A collection does not divide the way a securities account does. Three children, fourteen canvases, no two pieces worth the same: joint ownership turns an estate into a dispute almost by default. The société simple exists to convert indivisible objects into divisible units — and for nothing else.
A société simple is a company without legal personality (art. 1:5, §1 of the Belgian Code of Companies and Associations). It pays neither corporate income tax nor the tax on legal entities: whatever the contributed assets produce is taxed in the partners' hands. Its role in succession planning rests on gifting the units — a flat 3% in direct line in Flanders and Brussels, 3.3% in Wallonia — while the donor stays on as manager. The trade-off: personal and joint liability, registration with the Crossroads Bank for Enterprises, a UBO filing and annual accounts.
What it is, legally
The Belgian Code of Companies and Associations opens its list with a definition by exclusion. Article 1:5, §1 states that the société simple is the company that has no legal personality; the following paragraph lists the seven forms that do have one — SNC, SComm, SRL, SC, SA, SE and SCE. So it is not a small company. It is a contract between partners that pools assets without creating a separate legal person.
Everything follows from that absence: the assets contributed remain the undivided property of the partners, and Book 4 of the Code governs their relationship — units, management, collective decisions, withdrawal, dissolution — without ever granting the structure an existence of its own. Since the Code entered into force on 1 November 2018 it is, however, an undertaking for the purposes of Belgian economic law.
Fiscal transparency is not a tax advantage
An entity without legal personality is subject to neither of Belgium's two entity-level taxes. Income is therefore treated as received directly by the partners, each in proportion to their share, and keeps its original character: a dividend remains a dividend and bears its withholding tax, rent remains property income, a capital gain follows its own rules.
The point is best read backwards. Transparency gains you nothing — it merely ensures the structure costs nothing extra. Which is exactly what is asked of it: to place a control vehicle between the assets and their beneficiaries without adding a layer of tax, where a conventional holding company would stack corporate income tax on the way in and withholding tax on the way out.
For an art collection the point is sharper still. Canvases on a wall generate no income, so the question of annual taxation does not arise. The société simple delivers no tax benefit here. It delivers governance.
The mechanism: give the units, keep the management
The scheme runs in two stages. Assets are contributed to the structure, which issues units to the contributors; those units are then gifted to the children, with or without a reserved usufruct, while the articles appoint the parent or parents as managers — often in the articles themselves, so that removal requires unanimity or a qualified majority fixed in advance.
The articles carry the real weight: duration, decision-making rules, inalienability and approval clauses, what happens to units on a child's divorce or death, distribution policy. That is where the gap lies between an organised transfer and a gift that exposes the assets immediately to whatever the next generation does with them.
Units in a movable société simple follow the flat rate for gifts of movable assets. 2026 rates:
| Region | Direct line, spouse, cohabitant | Other beneficiaries |
|---|---|---|
| Flemish Region | 3% | 7% |
| Brussels-Capital Region | 3% | 7% |
| Walloon Region | 3.3% | 5.5% |
The rate is flat: it does not rise with the amount given. That is the whole distance between gift tax and inheritance tax, whose upper brackets run far above these levels in all three regions.
The clawback period is now five years everywhere
A gift of movable assets can avoid registration — and therefore gift tax — through a hand gift or a bank transfer gift. The price of that saving is a bet on the donor's survival: if the donor dies before the statutory period expires, the assets fall back into the taxable estate. That period has just been aligned across the country.
Wallonia moved to five years on 1 January 2022, Flanders on 1 January 2025, and the Brussels-Capital Region applies it to gifts made from 1 January 2026 — earlier Brussels gifts remain under the former three-year rule. Since this year, the same rule applies throughout Belgium.
Leaving a gift unregistered means trading a certain 3% cost against a five-year exposure to inheritance rates. On assets passing in direct line, the gap between the two outcomes runs into tens of thousands of euros per bracket. Voluntary registration is not an expense; it is an insurance premium whose rate is known in advance.
