Moving permanently from the United Kingdom to France does not, by itself, convert an English, Welsh, Scottish or Northern Irish marriage into a French marriage contract. It can nevertheless expose a couple to a different court, a French notarial deed, French publicity rules and creditors who need to know which spouse owns what. The practical question is not simply where the family lives today. It is which law governed the couple’s matrimonial property regime when they married, whether they made a valid choice of law, whether that choice can be recognised in France, and whether a later change has been made public.

In this article, a matrimonial property regime means the legal rules governing ownership, management, debts and the financial consequences of divorce or death between spouses. The French expression is régime matrimonial. Brexit makes the review more urgent because “UK law” is not one single matrimonial-property system: England and Wales, Scotland and Northern Ireland have different legal frameworks, and a British marriage may also have been concluded in a third country. A move, a French home, a business risk, adult children or a planned estate may expose an arrangement that was never documented clearly.

The route is usually a two-stage exercise. First, identify the law and regime that already apply. Secondly, ask whether a French notary can record a choice of law or a change of regime and complete the notices needed to protect the change against third parties. The following plan is designed for British spouses already living in France or preparing a durable move. It does not replace a review of the individual marriage, assets, creditors and succession documents.

I. What matrimonial property regime applies to British spouses after moving to France?

A. Does moving from the UK to France automatically change a marriage regime after Brexit?

No. A change of address is not the same thing as a new marriage contract. The date and place of the marriage, the spouses’ habitual residence immediately after the marriage, their nationalities, any pre-nuptial or post-nuptial agreement, and any express choice of governing law must be examined together. The answer can also depend on whether the spouses married in England and Wales, Scotland, Northern Ireland or elsewhere. Calling the couple “British” is not enough to identify the applicable law.

French private international law starts with the autonomy of the spouses, subject to mandatory rules. Article 1387 of the French Civil Code states: « La loi ne régit l’association conjugale, quant aux biens, qu’à défaut de conventions spéciales que les époux peuvent faire comme ils le jugent à propos, pourvu qu’elles ne soient pas contraires aux bonnes moeurs ni aux dispositions qui suivent. » In English, the spouses’ agreement matters first, provided it does not override mandatory protections. The official text is available in Article 1387 of the French Civil Code.

That principle does not mean that any document headed “pre-nuptial agreement” automatically selects a governing law. A document may regulate beneficial ownership under English law, record a Scottish contract, deal with succession, or merely set out the couple’s intentions. A French notary must determine what the document actually does, whether it was validly made, which law governs it, and how it can be proved in France. A translated copy without the original formalities is not a reliable answer.

The French Civil Code also gives the form of a French matrimonial agreement. Article 1394 provides: « Toutes les conventions matrimoniales seront rédigées par acte devant notaire, en la présence et avec le consentement simultanés de toutes les personnes qui y sont parties ou de leurs mandataires. » The rule concerns a French matrimonial convention: it must be a notarial deed made with the simultaneous consent of the parties or their authorised representatives. It does not retrospectively turn every UK agreement into a French acte notarié. See Article 1394 of the French Civil Code.

For an international marriage, the first residence after the marriage can be decisive when there was no effective choice. In Cour de cassation, First Civil Chamber, 13 April 2016, no. 15-17.541, the court recorded the rule that « la loi applicable à un régime matrimonial régissant les rapports patrimoniaux entre conjoints étrangers est, soit la loi d’autonomie, soit la loi de leur premier domicile conjugal ». The case concerned foreign spouses and the 1978 Hague Convention, not a British couple, so it is not a shortcut to a result. It is a warning about the evidence needed: the first shared home after the wedding may matter more than the place where the couple later retires.

The same decision referred to the universal reach of the Hague Convention of 14 March 1978 in the circumstances before the court. France’s implementing material and the treaty history should be read with the marriage date and the spouses’ facts, rather than with a generic internet rule. The French Code specifically addresses a designation of applicable law made under the Hague Convention in Article 1397-2. Older marriages and later choices can fall under different transitional arrangements, so the notary should be given the marriage date and every earlier agreement before anyone assumes that a move to France caused an automatic change.

