3
Distinct legal frameworks govern which country's matrimonial law applies — determined by the date of the marriage: before 1992, 1992–2019, or from 29 January 2019.
18
EU member states bound by Regulation 2016/1103, including France, Germany, Spain, Italy, Belgium, the Netherlands, Austria, and Portugal.
10 yrs
Period of common habitual residence after which automatic substitution of applicable law can trigger under the Hague Convention — often without the couple's knowledge.

Why the Applicable Law Question Is Urgent

Every married couple has a matrimonial regime — even if they have never consciously chosen one. For couples with an international dimension, identifying which country's law governs that regime is the essential first step before any significant patrimonial decision: buying property, setting up a business, planning an estate, or simply opening a bank account. The answer governs who owns the family home, who can sell it, whether a professional debt can reach household savings, and how assets will be divided at death or divorce.

International private law does not allow couples to avoid the question by ignoring it. In the absence of a deliberate choice, objective legal criteria — place of first habitual residence, common nationality, or closest connection — determine the applicable law automatically. And that determination can change during the marriage without either spouse doing anything at all, through the mechanism of automatic substitution that applied to couples married between 1992 and 2019 under the Hague Convention.

The first task for any practitioner advising a couple with a cross-border element is to identify the date of the marriage — because three entirely distinct legal frameworks apply depending on whether the couple married before 1 September 1992, between that date and 28 January 2019, or on or after 29 January 2019.

Date of marriageApplicable frameworkAutomatic law change risk?Voluntary law change from 29 Jan 2019
Before 1 September 1992French private international law rules (judge-made)No — but can opt into Hague Convention by declarationEU Regulation 2016/1103 applies
1 September 1992 – 28 January 2019Hague Convention of 14 March 1978Yes — automatic substitution after 10 years common residence or on return to shared nationality stateEU Regulation 2016/1103 applies
From 29 January 2019EU Regulation 2016/1103No — automatic substitution abolishedEU Regulation 2016/1103 applies

Couples Married Before 1 September 1992: French Private International Law

For couples married before 1 September 1992, French courts apply traditional judge-made private international law rules. The central principle is the loi d'autonomie de la volonté: the law chosen — or presumed chosen — by the spouses at the time of their marriage governs the regime. Where no marriage contract was executed, French courts infer the spouses' implicit intention from the law of their first matrimonial domicile — the place where they first, stably and deliberately, fixed their pecuniary interests after the wedding (Cass. 1ère civ. 19-9-2007 n° 06-15.295). A change of domicile twelve years after the marriage could not displace the first domicile presumption (Cass. civ. 3-10-2019 n° 18-22.945 F-D).

Where a marriage contract was executed, it may designate a specific foreign law — provided that law does not conflict with the public order of the couple's home country. The contract must be given publicity if the marriage takes place in France: the notary delivers a certificate, and the existence of the contract is declared in the marriage record (C. civ. Art. 1394 and 75).

Couples Married 1992–2019: The Hague Convention and the Automatic Change Trap

The Hague Convention of 14 March 1978 governs couples married between 1 September 1992 and 28 January 2019. It applies regardless of the spouses' nationality or habitual residence — even where one or both are nationals of states that did not ratify the Convention (only France, the Netherlands, and Luxembourg are full parties). The Convention has universalist application.

Choosing the Applicable Law

The Convention gives priority to the spouses' choice. Before or at the time of marriage, they can designate the law of one spouse's nationality or habitual residence at the time of designation, or the law of their intended future habitual residence (Conv. La Haye Art. 3). The choice must be expressed in writing — in France, by notarial deed. Spouses are advised not only to designate a law but also to specify the nature of the matrimonial regime they wish to adopt within that law (C. civ. Art. 1397-3 al. 3).

Worked Example — Law Choice Under the Hague Convention

A French national and a German national meet while both live in Austria. They plan to move to Canada after marriage. Under the Convention, they can choose between French law (French spouse's nationality), German law (German spouse's nationality), Austrian law (current habitual residence), or Canadian law (future intended habitual residence — but this choice lapses if the move to Canada does not materialise).

