Peppol e-invoicing is a key pillar of European digital compliance, with the network based on EN 16931 and Peppol BIS enabling interoperability in Belgium, France, and Germany. New mandates in Belgium (2026) and France (Facture Electronique) will adopt Peppol, and Melasoft serves as a certified Peppol Access Point to automate compliance, integrating with SAP to ensure 100% legal compliance across 30+ countries.

Poland’s 2026 tax landscape focuses on digital compliance, with mandatory e‑invoicing via the National e‑Invoicing System (KSeF) and new corporate income tax reporting in JPK_CIT format. The year also sees expanded withholding tax exemptions for foreign investment funds and a temporary 30% corporate tax rate for banks.

KPMG’s latest e‑invoicing developments timeline highlights key implementations for 2026. Belgium will require all VAT payers to issue and receive electronic invoices for domestic B2B transactions from 1 January 2026, with a fallback rule for technical issues. Poland will implement the remaining four e‑invoicing acts in February 2026 after signing them on 9 December 2025.

Portugal has extended its mandatory B2G e‑invoicing regime to all business sizes, with key deadlines moving into 2026 and 2027. The new rules require QR codes, ATCUD codes, and eventually Qualified Electronic Signatures (QES) for electronic invoices, while the eSPAP platform remains the official submission channel. SAP ECC and S/4HANA users must adopt the eDocument Cockpit and integration flows to remain compliant.

Spain’s December 2025 draft law transposes the first wave of the EU ViDA directive, tightening OSS rules, clarifying the €10,000 distance‑sales threshold, and expanding non‑Union OSS scope. It also introduces a representative requirement for non‑EU businesses seeking VAT refunds and sets transitional measures for call‑off stock and energy supplies. The draft signals that the most significant e‑invoicing and digital‑reporting mandates will arrive in 2030 and 2035.

Belgium will require VAT‑liable businesses to issue and receive structured electronic invoices (PEPPOL) from 1 January 2026. For the first three months of 2026, no sanctions will be imposed if companies can prove timely and reasonable preparations, but the tolerance is case‑by‑case and not a blanket postponement.

Croatia’s new Fiscalization Act will require all VAT‑registered businesses to issue electronic invoices for domestic B2B transactions from 1 January 2026, using EN 16931‑1:2017 standards and real‑time transmission to the tax authority. Paper invoices will only be allowed in exceptional cases, and non‑VAT‑registered businesses must accept and issue e‑invoices by 1 January 2027. Penalties apply for non‑compliance.

On 15 January 2026 France and Germany will roll out updated hybrid e‑invoicing standards—Factur‑X 1.0.8 in France and ZUGFeRD 2.4 in Germany—aligned with the EU EN 16931 framework and the French AFNOR XP Z12‑012 standard. The update adds support for complex invoice structures, a newer UN/CEFACT CII release, clearer rounding tolerance rules, and updated documentation. Businesses invoicing in either country should verify ERP compatibility and adjust tax logic to meet the new tolerances.