Two Overlapping Legal Layers
French law approaches the vulnerability of adults through two distinct but cumulative legal layers. The first is general law: any act passed by any person who lacked sound mind at the moment of conclusion can be attacked for trouble mental under Articles 414-1 and 414-2 of the Civil Code — regardless of whether the person was under any protective measure. The second layer consists of the specific regimes attached to each protective measure, which operate in parallel and provide additional or alternative grounds of challenge tailored to the degree of incapacity that each measure implies.
These two layers do not exclude one another. An act passed by a person under curatelle with their curateur's assistance — formally impeccable under the curatelle rules — can still be challenged for trouble mental if the person lacked sound mind at the time (Cass. 1ère civ. 15-1-2020 n° 18-26.683 FS-PBI). A practitioner advising on a transaction involving a potentially vulnerable counterparty must analyse both layers independently.
Action for trouble mental: proof of mental disorder at moment of act. Claimant bears the burden. Five-year prescription from the act.
Simplified challenge: prove the incapacity was notorious or known to the counterparty. Reduction if prejudice not proven; annulation if prejudice shown.
Sauvegarde: rescission for lésion or reduction for excess. Curatelle: voidable on prejudice (person); null de plein droit (curateur in excess). Tutelle: null de plein droit (person without representation). Habilitation: null de plein droit (person for covered acts).
Even where a measure is in place and its specific regime applies, the general trouble mental action under Art. 414-1 remains available if its conditions are independently satisfied.
The General-Law Action: Nullity for Mental Disorder
Article 414-1 of the Civil Code states the foundational rule: to make a valid legal act a person must be of sound mind. Any act passed in a state of mental disorder can be annulled. This action applies to everyone — whether or not under a protective measure, and regardless of whether the act was preceded by any court proceeding.
Who Can Bring the Action While the Person Is Alive
During the person's lifetime, only the person themselves can bring the action — or, if a tutelle or curatelle has subsequently been opened, their tuteur or curateur on their behalf (C. civ. Art. 414-2 al. 1). Prior court authorisation for the act in question provides no immunity against this action. A sale of a protected person's home authorised by the juge des tutelles was annulled because the person was not of sound mind at the moment they signed the preliminary sale agreement — the court's authorisation of the transaction did not cure the person's incapacity at the moment of their consent (Cass. 1ère civ. 20-10-2010 n° 09-13.635 FS-PBI).
After Death: The Three Gates for Heirs
After the person's death the action is restricted. Heirs can bring it only if one of three conditions is met (C. civ. Art. 414-2 al. 2):
- The act itself carried intrinsic evidence of mental disorder — such as a sale at a derisory price, a lease at an abnormally low rent, or terms so irrational as to speak for themselves.
- The act was passed while the person was under sauvegarde de justice — in which case heirs can bring the action freely without needing the act to bear intrinsic evidence of disorder.
- A proceeding to open a tutelle, curatelle, or habilitation familiale was already under way before the person's death. The fact that a person was under curatelle at the time of the contested act does not by itself prove unsoundness of mind — the heirs must still establish the disorder independently (Cass. 1ère civ. 14-3-2018 n° 17-15.406 F-D).
These restrictions do not apply to libéralités — donations and testamentary dispositions — whose nullity heirs can always seek on proof of mental disorder alone, without needing to satisfy any of the three conditions (C. civ. Art. 901). A universal legatee has standing to bring the action in nullity of a sale made by the testator while of unsound mind (Cass. 1ère civ. 8-7-2015 n° 14-17.768 F-PB).
Burden of Proof and Evidence
The burden of proving the mental disorder at the moment of the act lies with the claimant — it is not presumed (C. civ. Art. 414-1 al. 1). Proof is by any means. Where the act appears formally normal, external evidence remains admissible: medical expert reports, witness testimony, medical records from the period, prior and subsequent behaviour.
Prescription
The action prescribes in five years (C. civ. Art. 414-2 al. 3 and 2224). For a person who was not under protection, the period runs from the day of the act — subject to suspension where the person proves they were unable to act. Where heirs bring the action, the period runs from the day of death, provided it had not already begun to run before then (Cass. 1ère civ. 13-7-2016 n° 14-27.148 FS-PB).
