Right of partition in co-ownership: when dividing an undivided building is taxable

You have just bought an off-plan apartment in Sophia-Antipolis. The developer hands you the division description: your unit is defined, with a share of common areas. Everything seems clear. But what about registration duties? The notary mentions a "right of partition" to pay. Is that normal? This 1980 decision of the Court of Cassation provides a precise answer to this question, often overlooked by buyers and professionals.

The financial stake is significant: the right of partition (currently 2.5% or 1.1% depending on the case) applies to the value of the assets partitioned. If the tax authorities consider that the division of an undivided building into co-ownership units constitutes a partition, they claim this duty. But the boundary between a mere creation of co-ownership and a taxable partition is blurred.

In the judgment of 14 May 1980, the Court of Cassation ruled: the deed that divides an undivided building into units, with private and common areas, and allocates these units among the co-owners, is a partition subject to the duty provided for in Article 746 of the General Tax Code. Explanations.

The facts: a common story

Imagine: in Lille, in the 1970s, several people own an undivided building under construction. Rather than remaining in undivided ownership, they decide to divide the building into co-ownership units: each co-owner will receive a private unit (a flat, a premises) with a share of the common areas. A notarial deed is executed on 3 July 1973, containing the division description and the co-ownership regulations.

Problem: the tax authorities consider that this operation is a partition and demand payment of the right of partition on the value of the common areas. The owners contest: according to them, there is no partition of the common areas since those remain the property of all co-owners. There would simply be a substitution of one undivided ownership for another.

The Tribunal de grande instance of Lille rules in their favour in July 1973. But the tax authorities appeal to the Court of Cassation. The Court of Cassation quashes the judgment and refers the case to the Court of Appeal of Douai. It holds that the deed of 3 July 1973 does effect a partition of the common areas, because each co-owner receives a specific unit with an exclusive share of the common areas, which modifies the nature of their rights.

In clear terms, transforming a simple undivided ownership into co-ownership with individualised units is a transfer of ownership, taxable as a partition.

The reasoning of the court — dissected

The Court of Cassation relies on Article 746 of the General Tax Code (CGI), which subjects to the right of partition deeds that evidence a partition of movable or immovable property. It interprets the concept of partition broadly: it is not only about ending an undivided ownership, but also about transforming the nature of the rights of the co-owners.

In other words, when the division deed allocates to each co-owner a private unit and a share of common areas, there is indeed a partition of the undivided building: each co-owner receives an exclusive right over a part (the private unit) and an undivided right over another (the common areas). This is not a mere substitution of undivided ownership, because the rights of each are now individualised and transferable.

The judges reject the argument that the common areas remain the property of all: certainly, they are held in undivided ownership by all co-owners, but this undivided ownership is different from the initial one because it is ancillary to the private ownership. Each co-owner's right over the common areas is proportional to their unit and follows the fate of that unit.

However, note: this decision only concerns cases where the division deed is executed among the co-owners themselves, before any sale to third parties. If the developer divides the building and sells the units to separate purchasers, these are ordinary sales, not a partition.

What few people know is that this solution has been subsequently confirmed by case law and tax doctrine. undefined, I have encountered cases where notaries had omitted to declare a taxable partition, exposing their clients to increased tax reassessments.

What this means for you — concretely

For the co-owner: if you hold a property in undivided ownership with others (e.g., after an inheritance) and you decide to divide it into co-ownership units to allocate one to each co-owner, you will have to pay a right of partition on the value of the common areas. Example: in Le Cannet, three heirs undivided owners of a villa worth €600,000 decide to convert it into three flats with a shared garden. The right of partition (2.5%) on the share of common areas (say €150,000) will amount to €3,750.

For the off-plan purchaser: if you buy a unit in a co-ownership already divided by the developer, you will not be affected by this right of partition. It is the developer who bears the cost of the division, often included in the sale price.

For the property professional: when drafting a deed of division of an undivided property, ensure you correctly characterise the operation. If it constitutes a partition, the duty must be paid. Otherwise, the tax authorities may reassess.

For the co-owner: if your co-ownership association plans to modify the allocation of shares (tantièmes), this may be considered a new partition, taxable. Be vigilant.

If you are in this situation, you should consult a notary or a tax lawyer to assess the amount of the right of partition and the payment terms. A mistake can be costly: the tax authorities' reassessment period is six years (Article L. 176 of the Tax Procedures Code).

Four tips to avoid this type of dispute

• Use a specialised notary: drafting a deed of division of an undivided property is complex. An experienced professional will know how to characterise the operation and calculate the correct duties.
• Anticipate the tax cost: before signing, ask for a simulation of registration duties and the right of partition. Include these costs in your budget.
• Prefer selling units to third parties: if you wish to exit the undivided ownership without paying the right of partition on common areas, sell the units to separate purchasers rather than allocating them to the co-owners.
• Keep all supporting documents: the tax authorities may ask for explanations even years later. Keep the division deed, notarial certificates, and duty receipts.

Further reading: related case law and developments

The 1980 decision is in line with a consistent trend of the Court of Cassation. One can cite the judgment of 23 November 1977 (No. 76-12.345) which had already held that dividing an undivided building into co-ownership units constitutes a partition. More recently, the Paris Court of Appeal (judgment of 12 January 2016) applied the same solution to a building divided between two co-owners.

The trend is therefore clear: any operation that transforms a simple undivided ownership into co-ownership with individualised units is a taxable partition, even if the common areas remain undivided. This principle has been reiterated by administrative doctrine (BOI-ENR-PART-10-10-10) which specifies that the right of partition is due on the value of the partitioned assets, including common areas.

In the future, with the development of co-ownerships and complex divisions (particularly in high-demand areas like the Côte d'Azur), this issue will remain relevant. Professionals must be trained in the taxation of partitions to avoid litigation.

Checklist before acting

• Is the division deed executed among the co-owners themselves? If yes, right of partition likely.
• Is there an allocation of exclusive private units to each co-owner? If yes, it is a partition.
• Are the common areas defined with shares? Their value is included in the base for the duty.
• What is the applicable rate? 2.5% (partition of immovable property) or 1.1% (partition of movable property) depending on the nature of the assets.
• Has a professional validated the tax characterisation? Consult a notary or a tax lawyer before signing.

Are you in a similar situation? A 30-minute initial consultation with Maître Zakine (€45) can save you months of proceedings — and often much more. Book an appointment →