2
Patrimonial masses under this regime — each spouse's personal assets — with no community pool whatsoever, only individual ownership.
100%
Each spouse's autonomy over their own assets — free to acquire, manage, and dispose without the other's consent, subject only to the mandatory family home protection.
5 yrs
Prescription period for inter-spousal claims at dissolution, running from the date the divorce judgment becomes final (Cass. 1ère civ. 18-5-2022 n° 20-20.725 F-B).

The Regime and Its Appeal

The régime de séparation de biens requires a marriage contract executed before a notary before the wedding (or a court-approved change of regime for already-married couples). It is particularly favoured by traders and liberal professionals seeking to protect household assets from professional creditors, by spouses who have already experienced a divorce, by those with children from a prior relationship, and by couples marrying with greater pre-existing individual wealth and greater awareness of the possibility of separation.

Its appeal rests on two pillars. First, apparent simplicity: there is no community to manage, no joint consent required for ordinary asset transactions, and no récompenses mechanism to calculate at dissolution. Each spouse keeps what they earn and owns what they acquire. Second, patrimonial independence: each spouse's creditors are confined to that spouse's personal assets. A failed business, a professional negligence claim, or a personal debt does not threaten the household's wealth pool because there is no pool to threaten.

The regime is, however, extremely disadvantageous to the spouse without independent income or resources, who accumulates nothing during the marriage and participates in none of the other's wealth creation. Partial correctives have been developed — the société d'acquêts, compensation for unpaid professional collaboration, inter-spousal creditor claims — but none fully substitute for the economic sharing that community ownership provides.

Asset Ownership: Two Personal Patrimonies

Under the séparation de biens there are only two masses of assets: the personal patrimony of each spouse (C. civ. Art. 1536). No asset is jointly owned by default. Everything either spouse acquires — whether before or during the marriage, by any means — belongs exclusively to them.

Proving Ownership

The spouse who claims exclusive ownership of an asset must prove it (C. civ. Art. 1538). A spouse is deemed owner of assets acquired in their name, regardless of who financed the acquisition. If one spouse financed the purchase of an asset registered in the other's name, they can only claim a monetary creditor right against the other — they cannot claim ownership of the asset itself.

Assets whose ownership neither spouse can exclusively prove are presumed to be held jointly in equal shares (indivis par moitié). This residual presumption frequently applies to household moveable assets and to bank accounts that were used jointly. It can be rebutted by evidence, but that evidence must be clear and convincing.

Including ownership presumption clauses in the marriage contract can reduce disputes — for example, a clause providing that stock of a professional's business is presumed to belong to the spouse operating it, or that household moveable assets are deemed to belong to the last survivor. These presumptions are rebuttable by the spouses, their heirs, or their creditors, but they shift the evidentiary burden usefully in common situations (Cass. 1ère civ. 23-6-2021 n° 19-21.784 F-D).

Practical Discipline — Finance Proves Nothing, Only Title Does

Under the séparation de biens, financing an acquisition does not create ownership. A spouse who pays for an asset registered in the other's name owns nothing — they hold a monetary claim against the other. Every acquisition deed should record the actual owner clearly, and where one spouse finances the acquisition of an asset for the other, the legal basis of the payment (loan, gift, or contribution to marriage charges) should be explicitly stated in the deed or a contemporaneous private document.

Jointly Acquired Assets: Indivision

Where spouses purchase an asset together — typically the family home — they hold it in co-ownership (indivision) in the proportions stated in the deed. This is a voluntary indivision, subject to co-ownership rules. Such joint acquisitions deprive the séparation de biens of its essential rigour and simplicity: disputes over contribution shares, mortgage repayment claims, and the mechanics of unwinding joint ownership on divorce are among the most common litigation arising from this regime.

Liabilities: Personal, Not Shared

Each spouse remains solely liable for their debts — whether incurred before or during the marriage — with a single mandatory exception: household debts (dettes ménagères) are solidarily owed by both spouses, as under all French matrimonial regimes (C. civ. Art. 1536 and 215).

This separation extends to bank accounts: a bank cannot seize a joint account for a debt owed solely by one spouse without identifying that spouse's personal funds within it (Cass. 1ère civ. 20-5-2009 n° 08-12.922).