European rules may also be relevant to a case heard or recognised in France. Regulation (EU) 2016/1103 contains rules on the law applicable to matrimonial property regimes in participating Member States. Its choice-of-law framework can allow spouses to select the law of a habitual residence or nationality in the situations covered by the Regulation. The United Kingdom’s status and the dates of the marriage and choice must still be checked; a British passport does not itself answer the French conflict-of-laws question. The Regulation must not be confused with the Withdrawal Agreement, a residence permit or a tax treaty.

The current French Code also distinguishes a choice of applicable law from the choice of a French regime. Article 1397-3 states that, during the marriage, spouses must arrange the publicity of a designation of the applicable law and may, on that occasion, designate the nature of the matrimonial regime. This is especially important for a British couple who believes that a UK agreement is obvious to every French bank, lender, purchaser or court. Private certainty between the spouses and opposability to third parties are separate questions.

The Supreme Court’s recent international decision reinforces the need to identify the connecting factors rather than rely on nationality labels. In Cour de cassation, First Civil Chamber, 1 July 2026, no. 24-15.575, the court stated: « La loi de la nationalité étrangère commune de deux époux doit régir, en application du texte précité, le régime matrimonial lorsque les époux n’établissent pas sur le territoire du même État leur première résidence habituelle après le mariage, peu important que l’un des époux ait également la nationalité française. » The facts involved Algerian nationality and a French dual national, not the United Kingdom. Its value for British readers is methodological: a dual nationality, a later French residence or a French child does not allow a file to skip the applicable conflict rule.

A practical reconstruction should therefore answer these questions before any change is signed:

• Where and on what date did the spouses marry?
• Where did they first establish a shared habitual residence after the marriage?
• Did they live separately at the start, or move between UK jurisdictions?
• Was there a pre-nuptial, post-nuptial or Scottish marriage contract?
• Did the document select a law, a regime, or only a result such as separate ownership?
• Did either spouse have a second nationality at the relevant time?
• Has a previous change been recorded in a civil-status register, deed or foreign court order?
• Which creditors, companies, adult children or family donors could rely on the previous arrangement?

The answer is not changed merely because the couple now files tax returns in France, holds a French residence permit or has a French bank account. Tax residence, immigration status, succession law and matrimonial property law interact, but they are not interchangeable. A couple can be French tax resident while its matrimonial property regime remains governed by another law. Conversely, a French regime does not decide where a pension, trust or estate is taxed.

The GOV.UK Living in France guide also warns that the UK government and the British Embassy cannot give personalised advice on moving, living or retiring in France, and it directs British residents towards documents, lawyers, translators and notaries. That is a useful boundary: the British side can explain official documents and residence issues, but the regime analysis requires the facts of the marriage and the law that governs the spouses’ property relations.

B. Which French regime protects the family home, debts and accumulated wealth?

Once the applicable law is identified, the couple must understand the actual regime rather than rely on a label translated from English. French law offers several structures, and a foreign regime may produce a result that does not map neatly onto any one of them.

If French law applies and the spouses made no contrary agreement, the familiar default is the communauté réduite aux acquêts, meaning the community of acquisitions. The community is not a declaration that every asset is jointly owned from the wedding day. Article 1401 of the French Civil Code says: « La communauté se compose activement des acquêts faits par les époux ensemble ou séparément durant le mariage, et provenant tant de leur industrie personnelle que des économies faites sur les fruits et revenus de leurs biens propres. » The operative questions are when an asset was acquired, how it was financed, whether it was inherited or gifted, and what evidence exists.

This regime can suit a couple who wants income and acquisitions made during the marriage to be shared. It can also create serious work when the spouses have a UK investment portfolio, a pension-related lump sum, a family gift, a business, or assets accumulated before their French move. Bank statements, completion statements, inheritance papers and gift deeds may become central evidence. A translation of “joint” or “separate” in a UK document is not enough to calculate the French community.

