Accounting is the foundation of every financial and tax decision. Our teams handle the full management of your accounts, from the paperless processing of documents to the preparation of the annual accounts, including all of your reporting obligations: VAT returns, customer listings, corporate income tax and personal income tax returns, interim statements and statutory filings. We also ensure your regulatory compliance: UBO register, anti-money laundering (AML) obligations, structured electronic invoicing. All within a 100 % digital framework: your documents flow through our My Catalyst platform, are processed continuously, and feed reporting that you can consult whenever you wish.

• Core accounting obligations Keeping or supervising your accounts, filing periodic tax returns, preparing annual accounts and publications, dashboards, VAT or tax audit assistance, and accounting support during key corporate moments.
• Accounting year rhythm Documents are processed on a rolling basis, VAT returns are filed on time, a mid-year interim statement gives perspective, and the annual closing becomes a real review meeting.
• Interim review The contractual interim statement helps analyse results, anticipate your tax burden and prepare decisions for the following year: remuneration, investments, distribution.
• File takeover When we take over a file during the year, we organise the transition with your former firm, recover historical data, bring the file up to standard where needed and ensure continuity.

Your accounting must meet three requirements. Compliance first: Belgian obligations are numerous, the deadlines strict and the penalties very real. Reliability next: erroneous or late figures distort your pricing, investment and hiring decisions. Efficiency last: every hour spent chasing documents is an hour lost to your business or your family life. To these challenges is added a major transformation: structured electronic invoicing, mandatory between Belgian businesses since 1 January 2026, which requires rethinking invoicing flows and their accounting integration.

We believe in continuous accounting rather than processing in fits and starts. Your documents are collected paperlessly on a rolling basis, processed regularly, and your figures are available at all times. Each file is entrusted to a dedicated expert whom you know, whom you can meet in one of our offices, and who knows your history. This single point of contact draws on a multidisciplinary team — accountants, tax advisors, HR and financial advisors — to give you the right advice at the right time, without you having to juggle multiple providers.

• Medical and liberal professions
• Management companies
• Holdings and asset-holding companies
• Growing start-ups
• Non-profit organisations (ASBL/AISBL)
• International structures
• Self-employed professionals
• Analytical accounting
• Consolidations
• Standard conversions
• File takeover and compliance remediation

• Time saved: Digital collection and continuous processing eliminate the end-of-month and end-of-quarter rush.
• Visibility: Up-to-date figures let you steer the business rather than merely observe it.
• Peace of mind: Obligations are anticipated, deadlines are met and compliance is secured.
• Relevant advice: Because your figures are reliable, the tax and strategic advice built on them is reliable too.

Catalyst is an ITAA-accredited firm, a member of the international network Integra International, present in Brussels (Erasme, Louise, Montgomery) and in Walloon Brabant (Waterloo). Our partners combine several decades of experience serving the self-employed, liberal and medical professions, SMEs and growing groups.

Our conviction: accounting is not an administrative formality, it is the raw material of all your good decisions. That is why we have made it continuous, digital and human all at once.