For joint income tax — which PACS partners and married couples file together — both spouses are jointly and severally liable for the full tax assessment. The spouse who paid the full amount may then pursue the other for their proportional share. The obligation to pay is shared; the contribution to pay is calculated individually.

Administration: Full Autonomy

Each spouse retains the administration, enjoyment, and free disposition of their personal assets (C. civ. Art. 1536). There is no joint consent requirement for any act relating to personally owned assets — other than the mandatory baseline protection of the family home. A spouse cannot sell, mortgage, or otherwise dispose of the family residence — even if it belongs to them alone — without the other's express consent (C. civ. Art. 215). This protection applies across all matrimonial regimes.

Inter-Spousal Claims at Dissolution: The Most Contested Ground

The séparation de biens' simplicity at dissolution frequently dissolves into complex disputes over inter-spousal financial claims. These arise whenever one spouse has, during the marriage, contributed financially to the other's patrimony without the transaction being documented or characterised at the time.

When a Claim Arises

A creditor claim (créance) between spouses arises when one settles, without intending a gift, a debt belonging to the other — most commonly financing the acquisition, construction, or improvement of the other's personal asset. The claim is not a récompense (a community regime mechanism); it is an ordinary civil claim, exigible from the moment it arises and independent of the dissolution of the regime.

The Mortgage Repayment Problem

One of the most litigated questions is whether a spouse who repaid a mortgage — either alone or in excess of their share — can claim reimbursement from the other on dissolution. The answer turns on whether the repayment was a contribution to marriage charges or a capital advance generating a claim.

The courts have drawn a clear line: mortgage repayments funded by a spouse's income are generally treated as contributions to marriage charges and cannot be reclaimed (Cass. 1ère civ. 25-9-2013 n° 12-21.892). But where the repayment was funded by a personal capital contribution — proceeds from a sale of personal assets, a specific savings deposit — the courts recognise a creditor claim (Cass. 1ère civ. 3-10-2019 n° 18-20.828 FS-PBI; Cass. 1ère civ. 17-3-2021 n° 19-21.463 FS-P). The distinction between monthly income-funded repayments (treated as charges) and lump-sum capital contributions (generating claims) has been confirmed for both jointly owned properties and improvements to the same type of property (Cass. 1ère civ. 9-6-2022 n° 20-21.277 F-B).

To pre-empt this litigation entirely, the marriage contract or a separate convention can define the scope of marriage charges and explicitly exclude — or include — mortgage repayments, with or without accountability between the spouses. Some notaries also recommend specifying each spouse's proportional contribution to repayments in the loan agreement itself.

The Undocumented Contribution Risk

A spouse who made significant capital contributions to the other's property during the marriage — financing improvements, paying down a mortgage — may lose those claims entirely if they cannot distinguish between income-funded repayments (treated as marriage charges, irrecoverable) and capital-funded contributions (generating a creditor claim). This distinction is fact-sensitive and subject to sovereign judicial assessment. The practical implication: document the origin and legal basis of every significant financial contribution at the time it is made, not retrospectively at divorce.

How Inter-Spousal Claims Are Valued

Unless the parties have agreed otherwise, inter-spousal claims are valued using the profit subsistant rules of Article 1469 al. 3 (by reference through Articles 1543 and 1479). Where the funds served to acquire, preserve, or improve an asset, the claim cannot be less than the profit subsistant — the increase in the asset's value attributable to the contribution, assessed at the date of liquidation. Where no profit remains, the claim equals the nominal amount expended (Cass. 1ère civ. 24-9-2008 n° 07-19.710). Claims bear interest from the date of formal demand, or from liquidation where valued by profit subsistant.

Settling inter-spousal claims is not a partage operation and does not require simultaneous dissolution of the regime. Claims can be raised and enforced independently, subject to the five-year prescription period running from the date the divorce judgment becomes final (Cass. 1ère civ. 18-5-2022 n° 20-20.725 F-B). During the marriage, this prescription is suspended.

Unpaid Professional Collaboration

A spouse who worked in the other's professional activity without remuneration may claim compensation for that contribution, on the basis of unjust enrichment — but must prove that the collaboration went beyond ordinary domestic assistance and that the enrichment of the professional spouse was not fully justified by advantages the claimant received in return. The amount is determined by reference to the profit subsistant where the collaboration enhanced a specific asset (Cass. 1ère civ. 12-12-2007 n° 06-15.547).

