Mandatory electronic invoicing in Belgium: the 2026 SME guide

If you invoice other Belgian businesses, an obligation took effect on 1 January 2026: your invoices must be electronic and structured, not just PDFs.² This guide explains the essentials and, above all, what to do in practice.

Many business owners still confuse an “electronic invoice” with a “PDF by email”. They are not the same thing, and that confusion can be costly. Let’s clarify things step by step, distinguishing official requirements from operational common sense.

A structured invoice is not a PDF

A PDF is a document designed to be read by a person. A structured electronic invoice is designed to be read and processed automatically by software, without re-entry. It is issued, transmitted and received in a standardised format that integrates directly into accounting.²

In practice, the invoice must comply with European standard EN 16931 and, by default, travel through the Peppol network.² Peppol is an international network connecting businesses and public authorities to exchange these documents securely and in a standardised way. An alternative format remains possible, but only if both parties agree, and the Peppol route must always remain available: neither party can impose the alternative on the other.²

Are you affected? (And who is not)

The obligation covers all Belgian businesses subject to VAT in transactions with one another: companies, self-employed people and liberal professions.¹ Two cases often come as a surprise:

• The VAT exemption scheme for small businesses (annual turnover not exceeding €25,000) is covered.¹
• The special agricultural scheme is also covered, at least for receiving B2B invoices.¹

However, some cases are exempt from the obligation to issue or receive a structured invoice:¹

• taxable persons in bankruptcy;
• businesses carrying out only transactions exempt under Article 44 of the VAT Code (certain medical care, socio-cultural services, financial services, education, etc.);
• taxable persons not established in Belgium and without a permanent establishment;
• taxable persons under the flat-rate scheme (Article 56 of the VAT Code), exempt until 1 January 2028.¹

Finally, an essential point: sales to private individuals (B2C) are not covered.² If you work only with private individuals, you are not subject to the issuing obligation.

The timeline: 2026 and tolerance during the first three months

The effective date is clear: 1 January 2026.² There is an important nuance for the initial phase, however: the administration applies a tolerance period during the first three months (January to March 2026), during which no penalty is imposed for a failure directly linked to the new obligation.⁴

Be careful not to interpret this as a postponement. This tolerance is conditional: it requires evidence of reasonable, timely preparation. It is not a general postponement of the obligation, and a business showing no preparation can still be penalised during this window.⁴

Penalties

The Royal Decree of 8 July 2025 sets fixed fines for non-compliance:³

Beyond the fine, the real risk is operational: a client who has switched to structured invoicing could simply refuse your PDFs, while your own suppliers may expect you to receive compliant invoices. Non-compliance is not just a tax risk on paper; it directly obstructs your payments.

The good news: a 120% tax deduction

To ease the transition, a support measure exists for tax periods from 2024 to 2027: small SMEs and self-employed people using subscription plans can apply an enhanced expense deduction of 120% for invoicing software.³ The enhancement covers the additional cost of preparing, sending and receiving structured electronic invoices.³

This is an expense deduction, not a 120% refund. The tax saving depends on your tax position and eligible expenses. For an existing subscription, the extra cost of electronic invoicing must be shown separately on the invoice. Check the conditions with your accountant and on the federal electronic invoicing portal.

Your four-step action plan

The theory is established. Here is the practical approach we use with the self-employed people and SMEs we support.

1. Check your situation

An active VAT number and business clients? You are very likely affected. If you fall under an exemption (Article 44, flat-rate scheme, bankruptcy), confirm it with your accountant rather than assuming.

2. Choose your Peppol channel

You need an entry point to the Peppol network. For many SMEs, that means accounting or invoicing software that is already compatible; for others, a dedicated access point. What matters is being able to both issue and receive structured invoices, not just one of the two.

3. Test before the real deadline

Do not discover a transmission problem on the day an important invoice is sent. Issue and receive a few test invoices with a trusted client or supplier. The tolerance period⁴ serves precisely this purpose: showing serious preparation.

4. Apply the 120% deduction

If you use a subscription, tell your accountant about the additional cost of structured invoicing so you can benefit from the enhanced deduction³ in the correct tax period.

Another obligation within a broader shift

Structured invoicing is not arriving alone. It is part of a wave of digital compliance affecting Belgian businesses, alongside web accessibility becoming mandatory and requirements around personal data and the GDPR. Taken individually, these obligations may seem burdensome. Viewed together, they point in one direction: more automated, more traceable and, along the way, more efficient processes.

It is also an opportunity. A business that digitises its invoicing properly saves time, reduces re-entry errors and gets paid faster. The regulatory constraint can become a source of efficiency, provided it is managed rather than endured.

Verified sources

Every numerical or regulatory fact in this article is traced to a source accessed in June 2026. Click to verify it.

1. [1] FPS Finance, e-invoice portal · who is covered by the obligation (VAT-taxable businesses, self-employed people, exemption scheme below €25,000, agricultural scheme) and who is exempt (Article 44, Article 56 flat-rate scheme until 2028, bankrupt persons, non-established persons). Verified June 2026. efacture.belgium.be
2. [2] einvoice.belgium.be (official portal) · effective from 1 January 2026, structured format compliant with EN 16931 transmitted by default via Peppol, PDF by email insufficient, no B2C obligation. Verified June 2026. einvoice.belgium.be
3. [3] UCM · penalties set by the Royal Decree of 8 July 2025 (€1,500, €3,000, €5,000) and the enhanced 120% expense deduction for invoicing software used on subscription by SMEs and self-employed people (tax periods 2024 to 2027). Verified June 2026. ucm.be
4. [4] BDO Belgium · conditional three-month tolerance period (January to March 2026), without a general postponement of the obligation. Verified June 2026. bdo.be

This article is for information and does not replace personalised tax advice. For your specific situation (VAT scheme, exemptions, deduction period), contact your accountant or the official e-invoice portal.