Guide

Accounting firms: monitoring Belgian client companies

A firm knows its files on the day it opens them. Between two year-ends, life goes on — and it gets published. Here is what to follow, where, and how to organise so that nothing is missed.

Updated 11 Nov 2026 · 6 min read · Published by Idonis (Vanbe SRL) · About

A firm that handles a hundred files knows each of them — on the day it opens them. Between two year-ends, life goes on: a client changes manager, a client's supplier files its accounts late, a group company appears in the Belgian Official Gazette. Nobody reads the Gazette every morning for a hundred enterprise numbers. The same goes for a foreign firm or a group finance team that follows Belgian subsidiaries, customers or suppliers.

Your firm Clients filing deadlines,publications, directors Counterparties large customer, supplier,sister company Group cross directorships,holdings, guarantees
One firm, three lists: what is published on each calls for a different response.

Step by step: where to look, what to read

1

What is published about your clients without you knowing

Where: register, Central Balance Sheet Office, Official Gazette
  • In the register (CBE): name, registered office, activities, establishment units, legal status.
  • At the Central Balance Sheet Office: the filing of the accounts — and above all its absence. Once the seven-month deadline has passed, every day counts for the directors' liability.
  • In the Official Gazette: appointments and resignations, registered office transfers, changes to the articles of association, dissolutions, court rulings. These publications often reveal that a client took a decision without telling you.
2

The three lists a firm should keep

List 1ClientsSo that no filing deadline is missed and every publication that concerns them is seen.
List 2Important counterpartiesThe large supplier, the main customer, the sister company: when it wobbles, your client is exposed — and you are the one it will call.
List 3Companies of the same groupCross directorships, holdings, guarantees: a change at one affects the others, and the consolidation.
3

What to look at with each signal

A filing of accounts: has equity changed sign? Does the alarm-bell procedure of the Code of Companies and Associations apply (art. 5:153 for the BV/SRL, 7:228 for the NV/SA)? Late filing by a counterparty: is your client's exposure to it covered? A publication in the Official Gazette: an appointment, resignation or office transfer changes who can bind the company — and therefore who signs the documents you prepare.

4

Getting organised: from one-off checks to monitoring

A one-off check works well by hand when it is occasional. Monitoring a hundred companies does not: you need a list, a source that reads each publication, and a signal that only arrives when something has changed. The public searches offer no alerts; that is precisely where a tool takes over — without replacing your reading.

Setting up monitoring for the firm

  • A clients list, by enterprise number, with each one's year-end.
  • A counterparties list, fed with each file (large customer, key supplier).
  • A group list for structures with several companies.
  • A signal at each filing, delay or publication — not a weekly report to read in full.
  • A written response per type of signal (who calls, what to check).

Frequently asked questions

Can the Belgian Official Gazette be followed for a list of companies?

The Gazette annexes are searched by enterprise number, one company at a time; there is no built-in alert. Following a list requires a tool that reads the publications and flags what is new.

What does Belgian law say when equity becomes negative?

The Code of Companies and Associations requires the management body to call the general meeting and propose measures (the alarm-bell procedure: art. 5:153 for the BV/SRL, 7:228 for the NV/SA). Filing the accounts makes the situation visible to everyone.

Why follow my clients' counterparties?

Because that is where bad surprises come from: a large customer of your client that files late or changes directors is a risk for your client — and a question your client will ask you.

With Idonis

Your files in lists, a signal at each publication

Create one list per portfolio — clients, counterparties, group — and let Idonis read every filing of accounts and every Gazette publication. You get a signal when something changes, with the full company page one click away; the judgement stays yours.

No sign-up. Every Belgian company, from official sources.

Sources of the publications cited: company register (CBE), filed annual accounts (NBB — Central Balance Sheet Office), Belgian Gazette. This guide is general information, not advice for a specific case. How the soundness score is computed

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