Poland will require taxpayers to notify the e‑Tax Office before issuing invoices with attachments in KSeF 2.0 from 1 January 2026. The notification must include taxpayer details, activity type and technical parameters, and attachments must be part of the XML file. Additional legislative updates include simplified invoice rules, JPK_VAT amendments, and exemption provisions effective February 2026.

Mexico’s tax authority, SAT, has issued Rule 2.9.21 under RMF 2026, mandating digital platforms to provide real‑time, permanent online access to transaction records. The rule requires next‑day data availability, a five‑year searchable archive, and a formal request by April 30 2026, with detailed data obligations for both service providers and intermediary platforms.

Spain has postponed the implementation of the Verifactu Ordinance to 2027, extending the original July 2025 deadline. An extraordinary opt‑out window for voluntary SII participants runs from 26 December 2025 to 31 January 2026, allowing withdrawal via Form 036/037 effective 1 January 2026. The decree also clarifies that mandatory SII participants cannot opt out and that non‑compliant invoicing software cannot be sold after 29 July 2025.

Denmark’s Digital Bookkeeping Act entered its final rollout phase on 1 January 2026, extending mandatory certified digital bookkeeping to about 118,000 small and foreign entities with turnover above DKK 300,000. The country also cancelled the OIOUBL 3.0 e‑invoice format on 14 January 2026, with new specifications to be clarified on 24 February 2026.

The UAE Peppol Testbed has been upgraded to support service providers preparing for accreditation. Two new inbound test cases – invalid PINT AE invoices due to Schematron and syntax errors – have been added, along with an updated UAE Tax Data Document (TDD) version 1.0.1. Service providers must return a negative Message Level Response and submit a UAE Tax Data Status (TDS) to the Federal Tax Authority Access Point.