The Société d'Acquêts: Importing Community Where Needed

The severity of the séparation de biens for a spouse without personal income can be substantially mitigated by inserting a clause de société d'acquêts in the marriage contract (C. civ. Art. 1536 combined with Art. 1581 s.). The spouses create a partial community — the société d'acquêts — whose composition, administration, and liquidation they define. They can choose to pool all income, only the primary residence, or specific categories of assets.

Professional assets and the tools of one spouse's trade are typically left outside the société d'acquêts — they remain personal to the owning spouse and are not subject to partition or forced sale in a divorce — preserving the core liability protection that motivates choosing this regime. The société d'acquêts can be structured with a liquidation alternative clause: excluded assets may remain outside the société on divorce but be included on death, maximising spousal protection at death while preserving business continuity on separation.

Dissolution and Partition

The dissolution of a séparation de biens is straightforward in principle: each spouse keeps their own assets and answers for their own debts. In practice, the liquidation involves settling all inter-spousal monetary claims and partitioning any jointly held (indivis) assets.

The partition of jointly held assets follows the rules applicable to succession partitions: forms, maintenance in indivision, preferential allocation, licitation, partition effects, guarantees, and soultes (C. civ. Art. 1542). Preferential allocation (attribution préférentielle) of the shared home is available to a spouse under the séparation de biens — in contrast to cohabiting partners who do not benefit from this right.

The clause de faculté d'acquisition ou d'attribution — commonly inserted in séparation de biens contracts — allows the surviving spouse to acquire or be allocated specified personal assets of the predeceased at their liquidation value (C. civ. Art. 1390). This typically covers the family home, household furniture, and the professional business. It is a meaningful but limited protection: unlike the préciput (which operates free of charge in a community regime), the acquisition or attribution clause requires payment to the estate at current value.

Feature Séparation de biens Communauté réduite aux acquêts
Asset ownership during marriage Each spouse owns only what they acquire in their name Acquests jointly owned; personal assets remain individual
Professional income Belongs solely to the earning spouse Falls into the community pool
Revenues from personal assets Belong to the owning spouse Fall into the community from receipt
Creditor protection Strong — each spouse's creditors confined to their own assets Limited — community assets exposed to either spouse's debts
Major transactions Each spouse acts alone on their own assets Joint consent required for major community transactions
Settlement at dissolution Inter-spousal monetary claims (no récompenses mechanism); partition of indivis assets Personal asset recovery, récompenses settlement, equal partition of community net assets
Spousal protection at death Limited — requires acquisition/attribution clause, will, or life insurance Stronger by default; préciput and attribution clauses available
Key Points: What Every Couple Under the Séparation de Biens Must Know
Each spouse owns only what they acquire in their own name — financing an asset does not create ownership; only registration in the deed creates title.
Assets whose ownership cannot be proved by either spouse are presumed jointly owned in equal shares — maintain clear records and purchase documents for all significant assets.
Each spouse's creditors are limited to that spouse's personal assets — this is the regime's primary advantage for entrepreneurs and professionals with liability exposure.
The family home cannot be sold or encumbered without the other spouse's consent, regardless of who owns it — this mandatory baseline rule applies across all matrimonial regimes.
Mortgage repayments funded from income are generally treated as marriage charges and cannot be reclaimed at dissolution; capital contributions can generate an inter-spousal claim — document the source of every significant payment at the time it is made.
Inter-spousal claims are valued at the profit subsistant if the funds served to acquire or improve an asset; they prescribe five years from the date the divorce judgment is final.
A société d'acquêts clause in the contract can introduce selected community elements — income pooling, shared residence — without abandoning the core separation and its creditor protection.
Dissolution requires partitioning all jointly held assets under co-ownership rules; inter-spousal claims are independent of the partition and can be asserted separately.
The acquisition or attribution clause for the surviving spouse requires payment at current value — it is not a free benefit, unlike the préciput available in a community regime.
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This article is provided for general information and educational purposes only. It does not constitute legal advice. French matrimonial law is technical and the consequences of the séparation de biens depend heavily on individual circumstances, asset structures, and whether the marriage contract contains tailored provisions. Always seek advice from a qualified French notary or lawyer. Legal references are correct to the best of the author's knowledge as of the date of publication.