They sign a notarial deed in France designating French law and specifying the communauté réduite aux acquêts as their regime.

Absent Choice: The Default Criteria

Where no law is chosen, the Convention applies objective criteria in cascading order (Conv. La Haye Art. 4):

  • The law of the spouses' first common habitual residence after the marriage — the primary criterion. An English woman and an Italian man who marry and immediately settle in France are governed by the French communauté réduite aux acquêts.
  • Failing a first common habitual residence: the law of their common nationality, if they share one.
  • Failing both: the law of the state with which the couple has the closest connection overall.

The Automatic Substitution Danger

Where the spouses' regime was determined by objective criteria (not by express choice), the applicable law is automatically replaced by the law of a new state in three situations (Conv. La Haye Art. 7):

  • The spouses establish their habitual residence in the state whose nationality they both hold — for instance, two French nationals whose first residence was in Belgium and who later return to France;
  • The spouses have had their habitual residence in the same state for ten years or more after the marriage;
  • The spouses establish a first common habitual residence in a state whose law they were previously governed by under the common nationality criterion.
The Automatic Change You Never Knew About

This substitution operates automatically — the spouses do not need to do anything, and are often entirely unaware it has occurred. A British-French couple who married in 2005 with the UK as their first common habitual residence and later moved to France may find that after ten years of French residence, French matrimonial law automatically replaced English law as the governing regime. Their assets acquired in France after that substitution are governed by the French community regime — even though they never signed a French marriage contract and may believe themselves to be governed by English law throughout. Every internationally mobile couple married between 1992 and 2019 should be advised to formalise a declaration of applicable law to block automatic substitution.

Crucially, the automatic substitution operates only for the future: assets acquired before the change remain governed by the old law. This creates a fractured legal landscape where different assets within the same couple's patrimony are governed by different rules — a complexity that manifests most acutely at liquidation on divorce or death.

Couples Married from 29 January 2019: EU Regulation 2016/1103

EU Regulation 2016/1103 applies to all couples who marry on or after 29 January 2019, within the 18 participating EU member states. It also governs voluntary changes of applicable law made on or after that date by any couple, including those married before 29 January 2019 under the earlier rules.

Key Features

No automatic substitution: The Regulation abolishes automatic changes of applicable law during the marriage entirely (Art. 26, Reg. 2016/1103). Whatever law applies when the regime is established continues to apply until the couple actively changes it. This eliminates the most significant danger facing internationally mobile couples under the Convention — but a couple whose first habitual residence was briefly established in one country before a long-term move elsewhere will find themselves governed by the first country's law indefinitely, unless they act.

The judicial escape valve: To address the rigidity of a perpetually fixed connecting factor, the Regulation allows the court seising a matrimonial matter to apply the law of the last common habitual residence instead of the law of the first one — but only on judicial decision, at the request of one spouse, where that last residence was significantly longer than the first and the spouses organised their patrimonial affairs in reliance on it (Art. 26(3), Reg. 2016/1103).

Restricted law choice: Under the Regulation, spouses may designate only the law of one spouse's habitual residence or nationality at the time of the choice. The choice of a future habitual residence — available under the Convention — is no longer permitted. Where French connecting factors designate France as the state of applicable formalities, the choice must be made by notarial deed (Art. 23, Reg. 2016/1103).

Universal scope for all assets: The Regulation applies the chosen or designated law to all assets covered by the regime, wherever located. The derogation available under the Hague Convention — allowing specific immoveable assets to be governed by the lex situs — is abolished.

Worked Example — EU Regulation 2016/1103 Defaults

An Italian national and a Spanish national marry in France in March 2021. They immediately settle in Paris. Absent any choice of law, their matrimonial regime is governed by French law — the law of their first common habitual residence — meaning the communauté réduite aux acquêts applies by default.

Their Italian and Spanish assets are also governed by French matrimonial law, since the Regulation applies universally to all assets. A brief Paris residence is sufficient to fix French law: even a few weeks can establish a first habitual residence under the Regulation's 49th recital.

