Yes, a British stepchild can receive assets from a French estate after Brexit, but a family relationship alone does not make that person a French legal heir. In this context, the French word succession covers the estate and the legal process following death. The result turns on the deceased’s family status, the existence and wording of a will, any adoption order, the law governing the international estate, and the tax classification used by the French tax authority. Brexit does not convert a stepchild into the child of a stepparent and does not remove the need to prove the beneficiary’s identity and entitlement. For a British family living in France, the practical route is to separate four questions. Does the stepchild inherit automatically? Can the stepparent leave a valid legacy without damaging the protected share of biological children? Would French adoption simple, meaning simple adoption that adds a legal parent-child relationship without erasing the original one, change the civil and tax analysis? Finally, which documents, deadlines and remedies apply when the estate includes French property, bank accounts, pensions or assets in the United Kingdom? The answers below use the law and official decisions checked for this article and are intended to help a family prepare the right file for a French notaire, the civil-law legal professional who settles the estate.
I. Can a British stepchild inherit a French estate after Brexit?
A. Does a stepchild inherit automatically without a will?
A stepchild is normally described in French as a beau-enfant or an enfant du conjoint. Those expressions describe a family reality; they do not, by themselves, establish a legal line of descent. If the deceased was the stepparent and never adopted the British child, the child is not automatically called to the stepparent’s estate merely because the couple were married, lived together, or raised the child in the same household.
The starting point is the French Civil Code. Its intestacy rules, meaning the rules that apply when there is no effective testamentary disposition, organise the family into orders. Article 734 of the Civil Code places children and their descendants in the first order where there is no surviving spouse. Article 735 of the Civil Code confirms that children or their descendants succeed their parents and other ascendants, without distinction based on sex, birth order or the fact that they come from different unions. A spouse is separately called under the rules applicable to the surviving spouse, but a spouse’s child is not thereby inserted into the stepparent’s order of heirs.
This distinction matters in a common family structure. Assume that a British mother marries a French resident who owns a French bank account and a house. Her adult son remains her son, not the husband’s son, unless a legal adoption has taken place. If the husband dies intestate, the son does not sign the acte de notoriété as an heir simply because he was the husband’s stepson. An acte de notoriété is a notarial deed used to establish the identity and status of the people entitled to inherit. The surviving wife may inherit under the French rules, and the wife’s later death may transmit what she received to her own son, but that two-stage route is different from an immediate right against the stepparent’s estate.
The surviving spouse’s position can also change the amount available for a stepchild. Under Article 757 of the Civil Code, where the deceased leaves children or descendants, the surviving spouse may in the situations described by that provision choose between usufruct of the existing assets and ownership of a quarter. Usufruit means the right to use an asset or receive its income while another person holds the underlying ownership. The Cour de cassation stated the rule in its decision of 5 March 2025, no. 23-11.430, available on the official Cour de cassation decision page:
Selon ce texte, si l’époux prédécédé laisse un ou plusieurs enfants qui ne sont pas issus des deux époux, le conjoint survivant recueille la propriété du quart des biens existants.
That decision concerned the rights of the spouse, not a direct inheritance right for a stepchild. It nevertheless illustrates why a family should identify every legal child and the matrimonial status before calculating what can be left to another beneficiary. A British child of the surviving spouse may receive assets indirectly later, but a French notary cannot treat that child as a direct descendant of the stepparent without a legal basis.
Brexit does not alter that family classification. A British passport, a former EU residence card, a French long-stay visa, or years spent in the same French home does not create filiation. It is also unsafe to assume that the English word “child” in an English will has the same legal reach in France as the French expression enfant. The will must be interpreted with the governing law, the family evidence and the form of the gift in mind.
There is one further cross-border question: which law governs the whole succession? The European e-Justice information for France explains that, for successions opened from 17 August 2015, the general connecting factor is the deceased’s habitual residence at death, while a person can choose the law of their nationality for the succession as a whole. The European e-Justice guidance on the applicable law is useful for the framework, but a British national’s will still needs careful drafting because the United Kingdom is outside the EU succession regulation and because French proceedings, French assets and French tax rules may remain involved.