Separation of property is different. Under Article 1536 of the French Civil Code, « Lorsque les époux ont stipulé dans leur contrat de mariage qu’ils seraient séparés de biens, chacun d’eux conserve l’administration, la jouissance et la libre disposition de ses biens personnels. » The same article adds that each spouse remains solely liable for debts arising in that spouse’s name, subject to Article 220. In practical terms, separation can reduce the risk that one spouse’s professional or investment activity automatically becomes community property, but it does not erase guarantees, household debts, co-ownership, concealment or the rules protecting the family home.

French separation also requires proof. Article 1538, within the same Code civil chapter on separation of property, deals with exclusive ownership, contractual presumptions and goods for which neither spouse can prove exclusive ownership. A couple who changes to separation after years of using one account for everything may face a difficult reconstruction. The new deed does not magically create statements that were never kept.

Participation in acquisitions, or participation aux acquêts, is a hybrid. During the marriage it functions broadly like separation for the administration of personal property; at dissolution, the spouse with the lower net acquisitions may have a claim against the other. Article 1569 states: « Pendant la durée du mariage, ce régime fonctionne comme si les époux étaient mariés sous le régime de la séparation de biens. A la dissolution du régime, chacun des époux a le droit de participer pour moitié en valeur aux acquêts nets constatés dans le patrimoine de l’autre ». This may appeal to spouses who want day-to-day autonomy with a sharing mechanism on divorce or death, but it demands an opening asset statement and reliable valuation evidence.

Community universelle, or universal community, can be considered where the couple wants a broad pooling of assets and possibly an attribution clause for the survivor. It is not a universal answer for a British couple with children from an earlier relationship, family assets, business creditors or cross-border inheritance. A change can protect a spouse in one scenario and reduce a child’s expected share or expose assets in another. The notary must model the result at divorce, death, incapacity and enforcement, not only at the signature date.

The family home has its own protection. Article 215 of the French Civil Code provides: « Les époux ne peuvent l’un sans l’autre disposer des droits par lesquels est assuré le logement de la famille, ni des meubles meublants dont il est garni. » This is a protection of the family residence, not a substitute for identifying ownership or the applicable regime. One spouse should not assume that a separate title or a UK agreement gives an unrestricted power to sell, mortgage or surrender the family home in France.

Household liability is also distinct from ownership. Under Article 220, « Chacun des époux a pouvoir pour passer seul les contrats qui ont pour objet l’entretien du ménage ou l’éducation des enfants : toute dette ainsi contractée par l’un oblige l’autre solidairement. » The provision contains exceptions for manifestly excessive expenses, certain instalment purchases and loans made without both spouses’ consent. Moving to separation is therefore not a way to tell a lender that the other spouse can never be pursued for ordinary household obligations.

The distinction matters for British business owners and landlords. A new regime may affect future acquisitions and the internal relationship between spouses. It may not release a spouse from a personal guarantee, alter an existing loan, defeat a creditor’s earlier rights or rewrite the ownership of an asset already acquired. The relevant contract, security, debt date and publicity must be reviewed separately.

The regime also does not replace a will. A will may determine who receives assets that form part of the estate, while the matrimonial regime determines what belongs to the deceased spouse, the surviving spouse or the community before succession is calculated. A French notary will normally need the wills, gifts, life-insurance information, family composition and foreign estate documents before recommending a change. The same caution applies to UK pensions, trusts, nominee arrangements and assets held through a company: their tax or succession treatment cannot be inferred from the matrimonial label alone.

The French government’s public-service information summarises the purpose of a regime as determining the financial relationship between spouses and the treatment of common, personal or jointly held property. It also recognises that a change can protect a spouse or limit risks linked to a professional activity. That is the useful decision point for a British couple: what risk is being solved, and what new risk is introduced by the proposed regime?

