The next big wave for Belgian invoicing is already here — and it starts on 1 January 2028
Eighteen months ago, Belgian zelfstandigi and companies scrambled to comply with the PEPPOL BIS 3.0 mandate that entered into force on 1 January 2026. Most of us who run our own business had to learn a new acronym, adapt to structured invoicing, and update our software.
Now the second wave is on the horizon: e-Reporting via the Peppol 5-corner model, which becomes operational on 1 January 2028. Unlike the 2026 mandate, this one changes something deeper — the way the Belgian tax authority (FPS Finance / FOD Financiën / SPF Finances) receives information about your invoices.
Here is what you need to know now, so you are not caught scrambling in December 2027.
What is the Peppol 5-corner model, in one sentence?
Currently, PEPPOL uses a 4-corner architecture: sender → sender's access point → recipient's access point → recipient. On 1 January 2028, Belgium adds a fifth corner: the tax authority. When you emit an invoice via PEPPOL, a copy of the invoice data is transmitted in real time (or near-real-time) to FPS Finance as part of Continuous Transaction Controls (CTC).
In practice, this means: the tax authority will know about your invoice within minutes of you sending it. Not at the end of the quarter, when you file your VAT return. Immediately.
Who is affected?
All Belgian VAT-registered businesses that emit or receive B2B invoices. In practice:
- Zelfstandigi/independents — all of us, regardless of turnover
- SMEs — from micro to mid-sized
- Large enterprises — already have compliance infrastructure, will adapt easily
- Accountants and tax advisors — must ensure all clients are ready by end of 2027
The mandate applies uniformly. There is no exemption threshold like there used to be for small businesses in the 2026 mandate rollout.
What changes for you as a zelfstandige
Fewer periodic reports
The current annual customer listing (jaarlijkse klantenlisting / listing annuel des clients) will most likely be eliminated for taxpayers using the 5-corner PEPPOL flow. The tax authority already knows who your B2B customers are, in real time. Filing a duplicate list once a year becomes redundant.
Faster VAT reconciliation
Because both sales and purchases flow through the same PEPPOL network with tax authority visibility, your quarterly VAT return becomes a matter of confirmation rather than declaration. Your accountant can prepare it in minutes instead of days.
Reduced fraud tolerance
The tax authority will have real-time visibility into invoicing patterns across the entire economy. Detection of missing-trader fraud, VAT carousel schemes, and other tax evasion becomes automated and near-instantaneous. Legitimate zelfstandigi have nothing to fear — but the era of "creative" invoicing practices ends completely.
Better cash flow tracking
Software integrated with the 5-corner model will show you real-time overdue invoices, payment reconciliation, and cash flow projections based on actual transaction data — not estimates.
What you need to do in 2026-2027
Nothing radical needs to change immediately. But here is a sensible 18-month roadmap:
Q3-Q4 2026 (now)
- Ensure your current invoicing software provider has publicly committed to 5-corner support by 2028. If they haven't, start evaluating alternatives.
- Verify that all your recurring B2B customers are PEPPOL-registered (they should be by now, after 20+ months of mandate).
- Talk to your accountant about their preparation timeline.
Q1-Q2 2027
- FPS Finance is expected to publish detailed technical specifications during this window.
- Your software provider should be implementing the technical layer.
- Beta testing with early access to the 5-corner infrastructure will likely be available.
Q3-Q4 2027
- Test your workflow end-to-end.
- Verify that a test invoice successfully transmits both to your customer AND to FPS Finance.
- Update internal documentation and processes.
1 January 2028
- Mandate takes effect.
- A tolerance period of 3-6 months is likely, based on precedent from the 2026 mandate.
- Real enforcement (fines, penalties) probably begins Q3-Q4 2028.
What happens if I ignore the deadline?
Realistically, ignoring the 2028 mandate is more consequential than ignoring the 2026 one. Reasons:
- Real-time detection. Non-compliance is visible instantly, not at year-end audit.
- Higher fines expected. The 2026 mandate started with soft penalties (warnings, small fines). By 2028, the tolerance for non-compliance will be much lower, since businesses have had 24+ months to prepare.
- Business risk. B2B customers will refuse to work with suppliers who cannot provide compliant e-invoices. You risk losing contracts.
How DEMFACT is preparing
At DEMFACT we are already tracking the technical publications from FPS Finance and preparing our infrastructure. Our roadmap:
- Q1 2027: Technical implementation of the 5-corner submission layer as soon as specifications are finalized
- Q2 2027: Beta testing with existing users
- Q3 2027: Public rollout with visual dashboard showing real-time reporting status per invoice
- Q4 2027: Full production readiness for all customers, ahead of the January 2028 deadline
Users on DEMFACT will not have to do anything special. When you emit an invoice via PEPPOL on 2 January 2028, the 5-corner transmission to FPS Finance will happen automatically in the background. You will see a green checkmark in your dashboard confirming the tax authority has received the data.
What to do this week
If you already use DEMFACT: nothing. You will be ready.
If you use another invoicing platform: ask them directly (in writing, so you have proof) whether they have committed to Peppol 5-corner readiness by 1 January 2028. If the answer is unclear or evasive, start looking at alternatives while you still have 18 months.
If you still emit paper or PDF invoices: you are not compliant with the 2026 mandate either. This should already be your priority. Create a free DEMFACT account and get compliant in an afternoon.
Bottom line
The 2026 PEPPOL mandate changed how invoices are transmitted between businesses. The 2028 e-Reporting mandate changes how the tax authority sees them. Two waves, two different problems, one platform (yours) needs to handle both.
You have 18 months. Use them.