A choice of English or Scottish law may affect succession rights and the calculation of protected shares, but it does not automatically settle the tax bill. Nor does it necessarily remove a French notary from the practical process where French immovable property, a French bank, or land-registration formalities are involved. A clause choosing the law of nationality should be explicit, coordinated with any earlier will, and checked against the family’s actual nationalities and habitual residences at the date of death.
B. Can a French will or adoption secure the inheritance?
A will can make the stepchild a légataire, meaning a person named to receive a gift on death. That is the usual civil-law mechanism when a stepparent wants to benefit a child who has not been adopted. The will can identify a fixed sum, a particular asset, a percentage, or the remainder of the estate, subject to the rights of protected heirs and to the rules governing the form and validity of the will.
The limit is the French réserve héréditaire, or protected share. Article 912 of the Civil Code defines that protected share as the part of the estate which the law guarantees to certain heirs if they are called to the succession and accept it. The same article defines the quotité disponible as the part which is not reserved and which the deceased may freely give away. A stepchild is not protected merely as a stepchild. The stepparent can usually use the disposable part for that child, but the size of that part depends on the deceased’s own descendants and, in some cases, a surviving spouse.
Article 913 of the Civil Code fixes the principal proportions: the disposable part is one half where the deceased leaves one child, one third where there are two children, and one quarter where there are three or more. Those fractions concern the entire estate after the relevant assets, gifts and liabilities have been identified, not simply the balance in one French account. A will giving the stepchild the disposable part can therefore be effective while still leaving the protected share to the deceased’s biological or legally adopted children.
If there are no descendants, the position of a surviving spouse must also be checked. Article 914-1 of the Civil Code limits gifts and testamentary dispositions to three quarters where, in the absence of a descendant, the deceased leaves a surviving spouse who is not divorced. In a family with no children of the deceased but a married surviving spouse, the stepchild cannot assume that a will may give away every asset. The notary must test the proposed legacy against the spouse’s protected quarter and any matrimonial rights.
A challenge is not theoretical. When a gift exceeds the disposable part, a protected heir can seek réduction, meaning reduction of the excessive gift to restore the protected share. Article 921 of the Civil Code provides a five-year period from the opening of the succession, or two years from the date on which the heirs knew of the infringement, with an absolute ten-year limit from death. The notary must inform each known protected heir where the reserved rights may have been affected. A stepchild named in a will should preserve the original testament, the estate valuations and the correspondence showing how the disposable part was calculated.
Adoption is a different route because it changes civil status rather than merely naming a beneficiary. French adoption simple adds a legal filiation while leaving the original family connection in place. Article 360 of the Civil Code states:
L’adoption simple confère à l’adopté une filiation qui s’ajoute à sa filiation d’origine selon les modalités prévues au présent chapitre.
For a British adult stepchild, this may provide a route to inherit from the adopting stepparent under the civil rules applicable to an adopted child, while preserving the relationship with the biological family. It is not a paper exercise. The court examines the statutory conditions and the child’s consent where required. Article 345-1 of the Civil Code allows simple adoption regardless of the adopted person’s age. Article 370-1 provides a specific rule for adoption of the child of the other member of the couple:
L’adoption de l’enfant de l’autre membre du couple n’est pas subordonnée à une condition d’âge de l’adoptant.
The age exception concerns the age of the adopting spouse or partner; it does not mean that every adult stepchild is adopted automatically. Article 370-1-1 of the Civil Code ordinarily requires the adopter to be ten years older than the child, although the court may depart from the difference where there are just reasons. The court also considers the precise relationship, the consent and, when relevant, the effect on the adopter’s existing family.
The procedure is judicial. Under Article 353-1 of the Civil Code, the adoption is requested by the adopter or adopters and the tribunal judiciaire, the ordinary civil court, checks within six months from being seized whether the legal conditions are satisfied and whether the adoption serves the child’s interests. The Nanterre court’s judgment of 21 October 2025, no. 24/09472, available through the official Cour de cassation database page, records the operative legal framework:
Aux termes de l’article 345-1 du code civil, l’adoption simple est permise quel que soit l’âge de l’adopté.