What the Flemish tax authority closed off
The société simple was widely used to neutralise article 2.7.1.0.7 of the Flemish Tax Code, which presumes a taxable gift where an asset was acquired in usufruct by the deceased and in bare ownership by the heirs. Vlabel responded with a series of administrative positions, among them position no. 20067 of 21 June 2021 — worth reading closely.
Where the units are split — usufruct with the parent, bare ownership with the children — and the general meeting decides not to distribute income, that income escapes the presumption of article 2.7.1.0.7; but the decision not to distribute is recharacterised as an indirect gift from the usufructuary to the bare owners, caught this time by article 2.7.1.0.5 of the Flemish Tax Code. The door was shut on one side and reopened on the other.
Two practical lessons. The distribution policy of a split-ownership structure is not a neutral management choice: it carries a direct tax consequence. And an arrangement built on a purely tax motive runs into the general anti-abuse provision — article 344, §1 of the Belgian Income Tax Code on the income tax side, its regional equivalent on registration and inheritance duties. A family objective documented in the articles is not a box-ticking exercise.
What the structure actually costs
Three obligations, usually discovered late.
Liability. Partners are personally and jointly liable for commitments entered into on the structure's behalf: a creditor can claim the whole amount from whichever partner is most solvent, leaving that partner to recover from the others. It is the exact opposite of an SRL. Contractual and statutory adjustments exist, but only bind a counterparty who accepts them.
Visibility. Since 2018 the société simple registers with the Crossroads Bank for Enterprises and files its ultimate beneficial owners in the UBO register — anyone holding more than 25% of voting rights or capital, with annual confirmation and updates within a month of any change. The composition and value of the assets are not filed there, but the discretion that formed part of the appeal is gone.
Accounting. The structure keeps accounts and draws up annual accounts: simplified accounting where turnover for the last closed financial year does not exceed €500,000, double-entry accounting above that. Those accounts are filed nowhere — neither with the National Bank nor with the court registry.
The société simple answers a control question, not a tax question. If the aim is to cut an annual tax charge, it serves no purpose. If the aim is to transfer now while keeping decisions in hand to the end, it is one of the few instruments that allow it at a known tax cost.
The collection as a special case
With artworks, three points deserve handling before signature.
Valuation. It sets the base for gift tax and, in an audit, the ground on which the discussion happens. A dated independent appraisal, piece by piece, is worth more than a global figure estimated in-house.
Proof of contribution. Bringing a work into the structure means demonstrating you owned it. Invoice in your name, certificate of authenticity, provenance history, insurance policy: those are gathered at purchase, not ten years later.
Enjoyment. The canvases often stay on the wall at the managing parent's home while bare ownership of the units already sits with the children. Use, insurance, upkeep, loans to an institution: set this out expressly, or feed a later argument about who really had the benefit of the asset.
Frequently asked questions
Does a Belgian société simple pay corporate income tax?
No. Article 1:5, §1 of the Belgian Code of Companies and Associations defines the société simple as a company without legal personality, and an entity without legal personality falls outside both corporate income tax and the tax on legal entities. Income generated by the assets contributed is taxed in the hands of the partners themselves, according to the agreed allocation key and according to its own character: withholding tax on dividends from a securities portfolio, property income for a building, and nothing at all for an artwork that produces no income.
What gift tax applies to units in a société simple?
Units in a movable société simple are movable assets, so a registered gift attracts the flat movable rate: 3% in direct line in the Flemish Region and the Brussels-Capital Region, and 3.3% in the Walloon Region, whatever the amount given. Outside the direct line the rate is 7% in Flanders and Brussels and 5.5% in Wallonia. An unregistered gift remains possible, but the assets return to the estate if the donor dies within five years.
Does a société simple protect the partners' personal assets?
It does the opposite. Because the structure has no legal personality, partners are personally and jointly liable for debts incurred on its behalf, and a creditor may claim the full amount from whichever partner is most solvent. It is a control and governance vehicle, not a liability shield: where asset protection is the main objective, a company that does have legal personality answers the question better.
The first meeting is there to check whether the problem really is a control problem — and to say so if it is not.