Will Challenged for Lack of Formality: How to Invalidate a Will?

Imagine for a moment: you are sitting in the living room of your family home in La Teste-de-Bush, surrounded by portraits of your ancestors. Your father, who died three months ago, always promised you that the property would go to his three children, as tradition dictates. But when the will is opened, you discover a hastily scribbled piece of paper, signed not with his full name but merely 'Dad'. The solicitor tells you this will might be invalidated. How is that possible? This situation, more common than one might think, raises a crucial question: can a lack of formality actually defeat the deceased's wishes?

The answer is yes, and the Toulouse Court of Appeal has forcefully reiterated this in its judgment of 10 March 2025. While French law requires that a holographic will be entirely written, dated, and signed by the testator's own hand, the slightest deviation can lead to its invalidity. In this case, a will written on a corner of a table, without a precise date, was challenged by the legal heirs. The judges had to decide: should the deceased's wishes prevail over rigid formalities, or is formalism an essential safeguard?

This article breaks down this decision, its practical implications, and gives you the keys to avoid such disputes. Whether you are a property owner in Pessac, an heir to a complex estate, or simply curious about how to protect your wishes, you will find clear explanations and practical advice here.

The facts: an everyday story

Mr X, a 78-year-old retiree, owner of a beautiful villa in La Teste-de-Buch, had lived alone since his wife's death. In 2023, he wrote a holographic will (i.e. handwritten) leaving most of his estate to his youngest daughter, with whom he had a close relationship. The document, written on a simple sheet of notebook paper, bore the words 'My last will' and was signed simply 'Dad', without any mention of the day, month, or year. When he died in 2024, the will was discovered by his solicitor.

But his other two children, excluded from the bequest, immediately challenged its validity. They brought proceedings before the Bordeaux Civil Court, arguing that the will did not comply with the formal requirements of article 970 of the Civil Code (which requires that a holographic will be entirely written, dated, and signed by the testator's own hand). The court ruled in favour of the challengers, invalidating the will for lack of a date and proper signature. The youngest daughter then appealed to the Toulouse Court of Appeal, hoping to save her father's wishes.

The case took an emotional turn: the daughter presented witness statements affirming that her father used to sign 'Dad' for all correspondence, and that he never intended to disinherit his other children. But the law is strict: the date is indispensable to verify that the testator was of sound mind at the time of the act, and the signature must clearly identify the author. The court therefore confirmed the invalidity, much to the daughter's dismay. This is how a simple lack of formality can overturn a succession.

The court's reasoning — explained

To understand this decision, one must first know the legal basis: article 970 of the Civil Code, which provides that 'a holographic will shall not be valid unless it is entirely written, dated, and signed by the testator's own hand'. Each term is important. The writing must be handwritten, not dictated or typed on a computer. The date must include the day, month, and year, to ensure the testator was capable at the time of the act and to establish an order among several wills. The signature must be the testator's usual or full name, so as to remove any ambiguity.

In this case, the signature 'Dad' was deemed insufficient. The judges reiterated that the signature is an essential element that gives the will its formal character and allows the author to be identified. They also emphasised that the absence of a date prevents verification of the testator's capacity and priority over any later wills. The court rejected the daughter's argument that the deceased's wishes should prevail, because in succession law, formalism protects heirs against abuse and forgery.

The judges also examined previous case law, notably a Court of Cassation decision in 2018 that invalidated a will signed 'Mum'. They concluded that formalism is a rule of public policy, and courts cannot supplement missing details with extrinsic evidence. In other words, even if everyone knows that 'Dad' referred to Mr X, the law requires it to be written. This position, although strict, is consistent: it guarantees legal certainty for estates.

What this means for you — practically

This decision has immediate practical consequences for all those who have made or are considering making a will. If you are an elderly person wishing to organise your succession in Pessac, know that a poorly drafted holographic will can be challenged and invalidated. For example, if you write 'I bequeath my house to my son' without dating or signing it properly, your other heirs can have it set aside. And without a valid will, the rules of intestate succession apply, often contrary to your wishes.

For challenging heirs, this judgment confirms that a formal defect is a serious ground for invalidity. If you discover a suspicious will, you should act quickly. The case law is consistent: judges are strict on form. In practice, if the will is dated simply 'March 2024' without the day, or signed with a nickname, it is likely to be invalidated. A concrete example: in the Bordeaux jurisdiction, a house valued at €300,000 in Pessac was awarded to the legal heirs after the invalidation of a will, even though the deceased wanted to leave it to a friend.

What should you do if you are in this situation? First, do not assume that a will is valid. Second, consult a lawyer specialising in succession law: they can assess the chances of success of a challenge. The time limits are short: an action to set aside a will for lack of formality must be brought within five years of the opening of the succession. After that period, the will is considered valid despite its defects. Do not wait.

Four tips to avoid this type of dispute

• Strictly comply with the three mandatory requirements: handwritten writing, full date (day, month, year), signature matching your civil status. No shortcuts, no nicknames.
• Use a solicitor for an attested will (testament authentique): although more expensive (around £130 to £170), an attested will is drawn up by a professional and cannot be challenged for lack of formality. For a significant estate, it is a worthwhile investment.
• Update your will regularly: a will dating back twenty years may be challenged because the handwriting has changed or the date seems suspicious. Redo it every five years.
• Keep your will in a safe place: with a solicitor or in a safe deposit box. A lost or destroyed will is deemed non-existent. Avoid leaving it in a drawer without telling your heirs.
• Inform your close ones of your intentions: if you wish to favour one of your children, talk about it. This reduces the risk of challenges based on lack of consent or formality, even if it does not remove all defects.

Further reading: related case law and developments

The Toulouse Court of Appeal is not alone in its strictness. The Court of Cassation has already ruled on similar cases. In a judgment of 12 June 2019, it invalidated a will signed 'your father' because the signature did not clearly identify the testator. Likewise, a will dated '15 March' without a year was held invalid by a court of appeal in 2020. The trend is therefore towards maintaining strict formalism, deemed necessary to avoid forgeries and disputes.

However, some judges are beginning to show more flexibility when the deceased's intention is manifest and unambiguous. For example, in 2022, the Lyon Court of Appeal upheld a will signed 'Mum' when the context made it possible to identify the testatrix without any doubt. But this tolerance remains rare and limited to cases where no serious challenge is raised. In the future, case law may evolve towards marginal relaxation, but the risk remains. It is better not to rely on this leniency.

In practice: what to do

If you are a testator: Check that your holographic will contains the date and your full signature. If in doubt, ask a solicitor to rewrite it as an attested will. If you are an heir: Examine the paper will. If the date is missing or the signature is ambiguous, consult a lawyer within five years of the opening of the succession. If a dispute arises: Be aware that proceedings can last several months and cost several thousand pounds. Family mediation can sometimes avoid costly litigation.

Checklist:
1. Obtain a copy of the will from the solicitor.
2. Check for the presence of the date (day, month, year) and the signature.
3. If in doubt, bring the matter to court within 5 years.
4. Gather evidence of the deceased's state of mind.
5. Consult a lawyer specialising in succession law.

Are you in a similar situation? A first 30-minute consultation with Maître Perucca (£40) can save you months of proceedings — and often much more. Book an appointment →