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With just a few weeks to go until the 1 January 2026 e-invoicing mandate, the Q4 results of the ITAA survey show that the Belgian accountancy sector has made clear progress. What started as a period of planning in the spring has turned into real action in the second half of 2025.
Here are three encouraging trends that show accountants, tax advisors and entrepreneurs are well on their way for the final stretch toward 2026.
1. E-invoicing adoption is picking up speed
The shift to e-invoicing is clearly accelerating. In Q2, almost 60% of accountancy firms said that less than a quarter of their clients were ready. By Q4, that number had dropped to 38.3%.
On the positive side, the number of firms where more than 75% of clients are prepared has almost doubled, from 9.3% in Q2 to 18.3% in Q4.
This increase shows that accountants and tax advisors have stepped up their client support, more entrepreneurs are taking action themselves, and the sector has clearly moved from planning to actual implementation.
2. More firms now have a concrete communication plan
Communication is proving to be one of the strongest assets for accountants and tax advisors during this transition.
In Q2, 65.6% of firms already had a communication plan in place, but by Q4 this increased to 79.7%. This means that most firms are now informing their clients in a structured way about the obligations, deadlines, and practical steps they need to take.
The report shows that communication plans have become more refined, more clients are being informed on time, and communication is no longer ad hoc but thoughtful and proactive.
This not only increases the chances of a smooth and timely transition, but also strengthens the accountant’s role as a trusted advisor.
3. Looking ahead
Preparations are no longer limited to the implementation of e-invoicing alone. The report shows that 55.9% of accountants and tax advisors want to choose a solution that is ready for e-reporting, the next step in the digitalisation of tax processes.
This growing preference shows that firms are not just reacting to the 2026 obligation, but are thinking strategically about the broader digital transformation and preparing for new requirements that are coming next. It also confirms that many accountants and tax advisors see e-invoicing as the beginning, not the end point.
What does this tell us?
The overall trend is clear: the Belgian accountancy sector is moving in the right direction.
Most firms are actively supporting their clients, rolling out solutions, and investing in clear communication. Not everyone is fully ready yet, but the numbers show that the sector has made strong progress throughout 2025.
The coming weeks will still be important, but the foundation is there and that’s a positive sign for both accountants and entrepreneurs.
Download the full report
Want to explore all insights, graphs and details? Want to explore all insights, graphs and details? The full report is available in both Dutch and French.