct becomes dol. Article 1137 of the Civil Code treats the intentional concealment by one party of information it knew to be decisive for the other as fraud, placing deliberate silence — réticence dolosive — on the same footing as a positive lie. Article 1130 provides that fraud, like error, vitiates consent where it is of such a nature that, without it, the party would not have contracted or would have contracted on materially different terms.

The practical significance is that the same failure can trigger very different exposure. A seller that simply forgot to warn faces a claim for the buyer's loss. A seller that knew of a problem and stayed silent to close the deal faces the unwinding of the whole transaction, with restitution of the price, plus compensation. This is why the seller duty to inform France imposes should never be treated as a formality.

Evidence: who must prove the information was given

The burden of proof is often decisive, and French law places it firmly on the seller. It is for the seller to prove that it discharged its duty to advise — the duty that requires it to inform itself of the buyer's needs so as to be able to advise on whether the goods proposed suit the intended use. A seller that cannot produce evidence of the advice it says it gave will usually lose, even if it did in fact give that advice.

This reversal matters because the information is exchanged orally in most sales. A seller who relies on a spoken conversation with no written trace carries the risk that the conversation cannot later be proved. The buyer, for its part, must still prove that the information not given was decisive and that it legitimately did not have it — but once that threshold is crossed, the seller must show it complied.

For the buyer, the mirror-image lesson is to put its intended use in writing. A professional buyer is expected to make clear, in the contractual documents, the qualities and specifications it requires of the product it orders. A buyer that fails to state an unusual use may find responsibility shared against it, reducing what it can recover from the seller.

Drafting and process to manage the seller duty to inform

Because the duty cannot be excluded and the seller carries the burden of proof, the answer is process, not disclaimers. A seller that builds documentation of the advice it gives into its ordinary sales workflow controls its exposure far better than one that relies on a limitation clause the courts may set aside. The steps below convert the case law into a practical routine for a professional seller of goods.

Followed consistently, this process does two things at once: it improves the advice the buyer receives, and it produces the evidence the seller will need if the sale is later challenged. It is the most reliable way to manage the seller duty to inform France places on professional sellers of goods and equipment.

Frequently asked questions about the seller duty to inform in France

Does a French seller have to advise the buyer?

A professional seller does. On top of the general pre-contractual duty to disclose decisive information under Article 1112-1 of the Civil Code, French courts impose a duty to advise (devoir de conseil): the seller must find out the buyer's intended use and advise on whether the goods suit it. The duty is strongest towards a consumer or a buyer who lacks the expertise to judge the goods.

What is the devoir de conseil?

It is the reinforced duty of a professional seller to advise the buyer on the conditions of use of the goods and on their suitability for the buyer's purpose. It requires the seller to inform itself of the buyer's needs first, then give tailored advice. It goes beyond simply handing over a working product.

What happens if the seller hid information?

Deliberate concealment of decisive information is dol (fraud) under Article 1137 of the Civil Code, and Article 1130 provides that fraud vitiates consent. The buyer can ask the court to annul the sale, with restitution of the price, and can also claim damages. A merely negligent failure to advise, by contrast, leads only to damages.

Who must prove the information was given?

The seller. French law places the burden on the professional seller to prove it discharged its duty to advise. Because much advice is given orally, a seller that keeps no written record risks being unable to prove compliance, even where it did advise the buyer.

Does the duty apply between businesses?

Yes, but its scope varies with the buyer's competence. Between professionals of the same speciality the duty narrows, because the buyer is presumed able to appreciate the goods. It remains fully owed where a professional buyer lacks the competence to assess the technical characteristics or conditions of use itself.

Can the seller exclude the duty by contract?

No. The general duty to inform under Article 1112-1 is a public-policy rule that cannot be limited in advance, and a seller cannot discharge its duty to advise simply by telling the buyer to consult other professionals. The practical protection is documentation, not a disclaimer clause.

How does the duty relate to the hidden-defects warranty?

They are distinct but overlap. The duty to advise is a fault-based failure to warn, while the hidden-defects warranty targets a latent flaw in the goods. Where a buyer cannot prove any non-conformity, it cannot use the duty to advise to reconstruct a failed warranty claim; but where the seller fraudulently concealed a defect, the buyer can also sue to void the sale for dol.

Key takeaways on the seller duty to inform in France

How our French lawyers help with the seller duty to inform

Petroff Avocats advises both sides of this issue. For sellers and suppliers selling into France, we build compliant sales processes — needs questionnaires, specifications, written warnings and terms — that discharge the duty to inform and advise and create the evidence you will need if a sale is challenged. For buyers, we assess whether a seller failed to warn you about goods that proved unsuited to your use, and we pursue damages or annulment for fraudulent concealment where the facts support it. In every case we translate the French case law on the devoir de conseil into a clear strategy for your position.

This article is for general information only. It does not constitute legal advice and does not create a lawyer-client relationship. The law and its application to specific facts can change and vary from case to case. Contact our French lawyers for advice on your situation.