The Two-Year Pre-Opening Window: Acts During the Période Suspecte
Acts carried out by the vulnerable person before a tutelle, curatelle, or habilitation familiale was opened are in principle valid. However, those accomplished less than two years before the publication of the opening judgment benefit from a simplified challenge regime that lowers the evidential threshold below that of the general action for trouble mental (C. civ. Art. 464 al. 1).
What Must Be Proved
To challenge an act in the two-year window, the claimant must prove that the person's inability to defend their own interests — due to the alteration of their faculties — was either notorious (widely known in the person's environment before the act was concluded) or known to the counterparty (the specific person transacting with the vulnerable person knew of the impairment at the time). This is a significantly lower bar than proving mental disorder at the moment of the act, and it specifically targets the person on the other side of the transaction.
The Two Possible Outcomes
- If only notoriety or knowledge of impairment is proved, the obligations arising from the act can be reduced to remove the disproportionate element — without requiring proof of financial harm to the person.
- If it is additionally shown that the person suffered actual prejudice, the act itself can be annulled.
Prescription for Pre-Opening Acts
The action for reduction or annulation of acts in the two-year window must be brought within five years of the date the protective measure was opened (C. civ. Art. 464 al. 3). After the person's death, their heirs may exercise the action in the same period. The contested act may be confirmed — with judicial authorisation — at any point within the five-year period while the habilitation remains in force.
For any transaction concluded with an elderly or cognitively declining person in the two years before a protective measure is opened, the other party's knowledge of the impairment becomes a central transactional risk. A bank, notaire, or property agent who proceeded with the transaction despite knowing of the person's difficulties cannot invoke the apparent regularity of the act as a defence. Diligence and documentation of the person's capacity at the time of every significant transaction are not merely good practice; they are a legal protection against an action that can arise up to five years after the protective measure opens.
Acts After the Opening of a Sauvegarde de Justice
Because a sauvegarde de justice does not restrict the person's legal capacity — they retain full capacity throughout — acts they carry out after it opens are in principle valid regardless of their nature (C. civ. Art. 435 al. 1). What changes is the ease with which those acts can subsequently be challenged.
Rescission for Financial Prejudice
Any act passed by a person under sauvegarde de justice can be rescinded if the person suffered a financial prejudice, whatever its magnitude (C. civ. Art. 435 al. 2 and 2920). Only the person themselves has standing during their lifetime — or their heirs after death. The financial prejudice must be assessed at the time the contract was concluded — not retrospectively.
Reduction of Excessive Commitments
Where an act passed under sauvegarde is not prejudicial in the sense of financial loss but is nonetheless useless or disproportionate to the person's needs or resources, it can be reduced — brought down to a reasonable level — rather than annulled in full (C. civ. Art. 435 al. 2). Where the subject of the act is indivisible, reduction can only be achieved by annulment.
Prescription Under Sauvegarde
Actions for nullity, rescission, or reduction must be brought within five years. The period does not run against the person until they have knowledge of the act and are in a position to act on it validly. The absolute long-stop is 20 years from the date of the act under Article 2232 of the Civil Code. Heirs of a person who was under sauvegarde at the time of the contested act benefit from more favourable access to the general trouble mental action — they are not required to show that the act bore intrinsic evidence of mental disorder.
Acts After the Opening of a Tutelle
The tutelle creates a differentiated system of sanctions depending on who committed the irregular act and what rule they violated (C. civ. Art. 465).
Act by the Protected Person Where Representation Was Required
Where the protected person acts alone on a matter for which they should have been represented by their tuteur, the act is NULL DE PLEIN DROIT — automatically void in law, with no need to prove that the person suffered any prejudice (C. civ. Art. 465 3°). However, "null de plein droit" does not mean the nullity is self-executing: it must still be requested from a court by a person with standing to do so. An action brought by a person without standing — such as the spouse who is not the tuteur — will be declared inadmissible (Cass. 1ère civ. 5-3-2014 n° 12-29.974 F-PB).
Act by the Protected Person Where Assistance Was Required
Where the protected person acts alone on a matter for which they required the tuteur's assistance (rather than full representation), the act is VOIDABLE — it can be annulled only if the person suffered prejudice (C. civ. Art. 465 2°).
Act by the Protected Person Within Their Autonomous Capacity
Where the person acts alone on a matter they had the power to handle independently, the act is valid — but it can still be rescinded for lésion or reduced for excess by reference to the sauvegarde de justice regime, unless it had been expressly authorised by the juge des tutelles or the conseil de famille (C. civ. Art. 465 1°).
