Mandatory E-Invoicing in Belgium: What Changes and How to Get Ready

*By Timothy Jacqmin — Co-Founder, Nexuro Digital · July 2026*

TL;DR

• Since 1 January 2026, a structured electronic invoice is mandatory for all B2B transactions between VAT-registered companies established in Belgium. A PDF sent by email, or paper, no longer meets the legal requirement.
• The channel is Peppol (Peppol BIS 3.0 format, European standard EN 16931). An invoice must travel software to software, not inbox to inbox.
• Almost every business is concerned, including small ones under the VAT exemption threshold. A few cases are exempt (Article 44 exempt operations, non-residents without a permanent establishment, bankrupt entities).
• Progressive penalties since 1 April 2026 (€1,500, then €3,000, then €5,000), after a tolerance window in the first quarter. And a tax incentive exists: up to 120% cost deduction for small companies.
• Getting ready takes four steps: check your software, connect to Peppol, test sending and receiving, train your team. It is doable fast and painlessly.

A new rule is now in force, and it touches every Belgian SME owner, with almost no exception. The electronic invoice is no longer a "modern" option: it is a legal obligation. Many still believe that emailing a PDF is enough. It no longer is.

Good news: this project is simpler than it looks, and the government helps you fund it. Here is what actually changes, who is concerned, what you risk if you do nothing, and how to become compliant cleanly (with Peppol and, if you are equipped, Odoo).

Mandatory e-invoicing in Belgium: from when?

The B2B e-invoicing obligation came into force on 1 January 2026 in Belgium. From that date, every VAT-registered company established in Belgium must issue and receive structured electronic invoices for its transactions with other Belgian businesses.

Be careful not to mix things up: several deadlines coexist, and they cover different flows. Here is the official timeline to keep in front of you.

Keep in mind: the B2B obligation has been active since 1 January 2026. The first-quarter "tolerance" does not push back the obligation: it only concerns the enforcement of fines. Technically, you had to be ready on 1 January.

Who must comply (and who is exempt)?

The obligation covers all VAT-registered companies established in Belgium, whatever their size. A freelancer, a micro-business, an SME, a large group: everyone is in the same boat as soon as the invoice is addressed to another Belgian business (B2B).

A point many miss: even small companies under the VAT exemption scheme (turnover below €25,000) are concerned, as are farmers under the flat-rate regime. Not charging VAT does not exempt you from issuing an invoice in the right format.

There are, however, a few precise exemptions. You are not required to issue structured electronic invoices if you fall into one of these cases:

1. You carry out only VAT-exempt operations under Article 44 of the VAT Code (certain medical professions, socio-cultural activities, etc.).
2. You are a non-resident VAT taxable person without a permanent establishment in Belgium.
3. You are bankrupt.
4. You are under the flat-rate (forfait) regime (a temporary exemption, until 1 January 2028 at the latest).

Common mistake: thinking "I only do B2C, so this does not concern me." Wrong on one key point: you must at least be able to receive structured electronic invoices from your B2B suppliers. Receiving is not optional, even if you only invoice private individuals.

B2C (invoicing private individuals) stays outside the obligation: e-invoicing is allowed there with the customer's consent, but not imposed.

What is a "real" electronic invoice (and why a PDF no longer counts)?

Here is misunderstanding number one. A legal electronic invoice is not a PDF, nor a scan, nor an image: it is a structured, machine-readable file exchanged directly between the sender's and the recipient's software. In the eyes of the law, a PDF emailed as an attachment remains the equivalent of a paper invoice.

The difference is technical but fundamental. A PDF is made to be read by a human. A structured invoice (in UBL format, carried by Peppol BIS 3.0) is made to be read by a machine: every data point (amount, VAT, company number, due date) is tagged and processed automatically by the other side's accounting software, with no re-keying.

The official channel for this exchange is the Peppol network. Peppol (Pan-European Public Procurement On-Line) works as a secure, interoperable network: each company connects through an access point, then invoices flow from one system to another, much like an email travels between servers. The reference standard is the European standard EN 16931.