II. How can British spouses change or secure their regime in France?

A. What should British spouses prepare before asking a French notary to change the regime?

The first appointment should be a legal audit, not a request for a pre-selected form. The couple should tell the notary that the marriage is international, identify every country in which the spouses lived after the wedding, and disclose every agreement that may affect property. The notary must know whether the request is for a French change of regime, a designation of applicable law under an international instrument, recognition of an existing foreign arrangement, or a combination of those steps.

For a domestic French change, Article 1397 of the French Civil Code says: « Les époux peuvent convenir, dans l’intérêt de la famille, de modifier leur régime matrimonial, ou même d’en changer entièrement, par un acte notarié. » The same provision requires liquidation of the modified regime when necessary and protects the information rights of persons affected by the change. The three central conditions are therefore family interest, the consent of both spouses and a notarial deed. A one-sided plan to put assets beyond a creditor’s reach is not a safe use of Article 1397.

The file should normally include, at a minimum:

• full marriage certificates and any French transcription or civil-status record;
• passports, proof of nationality and evidence of any dual nationality;
• proof of the spouses’ first shared habitual residence after the wedding;
• every pre-nuptial, post-nuptial, separation, divorce or foreign court document;
• certified translations where the notary or a court requires them, with legalisation or apostille questions checked for each document;
• the French residence address and, where relevant, evidence of the date of the move;
• the identity and address of every adult child and any minor child requiring protective review;
• a list of companies, partnerships, professional guarantees, personal guarantees and substantial debts;
• a schedule of property, investments, pensions, trusts, gifts, inheritances and insurance;
• loan agreements, security documents, guarantees and recent creditor correspondence;
• wills, lifetime gifts and any agreement intended to benefit the survivor;
• a clear statement of the result sought if the marriage ends by divorce, death or incapacity.

British documents require special care. “Marriage certificate” can mean a certificate issued by a register office, a consular record, a religious record or a document from another country. “Prenup” may mean a contract drafted for an English court, while a Scottish marriage contract may have a different legal function. The question is not whether a document sounds familiar in English; it is whether a French authority can identify its legal effect and apply it to the asset, debt or transaction now under review.

The notary should be asked to separate four outputs in writing:

1. the law that currently governs the spouses’ property relations;
2. the regime or substantive rules that follow from that law;
3. the deed or designation proposed for the future; and
4. the date and conditions on which the change will bind spouses, children, creditors and other third parties.

This format prevents a common error: signing a French deed without understanding whether it changes past acquisitions, only future acquisitions, or the applicable law for the entire relationship. If liquidation is necessary, the deed must identify what leaves the old regime, what remains personal, what becomes common, and whether compensation or a balancing payment is due. Values should be recorded with the valuation date and supporting documents.

The choice of regime must be tested against the couple’s actual life. For example, a British spouse who runs a consultancy from France may want to isolate future professional risk, but separation does not cancel a guarantee already signed. A retired couple may want the survivor to retain control of the home, but universal community can have consequences for children from a first marriage and for assets that entered the family through a gift. A couple with unequal savings may prefer sharing at death but autonomy during life, which could point towards a participation structure rather than a simple translation of “separate finances”.

The French notary can also explain the practical consequences for a French home without turning this article into a property-purchase guide. The couple should ask who must sign a sale, mortgage, lease, major renovation loan or guarantee; which spouse can manage an account; whether an asset is presumed common; and what evidence a bank or land registry will request. Article 215 may require both spouses’ consent for the family home even where the title analysis looks different.

If the proposed transaction affects UK assets, the British side must be checked as well. The governing law for a bank account, pension, trust, shareholding or land is not always the same as the law governing the spouses’ relationship. A French deed may be essential evidence in France while still requiring a UK solicitor’s advice about recognition, enforcement, beneficial ownership or a registered title. The GOV.UK guide to living in France lists marriage documents and professional assistance among the issues British residents may need to address; it does not give a personal opinion on the validity or effect of a matrimonial agreement.

