What Do New Belgian E-Invoicing Mandates Mean for Your Corporate Travel Program?

Belgium didn't ease into e-invoicing. While France planned a phased rollout over two years and Germany spread its transition across three, Belgium mandated that every domestic B2B invoice between VAT-registered entities must be a structured electronic document transmitted over the Peppol network, effective January 1, 2026.[1] For finance teams managing European travel spend, the question isn't whether this affects your program. It's whether your invoicing infrastructure is ready for the structured data that every Belgian hotel stay, rail booking, and ground transport charge now generates.

What does Belgium's e-invoicing mandate require?

Belgium's B2B e-invoicing mandate took effect on January 1, 2026, requiring all VAT-registered businesses to issue and receive structured electronic invoices for domestic transactions.[1] The country chose what many call a "Big Bang" approach: no phased rollout by company size or sector, no extended grace period beyond the initial three months that ended March 31, 2026.[2]

The mandate's core requirements are straightforward:

• Format: Invoices must comply with the European Standard EN 16931, using Peppol BIS Billing 3.0 in UBL 2.1 or CII 16B format[3]
• Transmission: The Peppol network is the default delivery channel, though parties can agree to use other EN 16931-compliant formats[1]
• Scope: All domestic B2B transactions between Belgian VAT-registered entities. International suppliers without Belgian establishment are exempt[1]
• Penalties: Non-compliance carries graduated fines: €1,500 for a first offense, €3,000 for a second, and €5,000 for a third within three months, per non-compliant invoice[3]

Belgium uses a post-audit model, meaning invoices flow directly from seller to buyer without government pre-approval. This differs from clearance systems in Italy, Poland, and Romania, where invoices must transit a government platform before they're legally valid. Read our comprehensive guide to understand what qualifies as an e-invoice.

What does post-audit mean in practice?

Under Belgium's post-audit approach, the tax authority reviews records after the fact rather than validating each invoice in real time. The Belgian government has signaled a transition to a 5-corner model by January 2028, which will add near real-time reporting obligations alongside the existing 4-corner Peppol structure.[3]

PDF invoices, emailed folios, and paper documents are no longer compliant for in-scope B2B transactions. A PDF invoice sent by email is not an e-invoice under Belgian law, regardless of how "electronic" it appears.[4]

What is Peppol and how does Belgium use it for e-invoicing?

Peppol (Pan-European Public Procurement Online) is a four-corner network of accredited service providers that route structured invoices between trading partners.[5] Belgium adopted Peppol as the mandatory default for B2B e-invoicing, building on an existing B2G (business-to-government) mandate that has required Peppol for public procurement since March 2024.[1]

The network works through certified access points. A supplier connects to the Peppol network through their access point, and the invoice routes automatically to the buyer's access point based on the recipient's Peppol identifier. Navan uses Eezi as its access point to send e-invoices when authorized by suppliers.

The identifier problem

One of the most common operational issues in Belgium's early months has been identifier confusion. Businesses registered under the legacy 9925 VAT-based identifier may not receive invoices sent to the newer 0208 enterprise number (CBE), and vice versa.[6] This technical detail causes real problems: invoices that appear sent but never arrive, or duplicates when a business is registered under both identifiers without realizing it.

For companies receiving hotel invoices from Belgian suppliers, verifying the correct Peppol identifier is a prerequisite for receiving compliant documents.

Where does corporate travel collide with Belgium's e-invoicing rules?

Belgium's mandate was designed for procurement: two parties that know each other, with a pre-existing commercial relationship and a predictable transaction. Corporate travel breaks every one of those assumptions.

When an employee books a hotel in Brussels through a travel management company (TMC), three parties are involved: the traveler checking in at the front desk, the TMC that arranged the booking, and the company that pays the bill. The hotel sees the traveler's name at check-in. The company's VAT number and Peppol identifier need to appear on the invoice. If the hotel doesn't receive those details before checkout, the invoice routes to the wrong entity or defaults to a B2C receipt with no VAT reclaim rights.

Three complications specific to travel

• The traveler isn't the buyer. The person at the hotel is not the legal purchaser. The company is. If the hotel's invoicing system doesn't capture the company's enterprise number, the e-invoice can't be correctly addressed.

• Prices aren't known at booking. Hotel charges often change between reservation and checkout (room upgrades, minibar charges, late checkout fees). The final invoice can only be issued after the stay, creating a timing gap between the booking and the compliant document.

• One trip produces multiple documents. A single business trip to Belgium can generate a flight ticket, a hotel folio, a rail receipt, and ground transport charges, each potentially from a different supplier with different Peppol capabilities.

