In 2026, mandatory B2B e-invoicing is no longer a future prospect in Europe. It is the present reality. Multiple EU member states now require businesses to issue and receive structured electronic invoices for domestic transactions, and several more will follow within the next 12 to 18 months. The shift is driven by governments seeking to close the VAT gap, reduce fraud, and gain real-time visibility into economic activity. For CFOs, tax directors, and finance teams operating across borders, understanding each country’s mandate, timeline, and technical requirements is now a core compliance function.
This guide provides a country-by-country overview of e-invoicing mandates across Europe as of Q1 2026, explains the common standards underpinning these systems, and outlines what businesses should do to prepare for the next wave of requirements, including the EU’s VAT in the Digital Age (ViDA) initiative that will make cross-border e-invoicing mandatory by 2030.
Country-by-Country E-Invoicing Status
The following table summarises the current e-invoicing mandate status across European countries with active or confirmed requirements. Status reflects the situation as of March 2026.
| Country | Status | Key Date | Format / Standard |
|---|---|---|---|
| Italy | Mandatory (B2B, B2C, B2G) | January 2019 | FatturaPA via SDI (Sistema di Interscambio) |
| Romania | Mandatory (B2B, B2G) | January 2024 | RO e-Invoice (CIUS-RO based on EN 16931) |
| Germany | Receive mandatory, issue phased | Jan 2025 (receive) / Jan 2027 (issue) | EN 16931 (XRechnung, ZUGFeRD) |
| Belgium | Mandatory (B2B) | January 2026 | Peppol BIS Billing 3.0 |
| Croatia | Mandatory (B2G, B2B phased) | January 2026 | EN 16931 via national platform |
| Latvia | B2G mandatory, B2B planned | Jan 2026 (B2G) / 2028 (B2B) | Peppol BIS Billing 3.0 |
| Poland | Mandatory (B2B, phased rollout) | February 2026 | KSeF (Krajowy System e-Faktur) |
| Greece | Mandatory (B2B, B2G) | March 2026 | Peppol BIS via myDATA platform |
| France | Mandatory receive (Sep 2026), issue phased | September 2026 | Factur-X / UBL / CII via PPF and certified PAs |
| Spain | SII live, B2B e-invoicing upcoming | January 2027 | SII + VeriFactu (Facturae format) |
| Denmark | B2G mandatory, B2B voluntary | B2G since 2005 | NemHandel / Peppol BIS Billing 3.0 |
Key takeaway: By mid-2026, the majority of EU member states with large economies will have mandatory e-invoicing requirements in place for at least some transaction types. Businesses trading across borders should treat multi-country e-invoicing compliance as an active project, not a future concern.
The Common Standard: EN 16931
At the heart of European e-invoicing is EN 16931, the European standard for the semantic data model of an electronic invoice. Published by CEN (the European Committee for Standardisation), EN 16931 defines what information an e-invoice must contain: seller and buyer identification, line items, tax breakdowns, payment terms, and totals. It does not prescribe a single file format. Instead, it is implemented through two official syntaxes:
- •UBL (Universal Business Language) 2.1 - an OASIS standard widely used in Peppol-based countries and public procurement.
- •UN/CEFACT CII (Cross Industry Invoice) - a UN standard used particularly in Franco-German contexts, including Factur-X and ZUGFeRD.
EN 16931 was originally mandated for B2G (business-to-government) invoicing under EU Directive 2014/55/EU. It is now being extended to B2B contexts in Germany, France, and other countries as they roll out their domestic mandates. Countries build on EN 16931 by adding national rules called CIUS (Core Invoice Usage Specifications), which tailor the standard to local requirements while maintaining cross-border interoperability. The European Commission maintains documentation on EN 16931 at its eInvoicing Digital Building Blocks portal.
Peppol: The Delivery Network
While EN 16931 defines what an e-invoice contains, Peppol (Pan-European Public Procurement OnLine) defines how it is delivered. Peppol is a set of protocols and infrastructure for exchanging electronic documents between businesses through a network of certified Access Points. Each participant registers with an Access Point provider, and invoices are routed through the network using standardised identifiers. Think of it as a secure postal network for structured business documents.
Peppol is now the default transport layer for e-invoicing in Belgium, Greece, Latvia, Denmark, and several other countries. France and Poland have opted for centralised government platforms (PPF and KSeF respectively), though both maintain interoperability pathways with the Peppol network. The EU’s ViDA initiative is expected to further cement Peppol’s role as the backbone for cross-border e-invoicing across the single market.
Key Formats Across Europe
While EN 16931 provides the semantic baseline, several countries have developed national profiles or distinct formats to meet local requirements. The most important ones to know:
- •XRechnung - Germany’s national CIUS of EN 16931. Mandatory for B2G invoicing since 2020, and the reference format for the upcoming B2B mandate. Available in both UBL and CII syntax.