The same judgment records a simple adoption order after examining the applicable provisions. A first-instance decision is an example of how the provisions are applied, not a substitute for checking the present law and the family’s facts. Adoption also has durable consequences for names, family obligations, future estates and the position of other descendants. It should not be selected solely as a tax shortcut.
The distinction between an adopted child and a named stepchild is especially important at the tax stage. Civil inheritance status and inheritance tax status are related but not identical. A will may give the stepchild a claim to an asset while leaving that child taxed as a non-parent. Simple adoption may create a civil filiation but still fall within the special tax rule for simple adoption unless a statutory exception is proved. That is why the will, the adoption judgment and the tax return must be reviewed together.
II. What inheritance tax, documents and remedies apply?
A. How much French inheritance tax will a British stepchild pay?
For a stepchild who has not been adopted, the common French tax classification is a beneficiary without a qualifying parent-child relationship with the deceased. The official impots.gouv.fr explanation of inheritance tax calculations describes a 1,594 euro allowance where no other personal allowance applies and a 60% rate for other beneficiaries. The governing texts should still be checked for the date of death and the exact transfer.
Article 788, IV of the General Tax Code provides the 1,594 euro allowance, where no other allowance applies, on each share in a succession. Article 777 of the General Tax Code places transfers between persons beyond the fourth degree and between non-relatives in the 60% band. A simple example shows the scale: if an unadopted stepchild receives a taxable net legacy of 100,000 euros and no different relief applies, the starting calculation is an allowance of 1,594 euros followed by the 60% rate on the taxable balance. The precise assessment may include debts, reliefs, life-insurance rules, prior gifts and treaty credits, so the example is not a final tax bill.
Do not apply the 100,000 euro child allowance merely because the beneficiary is called a “stepchild”. Article 779 of the General Tax Code reserves its first paragraph for the share of each ascendant and each child living or represented in the statutory circumstances. A beneficiary needs a legally recognised status that fits the provision. A will alone normally gives the stepchild a legacy; it does not rewrite the family relationship for tax.
Simple adoption needs a separate tax analysis. The current version of Article 786 of the General Tax Code, in force from 1 July 2026, begins with the rule that the relationship created by simple adoption is not taken into account for free-transfer tax. It then lists exceptions. One expressly concerns children from a first marriage of the adopter’s spouse. Other exceptions concern, among other situations, certain adopted minors, sustained care, children of people who died for France and some older adoption situations. The wording is fact-sensitive and should be applied as written on the date of the death or gift.
This recent version matters for a British family because the expression “child of the spouse” is not enough on its own. The notary and tax adviser must establish whether the beneficiary is the child from the spouse’s first marriage, whether the adoption was actually pronounced, whether the marriage and adoption documents match, and whether another exception is being relied upon. The result can be very different from the 60% non-parent rate, but it should never be promised before the statutory exception is documented.
An earlier decision shows why evidence and date control matter. In its judgment of 8 January 2026, no. 24/05782, the Tribunal judiciaire de Bobigny examined the application of Article 786 to an adopted child. The decision is accessible through the official Cour de cassation database page. Its reasoning states:
En application de l’article 786 du code général des impôts, lorsque la filiation résulte d’une adoption simple, l’enfant du défunt ne bénéficie du tarif des droits de mutation à titre gratuit en ligne directe que s’il a reçu de l’adoptant des secours et des soins non interrompus au titre d’une prise en charge continue et principale, pendant 5 ans s’il est mineur lors du décès, et, s’il est majeur lors du décès, pendant 5 ans dans sa minorité, ou 10 ans dans sa minorité et sa majorité
That January decision predates the current 1 July 2026 wording and concerned its own facts. It should not be copied mechanically into a current return, particularly where the first-marriage exception may be relevant. It does, however, make the practical point clearly: an adoption judgment by itself may not answer the tax question, and a family relying on care or support must retain contemporaneous evidence rather than reconstructing the history after death.
