Key takeaways
- The registered office is the company's single legal address; the unit of establishment is a place of activity, identifiable by an address, where the business operates.
- A company has only one registered office, but zero, one or several units of establishment, each with its own number in the CBE.
- The registered office may be based at an address with no activity carried out there; the unit of establishment, for its part, requires a real activity on site.
- The tax address coincides in practice with the registered office, but designates a distinct function: the tax administration's point of contact.
A single Belgian company juggles several addresses with similar-sounding names: registered office, statutory seat, unit of establishment, tax address, place of operation. They are easily confused, and the confusion is costly: an undeclared unit of establishment is an irregularity, a misunderstood office makes a procedure fail. The distinction between registered office and unit of establishment is the most structuring, because it governs the way the company is registered with the Crossroads Bank for Enterprises (CBE). This article defines each notion precisely, shows how they articulate, and runs through a concrete example to fix the ideas.
The registered office: the company's single statutory address
The registered office, also called the statutory seat, is the company's official legal address. It is the address recorded in the articles, published in the annexes to the Moniteur belge at incorporation, then registered with the CBE. The Companies and Associations Code (CAC) requires every company it governs to have its statutory seat in Belgium: it is the criterion that attaches the company to Belgian law and determines which court hears its disputes.
Two properties of the registered office are to be remembered. First, it is single: a company has one and only one statutory seat at a given moment. Second, it is not necessarily a place of activity. The CAC does not require the office to be a commercial or production premises; it may be a residential address or the address of a business-address provider, as long as it corresponds to a real physical location. PO boxes and fictitious addresses are excluded.
It is precisely because the office can be dissociated from the workplace that the business address exists: it consists of establishing the registered office at a provider's address, while carrying out the activity elsewhere. The choice between a private home and a business address for this office is dealt with in detail in our article business address or home.
The unit of establishment: each place where the activity is carried out
The unit of establishment answers another question: where does the company actually work? The FPS Economy, which manages the CBE, gives it a precise definition.
Unlike the registered office, the unit of establishment is not single. A company may have zero, one or several. An asset or holding company with no physical presence may declare none. A self-employed person operating from a single premises will have one. A retail chain operating five points of sale will declare five. Each unit of establishment receives its own ten-digit number, whose first digit is between 2 and 8, distinct from the enterprise number. The detail of this numbering is developed in our guide to the Crossroads Bank for Enterprises.
Declaring a unit of establishment goes through an approved enterprise counter, which charges a registration fee per unit, set by royal decree and indexed every year (the 2026 indexed tariff is around 111.50 € per unit of establishment). This amount is regulated, so identical from one counter to another.
Registered office, unit of establishment and tax address compared
Three notions come up constantly and deserve to be placed side by side. The tax address is the place to which the tax administration sends its correspondence and notifications to the taxpayer. For a natural person, it coincides with the home. For a company, the administration starts from the CBE registration, which flows from the registered office: in practice, a company's tax address is therefore that of its office, unless a particular situation is declared to the FPS Finance.
| Registered office | Unit of establishment | Tax address | |
|---|---|---|---|
| Definition | Company's statutory address | Place where an activity is carried out | Tax administration's point of contact |
| Possible number | only one | zero, one or several | only one |
| Main role | Legal attachment, articles | Locate the real activity | Receive tax notifications |
| Registration with the CBE | |||
| Requires an activity on site |
The "registration with the CBE" line deserves a nuance: the registered office and the units of establishment are data recorded as such in the Crossroads Bank for Enterprises, whereas the tax address is not a separate item of the register, it is deduced from the office.
Place of operation, place of business and commercial unit
Three other terms circulate, often as approximate synonyms of the unit of establishment. Clarifying them avoids misunderstandings.
The place of operation (or place of business) designates, in common language, the place where the company actually deploys its activity. It is the economic reality that the administrative notion of unit of establishment records in the CBE. A company whose office is in Brussels and which runs a shop in Antwerp has its place of operation in Antwerp, a place that will be declared as a unit of establishment.
The commercial unit emphasises the sales activity: a shop, an online point of sale, a restaurant. It is an economic angle, not a legal category of the CBE. In the register, this point of sale is, again, a unit of establishment.
A concrete example to fix the notions
Take an SRL active in coffee roasting. Its address structure illustrates how these notions fit together.
The addresses of the SRL 'Café du Quai'
Registered office, in Brussels
Based at a provider registered with the FPS Economy. No roasting activity takes place there: it is the statutory address and the administrative point of contact.
First unit of establishment, in Liège
The roasting workshop, where production actually takes place. Declared with the CBE with its own unit-of-establishment number, whose first digit runs from 2 to 8.
Second unit of establishment, in Namur
The shop selling to the public. A second place of activity, hence a second unit of establishment declared, distinct from the workshop.
Tax address
That of the Brussels registered office: it is there that the tax administration sends its correspondence to the company.
A single company, therefore a single enterprise number and a single registered office, but two units of establishment because the activity is physically carried out on two sites. The office, for its part, corresponds to no material activity: it is based at a provider. If the company opened a third point of sale, it would declare a third unit of establishment, without touching its office. And if it moved its statutory seat, it would be a transfer of the registered office, a step distinct from the opening or closing of a unit of establishment.
A professional registered office, distinct from your places of activity
Monsiegesocial bases your company's registered office at a provider registered with the FPS Economy, while your activity is carried out wherever you wish.
Why the distinction matters day to day
Properly distinguishing these notions is not a theoretical exercise. A unit of establishment left undeclared while an activity is carried out there is an irregularity, punishable during an audit. Conversely, confusing the registered office with a place of activity leads to recording a residential address where a business address would have protected the director's privacy. Every change, opening of a site, closing of another, relocation of the office, follows its own procedure and is declared to the CBE within the month, generally via an approved enterprise counter.
The practical rule comes down to one sentence: the registered office is the company's address, the unit of establishment is the address of each of its activities, and the tax address is, for a company, that of its office. Keeping these three functions separate in your mind is enough to avoid most administrative errors.
Going further
- Business address or home: which registered office to choose, to decide where to fix your statutory seat
- Crossroads Bank for Enterprises (CBE): the complete guide, to understand the enterprise and unit-of-establishment numbers
- Transfer of the registered office in Belgium, to know how to change the statutory address
- Business address in Brussels: the complete guide, to base an office in the capital