Keep in mind: you may use a network other than Peppol only if both parties agree AND the format complies with EN 16931. In practice, for an SME, Peppol is the default route: the simplest and most universal.

If you want to understand how the network works step by step, we explained it in our dedicated article: What is Peppol? Electronic invoicing explained simply.

What are the penalties for non-compliance?

Since 1 April 2026, a progressive penalty regime applies to non-compliant companies. The first quarter of 2026 acted as a tolerance window: the authority did not fine good-faith businesses able to demonstrate genuine, timely efforts to comply.

The scale of fines rises in steps, depending on repeat offenses:

An important timing detail: a new offense counts as a "second" one only if the authority establishes it more than three months after the first. That window gives you time to fix the situation before the amounts climb.

But the fine is not the only risk, and probably not the heaviest. If you cannot exchange structured invoices, your business customers may see their right to deduct VAT questioned, and they will choose compliant suppliers. The real cost of inaction is not the fine: it is the commercial risk of becoming impossible to deal with for your B2B partners.

Are there tax incentives to get equipped?

Yes, and that is one more reason to act calmly. The Belgian government introduced an increased 120% cost deduction on e-invoicing expenses for small companies. In concrete terms, for €100 spent, you deduct €120 from your taxable profit.

This measure covers implementation and usage costs: subscriptions to a compatible invoicing tool, consultancy fees, and recurring costs (your Peppol access point subscription, for example). It applies to tax years 2024 to 2027.

Two conditions to know:

1. The increased deduction targets small companies (not exceeding more than one of these thresholds in the last closed financial year: €11,250,000 turnover, €6,000,000 balance sheet total, 50 employees on average).
2. It concerns non-depreciable costs (typically subscription and consultancy costs, not hardware amortized over several years).

On top of this, an increased digital investment deduction has been available since 1 January 2025, which can cover hardware and software acquired to comply.

Recommendation: confirm the exact eligibility of your expenses with your accountant. The principle is clear, but the thresholds and cost categories deserve a case-by-case check. The point to remember: the net cost of your compliance is lower than the sticker price.

How do you get ready, concretely? (the checklist)

Becoming compliant takes four steps, and most SMEs can wrap it up in a few days. Here is the sequence, in order.

1. Take stock of your current software. Does your invoicing tool or ERP already handle sending and receiving through Peppol? Many recent tools (including Odoo) offer it natively or via a module. If yours does not, you need to add to it or switch.
2. Connect to Peppol through an access point. This is the connection that gives you an "address" on the network (based on your company number). Without it, you can neither send nor receive.
3. Test in real conditions. Issue a structured invoice to a customer already connected, and receive one. Check that the data lands cleanly in your accounting, without re-keying.
4. Train your team and adapt your processes. Who issues, who checks, how do you handle a rejection? The technology is not enough: the administrative flow has to keep up.

Common mistake: waiting until the last minute, thinking "I will do it when a customer asks." The problem is that setup, testing, and training take time. Better to be ready before you receive the first structured invoice you cannot process.

At Nexuro, we always tackle this kind of project as a system, not a patch: we start from your real flows (quote, order, invoice, payment) and plug compliance in where it makes sense, without breaking what already works.

Why Odoo (with Peppol) fits the need well

Odoo natively supports issuing and receiving invoices through Peppol, which turns compliance into a checkbox rather than a separate project. If you already manage your sales or accounting in Odoo, enabling Peppol happens within the same tool: no extra software to connect, no double entry.

The benefit goes beyond simple compliance. When e-invoicing is linked to your CRM and sales management, every invoice flows automatically from an approved quote and then an order. You gain on three fronts: fewer re-keying errors, clearer payment tracking, and clean data to steer your business. That is exactly the logic we stand for: connecting your CRM to sales to actually steer them, instead of stacking tools that do not talk to each other.