French tax can apply even where the beneficiary is British and lives in the United Kingdom. Article 750 ter of the General Tax Code covers French-situs assets where the deceased is not French tax resident and can also cover worldwide assets where the deceased or donor is tax resident in France under the conditions in that provision. Residence, asset location, the date of death and the beneficiary’s own situation must be mapped before the return is prepared.
The United Kingdom may also have a claim to inheritance tax. The GOV.UK guidance for someone living outside the United Kingdom explains the treatment of UK assets and points to double-taxation relief where the same assets are taxed in two countries. The GOV.UK guidance on long-term UK residence also records the post-6 April 2025 residence framework for overseas assets. A British executor should therefore identify UK property, accounts, pensions and any long-term residence history rather than assuming that a French declaration closes the UK analysis.
The UK government’s published France–UK double-taxation convention is relevant where the same transfer is taxed in both jurisdictions. Treaty relief is a mechanism for allocating or crediting tax; it is not a rule that turns a stepchild into a French heir, validates a defective will, or changes the protected-share calculation. The file should show which country taxed which asset, under which article or domestic rule, and how any credit or repayment was calculated.
Where the stepchild is left a French asset by will and the estate includes UK assets, the safest calculation has three columns: civil entitlement, French tax and UK tax. The civil column records whether the beneficiary is an heir, a legatee or an adopted child. The French column records the taxable share, allowance, rate and any relief under the General Tax Code. The UK column records the UK asset connection and any Inheritance Tax exposure. Only after those columns are complete should the family decide whether a correction, repayment claim or treaty credit is needed.
B. What documents and deadlines protect the claim?
The first document is the instrument that creates the claim. If the route is a will, obtain the complete original, not a photograph of one page. A French holographic will must satisfy French formal conditions; an English or Scottish will should be reviewed under the applicable conflict rules and presented with evidence of its execution and any later codicil. If there are several wills, list their dates and governing-law clauses. Do not let a family member distribute assets on the basis of an informal promise while the notary is still checking the testament.
If the route is adoption, obtain the final adoption judgment, any certificate of finality, the updated birth certificate, marriage or partnership records relevant to the stepparent, and the evidence showing the exact identity used in the British and French documents. The British birth certificate may show the biological parent but not the French adopting parent. The adoption judgment must bridge that gap. Where a UK document is used in France, ask the notary whether an apostille, a certified translation into French, or a particular form of civil-status copy is required.
Proof of filiation is not a matter of family photographs alone. In the Pontoise judgment of 27 January 2025, no. 20/03087, the Tribunal judiciaire referred to the evidence rule in Article 310-3. The decision is available on the official Cour de cassation database page and quotes the rule:
la filiation se prouve par l’acte de naissance de l’enfant, par l’acte de reconnaissance ou par l’acte de notoriété constatant la possession d’état
The corresponding Article 310-3 of the Civil Code identifies the birth record, recognition record and an acte de notoriété recording possession of status as forms of proof. Possession d’état means a consistent, public and peaceful set of facts showing that a person has been treated as a child and a family has treated the person as belonging to it. It may help in a contested filiation issue, but it does not replace a final adoption judgment where adoption is the claimed legal basis for the inheritance.
The notary’s proof document has its own legal framework. Article 730-1 of the Civil Code allows proof of heir status through an acte de notoriété drawn up by a notary at the request of one or more entitled persons. It must refer to the death certificate and list the supporting civil-status documents and any testamentary documents that may affect the distribution. If the stepchild is named in a will but not an heir by blood or adoption, the notary should record the person’s status as a legatee rather than silently treating the legacy as intestate inheritance.
A British executor should prepare a bilingual index before sending the file. A useful index looks like this:
| Question | Documents to assemble | Why it matters |
|---|---|---|
| Who died and where? | Death certificate, last French address, residence evidence and passport copies | Establishes the opening of the estate, the likely notary and the cross-border law analysis |
| What family link is claimed? | Birth, marriage, divorce, adoption and name-change records | Separates biological child, adopted child, spouse’s child and testamentary beneficiary |
| What did the deceased sign? | Original will, codicils, law-choice clause, notarial deposit and any English probate papers | Determines the form, priority and intended scope of the disposition |
| What assets and liabilities exist? | French title records, bank statements, UK account records, pension statements, loans and invoices | Identifies the net estate, French-situs assets and possible UK exposure |
| What tax has been paid? | French declaration, assessment, receipts, UK IHT forms, treaty correspondence and exchange-rate calculations | Supports a credit, repayment, correction or challenge if two countries tax the same transfer |
Translation and authentication should be handled early. An English birth certificate that arrives after the French declaration deadline may delay the notarial deed and cause the beneficiary to be treated provisionally under the wrong category. The notary may need a full certified copy, an apostille issued under the applicable international convention and a French translation by an authorised translator. “Apostille” is not a translation; it authenticates the signature or seal on a public document. These are separate requirements.