The SETO/EDV/KPMG Lawyers White Paper on electronic invoicing in travel, published in February 2026, describes this challenge: the travel sector's "complexity of intermediation, third-party payment collection, cancellation volume, corporate and TMC issues make this reform more demanding than in most other industries."[7]

How does your TMC's commercial model affect Belgian VAT reclaim?

The format of your invoice matters less than who issued it. Under Belgium's Peppol mandate, only the legal seller can issue a compliant e-invoice. The TMC's commercial model determines who that legal seller is, and whether your company can reclaim Belgian VAT. See how TMC commercial models affect VAT reclaim.

Agent pass-through: VAT reclaim intact

Under a disclosed agent model, the TMC arranges the booking on the company's behalf without becoming the legal seller. The supplier invoices the company directly, the company's Belgian enterprise number appears on the e-invoice, and VAT reclaim rights are structurally preserved. Navan operates as a disclosed agent on every booking, so supplier invoices retain full VAT-reclaim eligibility.

Merchant of record: VAT reclaim locked

Under a merchant-of-record arrangement, the TMC buys inventory from suppliers and resells it to the client. EU law applies the Tour Operators' Margin Scheme (TOMS), which means only the TMC's margin is subject to VAT. The client receives a Peppol-compliant invoice from the TMC, but VAT on the underlying supplier charges is locked inside the margin scheme and can't be reclaimed.

Choosing the right TMC model can make the difference between recovering that VAT and writing it off.

What happens when a Belgian supplier can't issue a proper e-invoice?

Not every hotel, car rental company, or ground transport provider in Belgium is operationally ready to issue a compliant Peppol invoice. Registration on the network has been widespread, but operational readiness remains uneven.[9] Some suppliers are registered but still process invoices manually. Others send structured XML without attaching a human-readable PDF, leaving finance teams with machine data their accountants can't visually verify.[6] See what a Receipt with XML is and what it preserves.

Navan's document hierarchy for Belgian bookings

Navan addresses this gap through a structured document cascade:

• E-invoice (Tier 1): When a supplier has authorized Navan to issue e-invoices on their behalf (e.g., Lufthansa Group, Deutsche Bahn), Navan issues a compliant Peppol BIS 3.0 invoice through its access point. Full VAT reclaim and CIT deduction.

• Supplier invoice collected (Tier 2): The supplier issues the e-invoice directly. Navan passes the company's Belgian enterprise number and routing credentials to the supplier at booking time. Full VAT reclaim and CIT deduction.

• Receipt with XML (Tier 3): When no tax invoice can be collected, Navan issues a Receipt with XML in Peppol BIS Billing 3.0 / UBL format. This structured document preserves the corporate income tax (CIT) deduction and audit trail. It doesn't support VAT reclaim, but it fills the gap honestly rather than leaving bookings undocumented.

• Estimated charges (Tier 4): A temporary placeholder when final costs aren't known, replaced by a higher-tier document when available.

Every booking produces a document. No gap goes undocumented in Navan's system.

How to prepare your travel program for Belgian e-invoicing compliance

Finance teams managing corporate travel programs with Belgian spend should verify five areas before the next audit cycle:

• Confirm your Peppol registration uses the 0208 enterprise number. The legacy 9925 VAT-based identifier causes delivery failures. Verify your registration in the Peppol Directory and confirm your access point has activated the 0208 identifier.[6]

• Verify your TMC's commercial model. Ask a direct question: "Are you a disclosed agent or a merchant of record for my Belgian bookings?" The answer determines whether your VAT reclaim rights survive the new mandate.

• Set up your ERP to receive UBL XML. Peppol invoices arrive as structured data, not visual documents. Your accounting system needs to parse UBL XML and match it against booking records. If your ERP can't process structured e-invoices, you'll be processing them manually.

• Audit your hotel booking flow. Belgian hotels need your company's enterprise number and Peppol identifier at booking time, not at checkout. Confirm that your TMC passes these details to suppliers with every Belgian reservation.

• Review penalties and plan for exceptions. Receivers can be fined too, not just senders.[10] A business that can't receive structured invoices isn't compliant, even if it's sending correctly. Budget for the compliance investment: the Belgian government offers a 120% tax deduction for SME invoicing software purchased between 2024 and 2027.[4]

Navan handles Belgian e-invoicing compliance at the document layer, passing enterprise numbers to suppliers at booking time and issuing compliant documents through its Peppol access point. Travelers book exactly as before: same flow, same tools, no change to the booking experience.

For a broader view of how e-invoicing mandates affect corporate travel across the EU, see our complete guide to e-invoicing.