Irish Revenue has clarified that for Phase One of its VAT Modernisation programme, a "large corporate" is defined by management by the Large Corporates Division rather than turnover. From 1 November 2028, all VAT‑registered businesses in Ireland must be able to receive structured e‑invoices, and those within scope must issue EN16931‑compliant e‑invoices and transmit data to Revenue. The programme introduces mandatory electronic invoicing and real‑time reporting for domestic B2B transactions.

Delaying VAT compliance while upgrading to SAP S/4HANA exposes companies to rework, higher costs, and regulatory penalties. Early integration of VAT and e‑invoicing solutions can prevent errors, reduce audit risk, and accelerate time‑to‑value. The article warns that legacy SAP ERP systems will reach end‑of‑support in 2027, urging firms to embed compliance from day one.

Ireland's Revenue has confirmed that large corporates will be required to issue structured e‑invoices for domestic B2B transactions from 1 November 2028, as part of the phased rollout of the EU ViDa e‑invoicing and real‑time reporting initiative. The regime will expand to all cross‑border EU B2B transactions benefiting from 0% VAT in Phase Two (November 2029) and to all cross‑border B2B transactions under the EU directive from 1 July 2030.

The OECD’s 2026 report outlines guidance on Digital Continuous Transactional Reporting (DCTR), urging jurisdictions to adopt real‑time VAT transaction reporting and structured e‑invoicing. It highlights the EU’s ViDA initiative, slated for rollout by 2030, and the requirement for intra‑EU invoicing interoperability by 2035. Businesses are advised to modernise ERP and billing systems, improve data quality, and strengthen security to meet the forthcoming digital compliance landscape.