The tax deadline is also strict. Article 641 of the General Tax Code provides:
Les délais pour l’enregistrement des déclarations que les héritiers, donataires ou légataires ont à souscrire des biens à eux échus ou transmis par décès sont :
De six mois, à compter du jour du décès, lorsque celui dont on recueille la succession est décédé en France métropolitaine;
D’une année, dans tous les autres cas.
In practical terms, a death in metropolitan France generally gives six months for the inheritance-tax declaration, while the one-year rule applies in the other cases described by the text, including a death outside metropolitan France. Article 641 bis of the General Tax Code can extend the period to twenty-four months for certain immovable assets whose ownership was not properly recorded before death, subject to its conditions. A British heir should not assume that the extra time applies simply because the file is international.
When a French asset is blocked, first identify the type of refusal. A bank may be waiting for proof of heir status; the notary may be waiting for an apostilled civil-status document; the tax office may be waiting for payment or a guarantee; or another heir may dispute the will or the valuation. Each problem requires a different response. Send a dated written request asking for the missing item, the legal reason for the refusal and the step that will release the asset. Preserve delivery evidence and all versions of the documents.
If the dispute concerns the protected share, apply the reduction timetable under Article 921 and obtain a full estate accounting. If it concerns filiation or adoption, take the civil-status evidence to the tribunal judiciaire with advice on jurisdiction and limitation. If it concerns tax, obtain the assessment and challenge the classification or calculation through the competent tax procedure, while considering whether payment under protest, a repayment claim or a treaty credit preserves the position. A complaint that simply says “the stepchild should be treated like a child” will be too general; the claim should identify the statute, exception, document and amount.
One recent court example underlines the need to plead the right legal route. In the Bobigny decision cited above, the court annulled the benefit of the direct-line inheritance-tax rate on the facts before it. In the Nanterre adoption decision, the court pronounced simple adoption after applying the conditions governing the child of the other member of the couple. Those outcomes are not interchangeable. One concerns tax treatment, the other the creation of filiation. A British family should not use an adoption argument to repair a missing will after death, nor use a will to claim that an adoption took place.
Finally, check whether an existing French or British article already maps the wider choice-of-law and notarial process. Our related guide, Does a UK Will Work in France After Brexit? Choice of Law, French Reserved Heirs and the Notary Process, addresses that broader framework. The present article narrows the analysis to the stepchild’s status, adoption, tax category and proof. Keeping those two questions separate reduces the risk of treating a broad treaty or will discussion as if it answered the beneficiary’s individual entitlement.
Conclusion
A British stepchild does not inherit from a French stepparent automatically after Brexit. Without adoption, the secure civil route is normally a properly drafted will that uses the disposable part and identifies the asset or share clearly. With simple adoption, the child may acquire a civil filiation, but the adoption procedure, the family evidence and the current tax exceptions must all be checked. For an unadopted legatee, the French tax starting point is commonly the 1,594 euro succession allowance and the 60% rate for a non-parent, subject to the complete facts, while Article 786 can produce a different result in a qualifying adopted-child exception.
Before the six-month or one-year declaration deadline, assemble the original testament, adoption and civil-status records, apostilles and French translations, the full asset and debt schedule, and the UK tax file. Ask the notary to state in writing whether the beneficiary is an heir, a legatee or an adopted child, which law governs the succession, which French tax provision applies and how any UK tax is credited. That written classification is the foundation for a correction, a treaty claim or court proceedings if the file is refused.
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