E-Invoicing in Belgium 2026: Complete Guide to the Peppol B2B Mandate
Belgium's B2B e-invoicing mandate explained: who must comply, Peppol BIS 3.0 format rules, penalties since April 2026, and what's coming in 2028.
E-Invoicing in Belgium 2026: Complete Guide to the Peppol B2B Mandate
Belgium runs one of the strictest B2B e-invoicing mandates in the EU: no turnover threshold, no phase-in by company size, no grace period for new businesses. If you're VAT-registered and established in Belgium, the mandate has applied to you since 1 January 2026 — and since 1 April 2026, non-compliance carries real fines.
This guide covers who's affected, which format to use, where the deadlines actually stand today, and what's coming next.
The Legal Basis
Belgium's B2B mandate rests on the Act of 6 February 2024, which amends the Belgian VAT Code and the Income Tax Code 1992 to require structured electronic invoicing for domestic B2B transactions. It builds on infrastructure Belgium already had in place for B2G invoicing: the federal law on public procurement of 7 April 2019 (transposing EU Directive 2014/55/EU) first required structured e-invoices from federal government suppliers, with the requirement phased in down to contracts as small as €3,000 by November 2023.
The B2B mandate is administered by FPS Finance (SPF Finances / FOD Financiën).
Who Must Comply
The mandate applies to businesses established in Belgium, or with a permanent establishment there, that are registered for Belgian VAT. It covers domestic B2B transactions — invoices issued between two Belgian-established VAT payers.
Foreign businesses that hold only a Belgian VAT number, without an actual establishment in Belgium, fall outside the domestic B2B mandate's scope. There is currently no B2C mandate — invoices to consumers are unaffected.
Unlike Germany's phased 2025–2028 rollout or Poland's size-based KSeF phase-in, Belgium applied the mandate to every VAT-registered business at once, with no minimum invoice value and no exemption for small businesses.
Required Format: Peppol BIS 3.0
Invoices must be EN 16931-compliant structured documents — in practice, Peppol BIS Billing 3.0, based on UBL 2.1 (CII 16B is also technically permitted under the EN 16931 standard, though UBL 2.1 via Peppol BIS is the format actually used in practice). They must be exchanged over the Peppol network using the four-corner model: your invoicing software or access point (corner 2) sends the invoice through the Peppol network to your customer's access point (corner 3), which delivers it into their system (corner 4).
Hybrid formats like Factur-X and ZUGFeRD are recognised for specific cross-border use cases — relevant if you also trade with France or Germany — but Peppol BIS 3.0 is the reference format for domestic Belgian B2B invoicing.
Already using Peppol for German or Dutch invoicing? The same connection typically extends to Belgium without a separate integration — see our software comparison for Peppol access points that cover multiple countries.
Timeline: Where Things Stand
| Date | Milestone |
|---|---|
| 7 April 2019 | Federal public procurement law transposes B2G e-invoicing directive |
| 1 Nov 2022 – 1 Nov 2023 | B2G e-invoicing phased in for federal contracts down to €3,000 |
| 6 Feb 2024 | Act establishing the B2B mandate adopted |
| 1 January 2026 | B2B e-invoicing mandatory — all VAT-registered businesses, no threshold |
| 1 Jan – 31 Mar 2026 | Administrative tolerance period (no penalties for good-faith non-compliance) |
| 1 April 2026 | Full enforcement begins — graduated penalties apply |
| End of June 2026 | Extended tolerance period for self-billing invoices ends |
| 1 January 2028 (proposed) | Near-real-time e-reporting via Peppol five-corner network |
| 1 July 2030 | EU ViDA cross-border B2B digital reporting (EU-wide) |
For the details behind the April 2026 enforcement date and the 2028 proposal, see our news coverage: grace period ends, fines apply and near-real-time e-reporting proposed for 2028.
Penalties for Non-Compliance
Since 1 April 2026, non-compliance can trigger graduated administrative fines:
- €1,500 — first infringement
- €3,000 — second infringement within 3 months
- €5,000 — third and subsequent infringements within 3 months
The obligation — and the fine — applies to both sending and receiving e-invoices via Peppol. If your business can't technically process an incoming structured invoice, you're in scope for the penalty regime too, not just the sender.
What's Next: E-Reporting from 2028
On 18 July 2026, Belgium's Cabinet approved a pre-draft law that would add a near-real-time e-reporting layer on top of the existing invoicing mandate from 1 January 2028, using a Peppol five-corner model to route transaction data to the tax authority close to the time of invoicing. It would also abolish the annual client listing (the yearly B2B customer summary businesses currently file). This is not yet enacted — the date and scope could still change as it moves through Parliament.
Separately, the EU's ViDA (VAT in the Digital Age) package requires structured e-invoicing and digital reporting for cross-border intra-EU B2B transactions from 1 July 2030, layering an EU-wide requirement on top of Belgium's domestic rules.
Frequently Asked Questions
Q: Is there a small business exemption? A: No. Belgium's mandate applies to every VAT-registered business established in Belgium, regardless of size or invoice volume.
Q: What if I only invoice Belgian consumers, not businesses? A: B2C invoicing is not covered by this mandate. Only B2B (business-to-business) domestic transactions are in scope.
Q: Can I still send a PDF invoice? A: No — a PDF alone doesn't meet the structured-data requirement. Some software can generate a human-readable PDF alongside the underlying Peppol BIS 3.0/UBL 2.1 XML, but the structured file is what makes the invoice compliant.
Q: Does the mandate cover invoices to foreign businesses? A: No — the current mandate covers domestic B2B transactions between Belgian-established VAT payers. Cross-border intra-EU B2B invoicing will be addressed separately under the EU's ViDA rules from 1 July 2030.
Q: How fast has Belgium adopted Peppol? A: Extremely fast — Belgium's Peppol registrations passed 2.1 million by June 2026, making it the largest national Peppol network in the world. See our Peppol adoption data for the full numbers.
Last updated: August 2026. We track official sources (FPS Finance, the European Commission's eInvoicing knowledge base, and VATupdate) and update this guide when the rules change.