Belgium's Five-Corner Model Explained: How the 2028 E-Reporting Proposal Extends Peppol
Belgium's Peppol e-invoicing mandate uses a four-corner model. A pre-draft law approved 18 July 2026 would add a fifth corner — the tax authority — from 2028. Here's what changes.
Belgium's Five-Corner Model Explained: How the 2028 E-Reporting Proposal Extends Peppol
Belgium's live B2B e-invoicing mandate runs on Peppol's four-corner model. A pre-draft law approved by the Belgian Cabinet on 18 July 2026 would extend that architecture with a fifth corner — routing invoice data to the tax authority — from 1 January 2028. If you've already set up Peppol for the current mandate, here's what the fifth corner actually adds, and what stays the same.
For the full compliance picture, see our Belgium e-invoicing complete guide and the 2026 updates timeline.
The Four-Corner Model Belgium Runs Today
Since 1 January 2026, Belgian B2B e-invoicing has run on Peppol's standard four-corner exchange:
- Corner 1 — the seller, issuing the invoice from their accounting or ERP system
- Corner 2 — the seller's Peppol Access Point, which formats and transmits the invoice
- Corner 3 — the buyer's Peppol Access Point, which receives and delivers it
- Corner 4 — the buyer, receiving a structured UBL 2.1 invoice (Peppol BIS Billing 3.0) directly into their system
This model moves the invoice between the two trading parties. It does not send a copy to the tax authority — Belgium's tax administration (FPS Finance) currently has no automatic visibility into individual invoice content through this network.
What the Fifth Corner Adds
The pre-draft law approved by Cabinet on 18 July 2026 introduces a fifth corner: the tax authority itself, receiving a near-real-time copy of key invoice data alongside the existing seller-to-buyer exchange. This is the Peppol five-corner model, sometimes called Peppol CTC (Continuous Transaction Controls), already used or planned in some form in several EU countries. In practice:
- Corners 1–4 continue to work exactly as they do today — the seller-to-buyer invoice exchange doesn't change
- A structured data extract from the same invoice is additionally routed to FPS Finance, close to the time of the transaction, rather than reported later on a periodic return
- The exact data fields and technical routing (whether via the seller's or buyer's Access Point, or a separate channel) are still being finalized in the draft legislation
Why Belgium Is Adding This
Belgium's current mandate proves invoices are being exchanged in a structured, EN 16931-compliant format — but proving exchange isn't the same as giving the tax authority transaction-level data automatically. The proposal also abolishes the annual client listing (the yearly summary of B2B customers and totals VAT-registered businesses currently file), on the logic that once transaction data flows to FPS Finance continuously, an annual summary duplicates information the authority already has.
The move also anticipates the direction of the EU's ViDA (VAT in the Digital Age) package, which will require digital reporting for cross-border intra-EU B2B transactions from 1 July 2030. Poland's KSeF already combines invoicing and reporting in a single system from day one; Belgium's phased approach — invoicing first, reporting layered on later — is a different sequencing of the same eventual destination.
Status: Pre-Draft, Not Law
It's worth being precise about where this sits in the legislative process. As of this writing, the text is a pre-draft law (avant-projet de loi / voorontwerp van wet) approved by the Council of Ministers — it has been sent to Belgium's Data Protection Authority and Council of State for their opinions, and still needs a second Cabinet reading and adoption by the Chamber of Representatives before it becomes binding. Publication is expected in autumn 2026, with detailed technical rules to follow by Royal Decree in early 2027. The 1 January 2028 date, and the exact scope of reportable data, could still change.
Timeline
| Date | Milestone |
|---|---|
| 1 January 2026 | Four-corner Peppol B2B e-invoicing mandatory |
| 1 April 2026 | Full enforcement; graduated penalties apply |
| 18 July 2026 | Cabinet approves pre-draft five-corner e-reporting law |
| Autumn 2026 (expected) | Pre-draft submitted to Parliament |
| Early 2027 (expected) | Implementing Royal Decree with technical detail |
| 1 January 2028 (proposed) | Five-corner e-reporting takes effect; annual client listing abolished |
| 1 July 2030 | EU ViDA cross-border digital reporting requirements begin |
What Belgian Businesses Should Do Now
If your current Peppol setup already handles the four-corner exchange correctly, you have a head start — the fifth corner is an additional reporting layer on the same infrastructure, not a replacement for it. There's nothing to implement yet: the law hasn't been adopted, and the technical specification for what gets reported and how isn't final. The practical step today is simply to track the pre-draft's progress through Parliament rather than budgeting engineering time against a 2028 date that could still shift.
Source
News.belgium.be, Instauration de l'obligation de rapportage électronique des données de facturation, Council of Ministers press release, 18 July 2026.
Last updated: September 2026. This tracks a pre-draft law that has not yet been adopted by Parliament — confirm current status via FPS Finance before making implementation decisions.