For an international choice of law, the publicity provisions deserve particular attention. Article 1397-3 states that when designation occurs during the marriage, the spouses must arrange the required publicity and may designate the nature of the regime at the same time. The applicable-law designation should be drafted with the same precision as a regime change: identify the law, the date, the instrument, the scope, and the assets or obligations for which the couple needs a clear third-party position.

The notary should also explain what is not being changed. A matrimonial deed does not automatically change a will, a lifetime gift, a pension nomination, a trust deed, a residence permit, tax residence or a UK court order. It does not decide the law of succession by implication. If the objective is survivor protection, the regime, will, gifts and insurance nominations should be reviewed as one plan, with the limits of each instrument identified.

B. When do children, creditors, a judge and third parties matter?

French procedure deliberately gives family members and creditors an opportunity to react. The change is not a private spreadsheet exercise. Under Article 1397, the people who were parties to the modified marriage contract and the adult children of each spouse must be personally informed of the proposed modification. The notice should identify the project sufficiently for the recipient to understand what is changing. For an international family, the notary should check addresses abroad, translation, service evidence and the identity of children from previous relationships.

The public-service process explains that adult children have three months from the information to oppose the proposed change. Creditors are informed by an announcement in a legally authorised newspaper in the area or department of the spouses’ domicile and may also oppose within three months of publication. The current Service Public procedure for changing a matrimonial property regime records these steps, the notary’s role, the possible court process and the costs that may arise from the value and composition of the assets.

The relevant statutory wording is precise. Article 1397 requires that « Les personnes qui avaient été parties dans le contrat modifié et les enfants majeurs de chaque époux sont informés personnellement de la modification envisagée. » It also provides that « Les créanciers non opposants, s’il a été fait fraude à leurs droits, peuvent attaquer le changement de régime matrimonial ». These are not decorative formalities. A creditor who did not oppose can still challenge a fraudulent change under the conditions set by the Code.

An opposition does not necessarily end the project, but it changes the route. The notarial act must be submitted for homologation by the tribunal judiciaire of the spouses’ domicile. Tribunal judiciaire means the ordinary civil court of first instance. In that proceeding, legal representation by an avocat is compulsory under the public-service guidance. The court will examine the proposed change and the interests at stake; the family must budget for the delay and for the evidence needed to show why the change is justified.

A minor child does not create a routine automatic court hearing in every case. The notary must check the child’s position, and the statutory provisions allow the judge responsible for protective matters to be involved where the child’s interests require it. If a spouse is under a legal protection measure, prior authorisation from the guardianship judge or family council may be required. These safeguards should be identified before the deed is drafted, not after notices have been sent.

The date of effect must be distinguished in at least three ways. Between spouses, a domestic change generally takes effect on the date of the notarial act or the homologating judgment. Against third parties, the change takes effect three months after the relevant mention has been made in the margin of the marriage record. A third party may also be bound where the spouses declared the change in an act signed with that third party, but relying on that exception is a poor substitute for completing the publicity.

Article 1397-4 of the French Civil Code uses the same distinction for a designation of applicable law made during the marriage: « Lorsque la désignation de la loi applicable est faite au cours du mariage, cette désignation prend effet entre les parties à compter de l’établissement de l’acte de désignation et, à l’égard des tiers, trois mois après que les formalités de publicité prévues à l’article 1397-3 auront été accomplies. » If the couple has only told its accountant or solicitor but has not completed the prescribed publicity, it should not describe the new law as unconditionally opposable to every French third party.

The Supreme Court has also made clear why old debts cannot be ignored. In Cour de cassation, First Civil Chamber, 22 March 2017, no. 16-13.365, the published analysis states: « Un créancier peut poursuivre un époux, après la date à laquelle le changement de régime matrimonial de la communauté en séparation de biens est devenu opposable aux tiers, au titre de l’engagement contracté par l’autre époux pendant la durée du régime de communauté ». The case applied the earlier wording of Article 1397 and other community provisions, so it must not be copied mechanically onto every modern file. Its practical warning remains direct: a later change of regime does not erase the history of a debt incurred while the former community existed.