Act by the Tuteur in Excess of Powers
Where the tuteur acts alone on a matter that required the protected person's own act (with or without assistance), or that required judicial authorisation which was not obtained, the act is NULL DE PLEIN DROIT (C. civ. Art. 465 4°). It can be confirmed within five years with the authorisation of the juge des tutelles or conseil de famille.
Restitutions on Annulment
Where an act is annulled, the restitution obligations owed by the protected person are reduced in proportion to the benefit the person actually derived from the annulled act (C. civ. Art. 1352-4). This protection ensures that a retroactive unwinding of the transaction does not itself harm the protected person by requiring them to repay more than they received.
Who Can Bring the Action Under Tutelle
The action can be brought by the tuteur with the authorisation of the juge des tutelles or conseil de famille, by the person themselves if they have recovered capacity, or by their heirs after death (C. civ. Art. 465 al. 7). The five-year prescription applies in all cases.
Acts After the Opening of a Curatelle
Act by the Protected Person Without Required Assistance
Where a person under curatelle acts alone on a matter for which the curateur's assistance was required, the act is VOIDABLE — but not void automatically. The court can annul it only if the person suffered prejudice (C. civ. Art. 465 2°). The curateur can bring the nullity action alone with the juge des tutelles' authorisation. The five-year prescription applies.
Conservation and Administration Acts Under Curatelle
Acts of conservation and administration carried out by the protected person are in principle valid even under curatelle — the curatelle restricts only the major acts requiring assistance. However, such acts remain subject to the general trouble mental action if the person lacked sound mind at the time (C. civ. Art. 466). They can also be rescinded or reduced under the same conditions as sauvegarde de justice acts, unless expressly authorised by the court.
Act by the Curateur in Excess of Powers
Where the curateur acts in the protected person's place — carrying out an act the person should have done alone or with assistance, or that required judicial authorisation — the act is NULL DE PLEIN DROIT without needing to show prejudice (C. civ. Art. 465 4°). This is a relative nullity: the action must be brought by the person assisted by their curateur (or by the person alone after the measure ends, or by their heirs after death). An action brought by a third party — the person's spouse who was not the curateur — is inadmissible (Cass. 1ère civ. 5-3-2014 n° 12-29.974 F-PB).
Acts After the Opening of a Habilitation Familiale
Act by the Protected Person on a Covered Matter
Where the protected person acts alone on a matter whose accomplishment has been entrusted to the habilitated person, the act is NULL DE PLEIN DROIT — regardless of any prejudice — mirroring the tutelle regime for representation (C. civ. Art. 494-9 al. 1). However, the counterparty may oppose the nullity action by invoking the utility of the act: if the act was genuinely useful to the protected person, the court has the flexibility to refuse annulment on that basis (C. civ. Art. 1151 al. 1).
Act by the Protected Person Where Assistance Was Required
Where the protected person acts alone on a matter requiring the habilitated person's assistance, annulment is available only on proof of prejudice (C. civ. Art. 494-9 al. 2) — mirroring the curatelle regime for acts done without the curateur's assistance.
Act by the Habilitated Person in Excess of Powers
Where the habilitated person carries out an act that exceeds the scope of their habilitation, or that required the juge des tutelles' authorisation which was not obtained, the act is NULL DE PLEIN DROIT (C. civ. Art. 494-9 al. 5). The deferred running of the prescription applies.
Prescription and Confirmation Under Habilitation
All actions under the habilitation regime prescribe in five years (C. civ. Art. 494-9 al. 6). During that period, and while the habilitation remains in force, the contested act can be confirmed with the authorisation of the juge des tutelles — providing a pathway to cure irregularities prospectively rather than unwind completed transactions (C. civ. Art. 494-9 al. 7).