To be fair: Odoo is not the only compliant solution. Many Belgian accounting tools also offer a Peppol connection. The right choice depends on your existing setup. If you want to dig into what Odoo enables on invoicing and automation, two articles complete this one: Peppol and Odoo: automating your electronic invoicing and Odoo features that are often underused.

What comes after 2026?

The 2026 electronic invoice is only the first step of a broader shift. Two further deadlines are already known, and it is better to anticipate them than to discover them.

First, e-reporting on 1 January 2028: beyond exchanging invoices, companies will have to transmit certain transaction data to the authority in near real time (the Peppol five-corner model). The government's goal is clear: fight VAT fraud and simplify reporting.

Then the European reform ViDA (VAT in the Digital Age) will make cross-border e-invoicing and e-reporting mandatory for intra-EU B2B transactions on 1 July 2030. In other words, what Belgium is setting up today foreshadows a European standard.

The good news: by connecting to Peppol now, you are already aligned with these next steps. You are not making a throwaway investment for 2026; you are laying durable infrastructure.

FAQ

What is mandatory e-invoicing in Belgium?

It is the obligation, in force since 1 January 2026, to issue and receive structured (machine-readable) invoices for every transaction between Belgian VAT-registered businesses. These invoices are exchanged through the Peppol network, in Peppol BIS 3.0 format (EN 16931 standard). A PDF sent by email no longer meets this legal obligation.

Who must comply with mandatory e-invoicing?

All VAT-registered companies established in Belgium, whatever their size, including small ones under the VAT exemption scheme. A few exemptions exist: businesses carrying out only exempt operations (Article 44), non-residents without a permanent establishment, bankrupt entities, and the flat-rate regime (temporarily, until 2028). Even in B2C, you must be able to receive structured invoices.

Is a PDF sent by email a valid electronic invoice?

No. Since 1 January 2026, a PDF or scan sent by email is no longer a compliant electronic invoice in B2B. The law requires a structured invoice, exchanged software to software through an interoperable network such as Peppol. The PDF stays readable by a human, but it is not automatically processable by a machine, which is precisely the requirement.

What are the penalties for non-compliance?

Since 1 April 2026, a progressive fine regime applies: €1,500 for the first offense, €3,000 for the second, then €5,000 for subsequent ones. An offense counts as a "second" only if established more than three months after the first. Beyond the fine, inaction risks cutting you off from B2B customers who require compliant suppliers.

How much does compliance cost, and are there incentives?

The cost varies with your current software but stays moderate for an SME (often a Peppol access point subscription, sometimes a software module). Above all, a tax incentive exists: small companies benefit from an increased 120% deduction on e-invoicing costs (software, subscription, consultancy) for tax years 2024 to 2027. The net cost is therefore lower than the sticker price.

How do you connect to Peppol as an SME?

You connect through a Peppol "access point," often included in your invoicing tool or ERP. If you use Odoo, the feature is native: just enable it. Otherwise, many Belgian accounting tools offer a connection. The steps: check your tool, enable or subscribe to the connection, test a send and a receive, then train your team. Count on a few days, not months.

Conclusion

Mandatory e-invoicing is not just one more administrative constraint: it is a change of standard, like the move to computerized accounting in its day. The rule is active, so are the penalties, and the tax incentive will not last forever. The right move is not to wait, but to become compliant cleanly, once, by connecting your invoicing to Peppol and, ideally, to your sales management.

Not sure whether your software is ready, or where to start? We can look at it together, simply, during a free audit of your digital ecosystem and your invoicing flows. No bots, no salespeople: Timothy or Bryan replies to you personally within 24h, with no pressure.

*— Timothy Jacqmin, Co-Founder, Nexuro Digital*

Sources

• FPS Finance — Who will be required to use electronic invoicing?
• FPS Finance — E-invoice (official B2B portal)
• European Commission — eInvoicing in Belgium
• Loyens & Loeff — E-invoicing in Belgium as from 1 January 2026 (Royal Decree, grace period & penalties)
• Banqup — Tax incentive for electronic invoicing in Belgium (120% deduction)