Changing the Applicable Law Under the Regulation

Spouses may change the applicable law at any time — whether they married before or after 29 January 2019 — by designating the law of one spouse's habitual residence or nationality at the time of the new choice (Art. 22, Reg. 2016/1103). The change operates prospectively only, unless the spouses expressly agree retroactive effect, which cannot prejudice the rights of third parties. Couples married before 29 January 2019 who change their applicable law from that date onwards are subject to the Regulation — not the Convention or the earlier French rules.

The Paradox: Change Is Easier for International Couples

One of the most striking features of French matrimonial private international law is the asymmetry it creates between purely domestic and international couples. A French couple married in France under French law who wish to change their matrimonial regime must comply with the full procedure of Article 1397 of the Civil Code: notarial deed, notification of children and creditors, three-month opposition period, and sometimes judicial homologation.

A couple with an international element can simply designate a new applicable law and, within the same act, choose a specific regime within that law — without any opposition period, without notification of children or creditors, and without judicial control. The international route to regime change is faster, cheaper, and less contested than the domestic one. This opportunity is systematically underused by internationally mobile couples.

What International Couples Must Do

For every couple with a cross-border element, formalising a declaration of applicable law is indispensable — not optional. The practical steps depend on when the couple married:

  • Married before 1992: Identify the first matrimonial domicile and verify which law it designates. Consider whether a declaration under the Hague Convention or under EU Regulation 2016/1103 (available from 29 January 2019) should be made to clarify or change the applicable law.
  • Married 1992–2019: Urgently check whether automatic substitution has already occurred, or is imminent under the ten-year rule. If the couple's current position is unclear or unsatisfactory, designate a new applicable law under EU Regulation 2016/1103.
  • Married from 2019: Identify the first common habitual residence — even a brief one — as it will fix the applicable law indefinitely unless proactive steps are taken. If the first habitual residence does not reflect the couple's long-term intentions, designate the preferred applicable law promptly.
Planning Point — Designate Both Law and Regime

When making a declaration of applicable law — whether under the Convention or the Regulation — the spouses should not merely designate a country's law. They should also specify the nature of the matrimonial regime they wish to adopt within that law: the default regime, or a specific contractual regime. A declaration that says "we designate French law" without specifying the regime leaves open whether the default community regime or a contractual separation applies. Where French formalities govern, the declaration must be notarised (C. civ. Art. 1397-3 al. 3).

Key Points: What Every International Couple with Ties to France Must Know
The applicable law to your matrimonial regime depends on your wedding date — three entirely different frameworks apply for marriages before 1992, between 1992 and 2019, and from 29 January 2019.
Without an express choice of law, objective criteria — first common habitual residence, common nationality, or closest connection — determine which country's regime governs your assets automatically.
Couples married between 1992 and 2019 face the risk of automatic substitution of applicable law: after 10 years of common residence in a new state, or on returning to the state of shared nationality, the governing law changes without any act by the spouses — often without their knowledge (Conv. La Haye Art. 7).
EU Regulation 2016/1103 (from 29 January 2019) abolishes automatic substitution — but the law of the first common habitual residence fixes permanently until a voluntary change is made. A brief first habitual residence — even a few weeks — can fix the applicable law permanently (Art. 26, Reg. 2016/1103).
Under the Regulation, law choice is limited to the law of one spouse's habitual residence or nationality — the choice of a future habitual residence (available under the Convention) is no longer permitted (Art. 22, Reg. 2016/1103).
International couples can change their applicable law — and within the same act choose a specific matrimonial regime — more easily than purely domestic French couples, without the notification, opposition period, and judicial homologation of C. civ. Art. 1397.
The declaration of applicable law must be notarised where French formalities apply; the spouses should specify not just the law but also the specific regime adopted within that law — a declaration of "French law" without specifying the regime may leave uncertainty about the default vs contractual regime (C. civ. Art. 1397-3 al. 3).
International Couple with Assets in France?

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This article is provided for general information and educational purposes only. It does not constitute legal advice. The determination of the applicable law to a matrimonial regime is highly fact-specific and depends on the date of marriage, nationality, habitual residence history, and any prior declarations or contracts. Always seek advice from a qualified French notary or lawyer with expertise in international private law.