- Launch of KSeF 2.0: The Polish Ministry of Finance has officially launched KSeF 2.0, marking the beginning of mandatory e-invoicing in Poland as the new platform for digital tax documentation, following a technical maintenance period at the end of January 2026.
- Technical Transition and Shutdown of KSeF 1.0: A scheduled maintenance break from January 26 to January 31, 2026, facilitated the transition from the legacy KSeF 1.0 system, during which the system was largely inaccessible, but a verification window allowed businesses to perform final checks on user authentication and other protocols.
- Mandatory Use for Large Enterprises: As of February 1, 2026, KSeF 1.0 has been permanently discontinued, and all taxpayers must now issue credentials using the KSeF 2.0 Taxpayer Application, with mandatory use beginning for large enterprises.
Source Comarch
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