The same principle appears in a case involving a foreign marriage contract. In Cour de cassation, First Civil Chamber, 8 June 2016, no. 15-20.089, the court recorded that, where foreign spouses raised a foreign regime, « les juges du fond doivent, dans l’hypothèse d’un mariage conclu entre époux étrangers, rechercher s’ils ne sont pas liés par un contrat de mariage réglant la liquidation de leur régime matrimonial ». A French court should not simply apply the French legal community because the couple owns assets or lives in France without first checking the foreign contract and the conflict rule. British spouses should expect the same discipline from their own file review.

For a creditor, the key questions are often chronological:

• When was the loan, guarantee, tax debt or business liability incurred?
• Which regime applied on that date?
• Was the creditor informed and given the statutory period to oppose?
• When was the deed signed, and when was the marriage-record mention completed?
• Did the spouses make a declaration in a later contract with the creditor?
• Is the change being used to defeat an existing enforcement right?

For adult children, the analysis is different but equally practical. They may be concerned about a universal community clause, a survivor-attribution clause, the disappearance of an asset from one parent’s personal estate, or the effect on a future succession. An opposition can lead to a court hearing, but silence after proper information is not the same as a family agreement on every future estate question. The parents should keep the notices, addresses, delivery evidence and final deed with the estate documents.

For the family home, the couple should record the address, the ownership title, the source of funds, any loan, the intended use and the consequences at death or divorce. Article 215 protects the family residence, while the chosen regime determines broader ownership and liquidation questions. The two rules should be written together in the notary’s advice. A UK couple should not assume that a home occupied during holidays has the same legal status as the family residence, or that a French address alone determines the regime.

For professional risk, the couple should list personal guarantees, director liabilities, partnership debts and unpaid tax separately from ordinary household expenditure. Article 220’s solidarity for household maintenance and children’s education is not the same as community ownership. Article 1536’s separation rule is not the same as a release from a signed guarantee. A post-Brexit move can also change where litigation occurs or which documents a creditor requests, but it does not make a debt disappear.

Finally, the couple should align the deed with its succession plan. A regime change may alter the assets that pass through an estate, the survivor’s financial position and the value available to children. A will that was drafted on the assumption of separate ownership can become misleading after a switch to community; a life-insurance nomination or UK pension direction may also need independent review. The deed, publicity evidence, will and asset schedule should be stored together, with a date for a future review if the couple moves again, acquires a business, divorces, becomes incapacitated or experiences a death.

Conclusion

For British spouses moving to France, Brexit is a reason to verify the matrimonial property regime, not a legal mechanism that changes it automatically. The decisive evidence is usually found in the marriage date, the first shared habitual residence, the spouses’ nationalities, any agreement, the applicable international instrument and the way the arrangement was publicised. A French residence permit, a French tax return or a French bank account does not answer those questions on its own.

The safest route is to ask a French notary to identify the existing law and regime before choosing a solution. The couple can then compare community of acquisitions, separation of property, participation in acquisitions or a more protective community structure against real events: a French family home, a UK pension, a business guarantee, adult children, a divorce, incapacity or death. The deed should explain its effect on past and future property, and it should be coordinated with wills, gifts, insurance, trusts and foreign assets.

The formalities are part of the protection. Both spouses must consent to a French change, the family interest must be demonstrated, the required people must be informed, creditors must receive the statutory publicity, and an opposition may require homologation by the tribunal judiciaire with an avocat. The date between spouses is not automatically the date against third parties. Keeping the deed without proving publicity can leave a British couple exposed precisely when a lender, child or court needs a clear answer.

Need a quick opinion on your case

If your marriage, assets or family links the UK and France, a focused review can clarify which law applies, whether a French notarial change is available, and what evidence must be prepared before creditors or children are notified. Consultation by telephone is available within 48 hours with a lawyer from the firm.

Call Maître Reda Kohen on +33 6 46 60 58 22, or use the contact form for the French office.