Statutory and voluntary audit services for Belgian companies — we coordinate the full audit process with IBR/IRE-registered auditors and ensure your company meets all legal requirements.
Belgian companies that exceed specific size thresholds — or operate as an NV/SA — must appoint a statutory auditor (commissaris/commissaire). As part of our accounting services in Belgium, LawSupport coordinates the audit process with registered auditors from the IBR/IRE, ensuring your company meets all statutory requirements while minimising disruption to your operations.
When Is a Statutory Audit Required?
Under the Belgian Code of Companies and Associations (CSA/WVV), a statutory auditor is mandatory when a company exceeds two of three thresholds (on average over two consecutive financial years):
Threshold
Amount
Annual turnover (excl. VAT)
€9,000,000
Total assets
€4,500,000
Average number of employees
50
Exception: NV/SA companies must always appoint a statutory auditor, regardless of size. See our NV/SA registration guide for details.
Companies with fewer than 100 employees that exceed the thresholds can appoint a single auditor. Companies with a works council (ondernemingsraad/conseil d'entreprise) must also appoint an auditor regardless of size.
The legally required annual audit of financial statements by an IBR/IRE-registered auditor. The auditor examines the annual accounts to confirm they provide a true and fair view of the company's financial position and issues a formal audit opinion.
Voluntary Audit
Companies below the statutory thresholds may still choose a voluntary audit for:
Investor or shareholder reporting requirements
Bank financing or loan covenants
Parent company / group audit requirements
Acquisition due diligence preparation
Internal governance and risk management
Special Audits
Contribution in kind audit — when non-cash assets are contributed to the company as share capital
Quasi-contribution audit — when the company acquires assets from founders within 2 years of incorporation
Merger/demerger audit — required for corporate restructurings
Liquidation audit — review of financial statements during company dissolution
The Statutory Auditor's Role
A Belgian statutory auditor (bedrijfsrevisor/réviseur d'entreprises) performs the following duties:
Annual audit — examine annual accounts and issue an audit opinion
Report to shareholders — present audit findings at the annual general assembly
Compliance monitoring — verify compliance with the CSA/WVV and articles of association
Alarm bell procedure — alert the board if the company's financial position is seriously threatened
Special reports — issue opinions on specific transactions (contributions in kind, distributions, etc.)
Audit Costs
Company Size
Annual Audit Fee
Small company (just above thresholds)
€3,000 – €8,000
Medium company
€8,000 – €20,000
Large company
€20,000 – €50,000+
NV/SA (mandatory, any size)
€3,000 – €8,000 (small NV/SA)
Audit fees are proposed by the auditor and must be approved by the general assembly. They are fixed for the 3-year mandate period. For annual accounts preparation costs, see our annual accounts filing page.
Appointment Process
Selection — the board proposes an auditor from the IBR/IRE register
General assembly vote — shareholders approve the appointment and audit fee
CBE registration — the appointment is registered with the Crossroads Bank for Enterprises
3-year mandate — the auditor serves for 3 financial years (renewable)
Annual reporting — the auditor presents their report at each annual general assembly
LawSupport assists with auditor selection, coordinates the appointment process, and ensures smooth year-end collaboration between your bookkeeper, tax advisor, and statutory auditor.
A statutory auditor (commissaris/commissaire) is mandatory for Belgian companies that exceed two of three thresholds: annual turnover of €9 million, total assets of €4.5 million, or an annual average of 50 employees. NV/SA companies always require a statutory auditor regardless of size.
Statutory audit fees typically range from €3,000–€8,000/year for small to medium companies, and €10,000–€30,000+ for larger companies. Fees depend on company size, complexity, transaction volume, and the audit firm. The fee must be approved by the general assembly.
Only registered statutory auditors (bedrijfsrevisoren/réviseurs d'entreprises) listed with the IBR/IRE (Institute of Registered Auditors) can perform statutory audits in Belgium. The auditor must be independent and appointed by the general assembly for a renewable 3-year term.
The IBR/IRE (Instituut van de Bedrijfsrevisoren / Institut des Réviseurs d'Entreprises) is the professional body that regulates statutory auditors in Belgium. It maintains the register of approved auditors, sets auditing standards, and conducts quality reviews.
Small BV/SRLs that do not exceed two of the three thresholds (€9M turnover, €4.5M assets, 50 employees) are exempt from mandatory statutory audit. However, voluntary audits are available and may be useful for investor reporting, bank requirements, or internal governance.
The statutory auditor examines the company's annual accounts to verify they give a true and fair view of the company's financial position. They issue an audit opinion (unqualified, qualified, adverse, or disclaimer), report to the general assembly, and monitor compliance with Belgian company law.
A statutory auditor is appointed by the general assembly for a 3-year term, renewable. The appointment must be registered with the Crossroads Bank for Enterprises (KBO/BCE). Early termination requires court approval except in cases of professional misconduct.
The statutory auditor must be registered with the Belgian IBR/IRE. International audit firms (Big 4, mid-tier) operate in Belgium through their local Belgian offices with IBR/IRE-registered partners. A non-Belgian audit firm cannot directly serve as statutory auditor.
Professional Audit Coordination for Your Belgian Company
We connect you with IBR/IRE-registered auditors and manage the full audit process.
