- On January 28, 2026, at 8:00 AM, the KSeF 2.0 API will be made available in the production environment for commercial system verification.
- A technical break for the KSeF production environment is scheduled from January 26 to 31, 2026, to complete the implementation of KSeF 2.0.
- During the break, some services (KSeF 1.0, related integrations, and certificate modules) will be unavailable; certificate downloads resume February 1, 2026, only via KSeF 2.0.
- From February 1, 2026, KSeF 2.0 becomes the sole version in use, and KSeF 1.0 and its modules will be discontinued.
Source: gov.pl
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.
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