The Complete Challenge Framework at a Glance
| Situation | Act type | Outcome | Prejudice needed? | Who can act? | Prescription |
|---|---|---|---|---|---|
| No measure — general law | Any act | Nullity | No — but mental disorder at time of act must be proved | Person; after death: heirs (three-gate rule) | 5 years from act / death |
| Période suspecte (within 2 years pre-opening) | Any act | Reduction / Nullity | Reduction: no. Annulation: yes | Person; heirs after death; habilitated person (with court auth.) | 5 years from opening of measure |
| Sauvegarde — person acts | Any act | Rescission / Reduction | Rescission: yes (any amount). Reduction: no prejudice needed but excess required | Person; heirs after death | 5 years from act (deferred running rules apply) |
| Tutelle — person acts where representation required | Represented acts | Null de plein droit | No | Tuteur (court auth.); person recovered; heirs | 5 years (deferred) / 20-year long-stop |
| Tutelle — person acts where assistance required | Assisted acts | Voidable | Yes | Tuteur (court auth.); person recovered; heirs | 5 years (deferred) |
| Tutelle — tuteur acts in excess of powers | Unauthorised disposition | Null de plein droit | No | Person / heirs — not third parties (relative nullity) | 5 years; confirmation possible within 5 yrs |
| Curatelle — person acts without required assistance | Assisted acts | Voidable | Yes | Curateur (court auth.); person; heirs | 5 years |
| Curatelle — curateur acts in excess of powers | Acts beyond curateur's role | Null de plein droit | No | Person assisted by curateur; person after measure; heirs — not third parties | 5 years |
| Habilitation — person acts on covered matter (representation) | Covered representation acts | Null de plein droit | No (but counterparty may invoke utility) | Person; heirs after death | 5 years; confirmation with court auth. while measure runs |
| Habilitation — person acts where assistance needed | Covered assistance acts | Voidable | Yes | Person; heirs | 5 years |
| Habilitation — habilitated person acts in excess | Acts beyond habilitation scope | Null de plein droit | No | Person; heirs | 5 years (deferred); confirmation possible while measure runs |
Across all regimes, the phrase "null de plein droit" — null by operation of law — does not mean the act disappears without any court involvement. It means the nullity is established automatically if the conditions are met, but it must still be declared by a court in response to a request by a person with standing to bring it. A person without standing — for example, the spouse of the protected person who is not themselves the tuteur or curateur — will be found inadmissible. The relative character of the nullity means only the designated parties can invoke it.
Whether you need to assess the challenge risk on a completed transaction, advise a family on available remedies, or structure a future transaction to minimise exposure, our guides cover the full French adult protection law framework.
Book a ConsultationThis article is provided for general information and educational purposes only. It does not constitute legal advice. The challenge of acts passed by vulnerable persons raises complex questions of evidence, prescription, standing, and the interaction between different legal regimes that require detailed analysis of the specific facts and circumstances of each case. Always seek advice from a qualified French notary or lawyer.
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Key Legal References
Soundness of mind: requirement for valid legal acts; any act in state of mental disorder may be annulled
Who can bring trouble mental action: person during lifetime; tuteur/curateur; after death three gates for heirs (intrinsic evidence / sauvegarde / measure proceedings under way)
Libéralités: heirs can always challenge donations and testamentary dispositions on proof of mental disorder alone (no three-gate restriction)
Two-year pre-opening window (période suspecte): simplified challenge where impairment notorious or known to counterparty; reduction (no prejudice needed); annulation (prejudice required); 5-year prescription from opening
Sauvegarde de justice: person retains full capacity; rescission for financial prejudice (any amount); reduction for disproportionate acts; 5-year prescription; 20-year long-stop
Tutelle and curatelle differentiated sanctions: person acts without representation = null de plein droit; person acts without assistance = voidable on prejudice; person within autonomous capacity = rescission/reduction; tuteur/curateur in excess = null de plein droit
Conservation and administration acts under curatelle: remain subject to general trouble mental action and rescission/reduction as for sauvegarde
Habilitation familiale: person acts on covered matter (representation) = null de plein droit (utility defence available); person acts without required assistance = voidable on prejudice; habilitated person in excess = null de plein droit; 5-year prescription; confirmation with court auth.
Utility defence: counterparty may oppose nullity where act was genuinely useful to protected person
Reduced restitutions on annulment: protected person’s restitution obligations reduced in proportion to benefit derived from annulled act
5-year prescription; deferred running against person until knowledge and capacity; against heirs from death if not previously running
20-year absolute long-stop from date of act
Prior court authorisation does not immunise act against trouble mental action: sale authorised by juge des tutelles annulled because person lacked sound mind at moment of signing
Curatelle at time of act does not by itself prove unsoundness of mind: heirs must still establish mental disorder independently
Null de plein droit is relative nullity: only designated parties with standing may invoke it; action by spouse who is not tuteur/curateur is inadmissible
Heirs’ prescription for trouble mental action runs from death if not previously running from date of act
