Belgium Went First. Your E-Invoicing Deadline Is Closer Than You Think

On 1 January 2026, Belgium switched on mandatory electronic invoicing for domestic B2B transactions. No turnover threshold. No exemption for small companies. If you are VAT-registered and established in Belgium, you issue and receive structured e-invoices, and you do it in Peppol BIS 3.0 format. That is not a proposal or a consultation. It has been live for six months.

Belgium is not an outlier. It is the leading edge of a decade-long restructuring of how VAT works across Europe, and the deadlines that feel comfortably distant are closer than most finance teams have priced in.

What ViDA actually is

VAT in the Digital Age — ViDA — was formally adopted in March 2025 and rolls out in stages through to 2035. It rests on three pillars: mandatory e-invoicing with digital reporting, new VAT obligations for platform operators, and a single VAT registration to replace the current patchwork. The European Commission's own case for it is that e-invoicing could cut VAT fraud by up to €11 billion a year and reduce compliance costs for traders by more than €4 billion annually over a decade.

The timeline that matters

Working through the phases as they currently stand:

• January 2027 — the One Stop Shop extends to cover B2C supplies in the e-charging sector, alongside clarifications for OSS and IOSS users.
• July 2028 — deemed supplier rules bite for short-term accommodation and road passenger transport platforms. The main Single VAT Registration reforms begin, including mandatory reverse charge for non-established suppliers.
• July 2030 — the big one. Cross-border B2B transactions fall under Digital Reporting Requirements, built on mandatory e-invoicing to the EN 16931 standard.
• January 2035 — member states running their own domestic real-time reporting must align with the EU model.

Individual member states are moving ahead of the EU-level clock on their own domestic mandates. Germany requires all established businesses to issue compliant domestic B2B e-invoices from January 2028. Ireland set out a three-phase roadmap in Budget 2026, beginning with large VAT-registered companies in November 2028 — the country's most significant VAT reform in over fifty years.

Fragmentation is the real cost

The stated goal of ViDA was harmonisation. The reality, for now, is the opposite. Germany, Belgium, Poland, France and Spain all have mandates in flight with different formats, different transmission protocols and different start dates. A business trading across several member states is not implementing one change. It is implementing several, in sequence, each with its own technical specification.

The standards themselves are still moving. CEN published the updated EN 16931-1:2026 semantic standard in March 2026, adding fields to support digital reporting and superseding earlier versions. Member states also gained flexibility to use alternative standards for purely domestic transactions — which accommodates existing national systems, and simultaneously guarantees the fragmentation continues.

What to do in the next twelve months

• Map your exposure. Which member states do you actually trade with, in which direction, B2B or B2C? The answer determines which mandates apply and when.
• Audit your invoice data, not just your invoice format. Most implementations fail because the required fields were never captured, not because the format was wrong.
• Check whether your accounting stack has a credible roadmap. If your provider cannot tell you their Peppol and EN 16931 position, that is information.
• Stop treating PDFs as e-invoices. A PDF emailed as an attachment is a digital picture of an invoice. It is not structured data and it will not satisfy these regimes.
• Budget for it as a project. Businesses that treated Making Tax Digital in the UK as a last-minute compliance scramble generally paid more than those who planned it.