Invoicing compliance in Belgium

Belgium’s mandatory e-invoicing requirements, Peppol implementation, and upcoming e-reporting obligations for B2B and B2G transactions

Belgium's e-invoicing regulation timeline

View current and upcoming regulation →

🇧🇪 Invopop resources for Belgium

Compliance	Invoicing compliance in Belgium Compliance timeline
Apps	Peppol OASIS UBL UN/CEFACT CII
Guides	Peppol Guide Chargebee Guide
FAQ	Belgium FAQ
GOBL	Belgium Tax Regime EN 16931-1:2017 Addon
GitHub	gobl.ubl gobl.cii

Executive summary

Belgium is transitioning to mandatory electronic invoicing for B2B transactions (B2G invoicing mandate is already in effect).

Key requirements:

• Format: Invoices must follow the European EN 16931 standard, with Peppol BIS in UBL format as the default and preferred format.
• Network: Peppol will be the default channel for transmitting electronic invoices.
• Technical capability: All taxpayers must have the technical capability to issue and receive e-invoices via Peppol, even when using alternative platforms.
• PDF invoices: Sending a PDF invoice by email or via a platform will no longer be enough to be compliant.

By 2028, Belgium plans to implement a comprehensive Peppol-based five-corner model that integrates e-invoicing with near real-time e-reporting, replacing the annual customer listing report. This system aims to reduce Belgium’s estimated €4.8 billion annual VAT gap.

Invopop provides Peppol integration solutions through its apps and integrations with platforms like Stripe, Chargebee, and Netsuite to ensure compliance.

Invoicing in Belgium

Belgium is evolving toward full digitalization of invoicing, with B2G Peppol enforcements already in place, with upcoming requirements for B2B in 2026 through 2028 when e-reporting becomes mandatory through a Peppol-based five-corner model.

Peppol Network (B2B, B2G)

Peppol is mandatory for companies from January 1st, 2026.

Belgium’s e-reporting and fiscalization regulation enforcement requires businesses to use the Peppol network to issue invoices.

Models	B2B, B2G
Format	Peppol BIS
Infrastructure	Peppol
Model	Peppol
Scope & Deadline	All B2B invoices from Jan 1, 2026; mandatory for suppliers to public authorities.
Agency	Service Public Fédéral Finances
Invopop Support	Peppol

Peppol

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E-reporting

Belgium plans to adopt a Peppol-based five-corner model in 2028, integrating e-invoicing with near real-time e-reporting. This new system will replace the annual customer listing report and is designed to reduce the country’s VAT gap, currently estimated at around €4.8 billion per year. Businesses will be able to comply using either certified e-invoicing service providers or adapted ERP, invoicing, or accounting software, though participation through service providers will not be mandatory.

Regulation

Legally required invoice content

Belgium is adopting the Peppol BIS 3.0 standard which is fully compliant with the EU EN 16931 Standard.

Peppol BIS 3.0 documents that are created and sent must comply with all the rules that are defined for the CORE invoice or the CIUS specification that it is based on. A CUIS is a custom invoice specification that can’t break the CORE standard. In the case of Belgium, the CIUS is the Peppol BIS 3.0 standard which extends the CORE standard.

Invopop helps you generate compliant Peppol BIS 3.0 (UBL) invoices from a single open source format called GOBL, performing all the necessary validations and conversions to support compliant EN 16931 (CORE) + Peppol BIS 3.0 (CIUS) invoices and other document types.

Exceptions to the 2026 e-invoicing mandate

The obligation does not apply to:

• Foreign taxpayers not established in Belgium (even if VAT registered in Belgium)
• Belgian entities exclusively engaged in exempt transactions (Article 44 VAT Code) – e.g., financial, medical, educational, social, sport, cultural sectors.
• Bankrupt VAT-taxpayers (with still active VAT number)
• A Belgian entity required to file regular periodic VAT returns and provide a Belgian VAT number. Thus if the customer doesn’t, the obligation may not apply.
• A transaction must be subject to Belgian VAT (local taxable supply). The obligation does not apply for:
  • Transactions exempt under Article 44 VAT Code.
  • Transactions deemed to take place for VAT purposes in another Member State or outside the EU.

Peppol registration & proof of ownership

Peppol requires Invopop to collect proof of ownership for regulatory compliance. As outlined in Section 3.3 End user Identification of the Internal Regulations II document, key details such as VAT number, address, contact information, and company name must be provided and validated during registration.

The mandatory fields for Peppol registration are:

• Company name (fiscal name)
• VAT number (tax ID)
• Complete company address
• Contact information
• Peppol participant ID
• Proof of ownership document

Proof of ownership can be:

• An invoice with direct debit authorization
• Any official document that proves you represent the company
• Business registration certificate

FAQ

Compliance questions

Belgium

Is B2B e-invoicing in Belgium mandatory?

Since 1 January 2026 B2B transactions are mandatory where both parties are Belgian VAT-registered. B2G has been mandatory since 2024. B2C and cross-border B2B are out of scope for the current mandate.

Who can issue invoices in Belgium?

Any entity with a Belgian KBO/BCE enterprise number (and a VAT number where applicable). Most Belgian companies are pre-registered in Peppol via BOSA, so onboarding is a migration rather than a fresh registration.

What are the legal obligations for receiving invoices in Belgium?

From 1 January 2026, Belgian VAT-registered recipients must be reachable via Peppol. Received invoices must be archived in their original structured format for 7 years.

Peppol

Is sending invoices via Peppol mandatory?

Mandatory dates vary by country. Belgium requires structured B2B e-invoicing — Peppol BIS by default — from January 2026. Germany phases B2B e-invoicing in between 2025–2028. France’s Factur-X via Peppol applies once the PA reform takes effect. Outside mandates, Peppol delivery is voluntary but increasingly expected for B2G and cross-border trade.

Does a Peppol invoice need to be EN16931 compliant?

Yes. Every document exchanged on Peppol BIS uses a UBL or CII syntax that conforms to the EN16931 European e-invoicing standard, plus the relevant Peppol BIS specification. Invopop generates compliant XML automatically when you use the Peppol app.

Why does Peppol require proof of ownership?

Peppol is a federated network — anyone could otherwise register a Participant ID for a company they don’t represent. Proof of ownership ties the Participant ID to a verifiable contact at the company, which is what allows the registration to be published on the SML.

What documents count as proof of ownership?

Requirements vary by Authority. In Belgium, for example, the supplier must provide a recent extract from the Banque-Carrefour des Entreprises (KBO/BCE) plus a signed mandate. Invopop walks the registering party through the local requirements during the registration wizard.

Are received Peppol invoices considered legally valid?

Yes — a Peppol BIS document delivered through a certified Access Point is treated as the legal e-invoice in any country that recognises Peppol. The signed UBL or CII XML is the authoritative record; archive it alongside any human-readable rendering you generate.

How long must I retain received Peppol invoices?

Retention is set by each country’s tax authority — typically 7 to 10 years in the EU. Invopop preserves the original XML and any generated PDF in the silo entry so you can satisfy local archival requirements wherever you operate.

More available in our Belgium FAQ section

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