Co-ownership Shares (Tantièmes) in Belgium: What They Are and How They Work

Tantièmes are the numerical shares that define each lot's proportional stake in the common parts of a Belgian co-ownership. They are not an abstract concept — they directly determine how much you pay in charges, how much weight your vote carries at the general assembly, and what fraction of the building's patrimony you own. For international owners, understanding tantièmes is fundamental to navigating Belgian property ownership.

Definition and Legal Basis

Under Art. 577-3 Belgian Civil Code, every private lot in a co-ownership is associated with an undivided share (quote-part indivise) in the common parts. This share is expressed as a fraction — typically in thousandths (‰) for residential buildings or ten-thousandths for larger complexes.

The tantièmes are established in the base deed (acte de base) at the time of the building's division and are registered at the mortgage office. They cannot be unilaterally modified by the syndic or the council of co-ownership.

How Tantièmes Are Calculated

Art. 577-4 Belgian Civil Code requires that the tantièmes be determined based on the net value of each lot, taking into account:

Surface area: the most significant factor. Larger apartments receive more shares.
Floor level: upper floors typically command higher values due to light, views, and reduced noise.
Orientation: south-facing units may receive marginally more shares than north-facing ones.
Purpose: commercial lots on the ground floor may have different valuation criteria than residential apartments.
Access to common facilities: a lot with direct garden access or a private terrace on common parts may receive additional shares.

The calculation is usually performed by a surveyor (géomètre-expert) commissioned by the developer or the notary at the time of the building's creation.

Concrete Example: A 10-Unit Building

| Lot | Description | Surface (m²) | Floor | Shares (‰) | |-----|------------|--------------|-------|------------| | 1 | Commercial unit | 120 | 0 | 110 | | 2 | Studio | 40 | 1 | 55 | | 3 | 1-bed apartment | 65 | 1 | 80 | | 4 | 1-bed apartment | 65 | 2 | 85 | | 5 | 2-bed apartment | 90 | 2 | 105 | | 6 | 2-bed apartment | 90 | 3 | 110 | | 7 | 1-bed apartment | 65 | 3 | 85 | | 8 | 3-bed apartment | 110 | 4 | 130 | | 9 | Garage | 15 | -1 | 20 | | 10 | Garage | 15 | -1 | 20 | | | Total | | | 800 |

The remaining 200‰ might be allocated to additional garages or cellars not shown. Note how identical apartments on higher floors receive slightly more shares, reflecting their higher market value.

Three Functions of Tantièmes

Tantièmes serve three distinct but interrelated purposes:

Charge distribution: each co-owner pays common charges in proportion to their tantièmes. If the annual budget is €50,000 and your lot holds 105‰, your share is €5,250.
Voting weight: at the general assembly, each co-owner's vote is weighted by their tantièmes. Majorities are calculated based on shares, not headcount.
Patrimony share: if the building is sold entirely or the ACP is dissolved, each co-owner receives proceeds proportional to their tantièmes.

General vs Special Charge Keys

While tantièmes determine the general charge distribution, Belgian law allows for special charge keys for expenses related to specific common elements. For example, lift costs may be shared only among units on floors 1 and above, using a separate key based on floor level and surface. The co-ownership regulations must define these special keys explicitly (Art. 577-4 Belgian Civil Code).

Anti-Abuse Voting Rule

To prevent a single large owner from dominating the GA, Art. 577-6 §7 Belgian Civil Code provides that no co-owner may cast votes exceeding the total of all other co-owners present or represented. In practice, if an owner holding 520‰ attends a GA where 300‰ of other shares are represented, that owner's voting power is capped at 300‰.

Contesting Tantièmes

If a co-owner believes the tantièmes are incorrect — for example, because a lot was assigned shares disproportionate to its surface — they may pursue a correction through:

Surveyor review: commissioning an independent géomètre-expert to assess the current net value of lots.
Justice of the peace (Art. 577-12 Belgian Civil Code): filing a claim to have the tantièmes judicially adjusted.
GA vote: a modification of tantièmes requires a four-fifths majority (Art. 577-6 §11 Belgian Civil Code) and a new notarial deed.

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