Contrôle fiscal en Belgique ? Voici comment vous préparer (et rester serein)

Receiving a tax audit notice triggers immediate anxiety for most business owners. But here's the reality: if your accounting is well-maintained and your filings are accurate, an audit is typically a verification exercise — not an inquisition. Belgium's tax administration has become increasingly data-driven, using algorithms to cross-check VAT returns, income declarations, and social data. Here's exactly what to expect and how to handle it.

The Audit Process: Step by Step

1. You Receive a Request for Information

Most audits start with a digital questionnaire or formal letter requesting specific documents: books, invoices, bank statements, contracts. You generally have one month to respond. Read the letter carefully: identify the period under review, the taxes concerned (VAT, income tax, corporate tax), and the exact documents requested.

Do: Respond within the deadline. If you need more time, request an extension with a valid reason — these are usually granted.

Don't: Volunteer documents that weren't requested. Respond only to what was asked.

2. Possible On-Site Visit

The tax authorities may visit your premises. They can:

• Enter professional premises during business hours
• Inspect and copy books, invoices, electronic documents, and emails
• Interview employees and directors
• Access digital data and business email accounts

They cannot:

• Enter private residences without consent or a Police Court warrant
• Access privileged communications (lawyer/accountant correspondence)
• Conduct "fishing expeditions" — they must have a concrete, legitimate purpose
• Compel passwords or break locks

3. The Outcome

You'll receive one of:

• Statement of Findings: Factual observations, not yet a tax adjustment.
• Proposed Adjustment (Proposition de rectification): The administration proposes to modify your tax return. You have 30 days to reply. If you agree, sign it. If you disagree, respond in writing with evidence.
• Tax Assessment Notice: The official tax bill. You can file an administrative appeal within 1 year (preferably within 2 months to suspend enforcement).

Your Rights as a Taxpayer

• No fishing expeditions. The administration must have concrete indications.
• Professional privilege. Communications with your lawyer and accountant are protected.
• Right to be heard. You may request an oral hearing during an administrative appeal.
• Right to rectify. A 2025 reform proposes allowing good-faith corrections without penalties.
• Burden of proof. A timely, complete return is presumed correct. The administration must prove facts justifying an adjustment — but you must prove your deductible expenses.

How to Prepare (Year-Round)

1. Keep business and private transactions strictly separate (separate bank accounts).
2. Maintain digital, structured, transparent accounting. Keep records for at least 7–10 years.
3. Attach supporting documents to every expense.
4. Review VAT returns before submission — inconsistencies are a primary audit trigger.
5. Have a professional accountant review your accounts regularly. Clients under ongoing professional management are audited significantly less often because their filings are thorough and consistent.

When the Audit Letter Arrives

1. Contact your accountant immediately. This is not the time to handle things alone.
2. Read the letter meticulously — period, taxes, documents, deadline.
3. Gather only what is requested. Do not volunteer extra documents.
4. Double-check consistency before submitting anything.
5. Keep all communication in writing. Stay polite and factual.
6. If an on-site visit occurs: have your accountant or legal counsel present.

The most important advice: Never ignore an audit notice. An unanswered Proposed Adjustment becomes an ex officio tax assessment — shifting the burden of proof to you. Respond within the 30-day window, with your accountant's support.

At Kalinowska, we represent clients through the entire audit process — from the initial document request through to negotiation with the tax authorities and, if necessary, administrative and judicial appeals. Clients under our ongoing management are rarely audited precisely because our filings are thorough, consistent, and compliant. If you've received an audit notice or want to ensure you're audit-ready, book a free consultation.