- •ZUGFeRD / Factur-X - a hybrid format jointly developed by Germany and France that embeds a structured XML invoice (CII syntax) inside a PDF/A-3 document. This allows both human-readable and machine-readable content in a single file. Widely supported in the DACH region and France.
- •FatturaPA - Italy’s proprietary XML format, predating EN 16931. All invoices must pass through the SDI (Sistema di Interscambio) clearance platform. Italy’s system is the longest-running mandatory B2B e-invoicing regime in Europe.
- •Peppol BIS Billing 3.0 - the standard Peppol invoice format, a CIUS of EN 16931 in UBL syntax. Used directly in Belgium, Greece, Denmark, Latvia, and many other Peppol-connected countries.
Practical note: Businesses operating in multiple countries will likely need to support at least two or three of these formats. ERP systems and e-invoicing service providers increasingly offer multi-format support, but it is important to verify coverage for each country where you have obligations. A standard PDF invoice does not qualify as an e-invoice under any of these mandates.
How E-Invoicing Relates to SAF-T
E-invoicing and SAF-T (Standard Audit File for Tax) are distinct but increasingly convergent compliance requirements. SAF-T is an OECD-developed XML schema for extracting and submitting accounting data to tax authorities, typically on demand or at periodic intervals. E-invoicing, by contrast, requires real-time or near-real-time exchange of structured invoice documents between trading partners, often routed through a government platform or certified network.
The convergence is practical: the data fields in an e-invoice overlap significantly with those in a SAF-T file. Countries like Poland (KSeF + JPK), Romania (e-Factura + D406), and Portugal (e-fatura + SAF-T PT) already operate both systems in parallel. As e-invoicing coverage expands, the transactional data that SAF-T was designed to capture becomes available to tax authorities in real time, reducing the need for separate periodic filings.
For businesses, this means that investments in e-invoicing compliance, particularly in data quality, master data management, and structured output from ERP systems, directly support SAF-T readiness and vice versa. The two are converging under the EU’s ViDA framework, and businesses that build their compliance infrastructure with both in mind will avoid duplicated effort.
EU ViDA: Driving Pan-European Convergence
The VAT in the Digital Age (ViDA) initiative is the EU’s plan to modernise VAT administration across all 27 member states. Agreed by the Council in 2024, ViDA has three pillars: Digital Reporting Requirements (DRR), the platform economy, and Single VAT Registration. The DRR pillar is the one most relevant to e-invoicing.
Under ViDA, the following key milestones will reshape European e-invoicing:
- •July 2030: Mandatory e-invoicing and digital reporting for cross-border B2B transactions within the EU. All intra-community supplies and acquisitions must be reported electronically using EN 16931-compliant invoices.
- •January 2035: Full alignment deadline for member states with pre-existing domestic e-invoicing and digital reporting systems. Countries like Italy, Poland, and France must bring their national systems into alignment with the harmonised ViDA framework by this date.
ViDA also removes the need for member states to request individual derogations from the EU VAT Directive when introducing domestic e-invoicing mandates. This change has already accelerated the pace of national mandates, as countries no longer face a lengthy approval process to require B2B e-invoicing.
What ViDA means for your business: Even if your country has not yet mandated B2B e-invoicing, the 2030 cross-border requirement means every business engaged in intra-EU trade will need e-invoicing capabilities within the next four years. Planning should start now.
Action Items for Businesses
Based on the current situation, here are the priority actions for finance and tax teams in 2026:
- •Map your obligations. Identify every country where you issue or receive invoices and check whether an e-invoicing mandate applies. The table above is a starting point, but local counsel should verify specifics.
- •Assess ERP readiness. Confirm that your accounting and ERP systems can generate invoices in the required formats (XRechnung, Factur-X, Peppol BIS, FatturaPA) and connect to the relevant delivery networks or platforms.
- •Select service providers. For Peppol-based countries, register with a certified Access Point provider. For clearance-model countries (Italy, France, Poland), ensure your provider is certified for the relevant government platform.
- •Invest in data quality. E-invoicing mandates expose data issues that paper and PDF workflows may have masked. Clean your master data: VAT numbers, addresses, product codes, and chart of accounts.
- •Test before go-live. Every country with a mandate offers or requires a testing phase. Use it. Exchange test invoices with your key trading partners well before the compliance deadline.
- •Plan for ViDA 2030. Even if your domestic obligations are met, the cross-border e-invoicing requirement under ViDA will affect any business with intra-EU trade. Build this into your medium-term compliance roadmap.
- •Validate your SAF-T files. If you operate in a country with SAF-T obligations, use the FAIA Validator to ensure your files are schema-compliant and free of business rule violations before submission.