- KSeF 1.0, including the Certificate and Authorization Module (MCU), will be unavailable due to planned technical work from January 26-31, 2026, to finalize the implementation of KSeF 2.0.
- During the downtime, basic authorizations can still be requested via the ZAW-FA form, and from January 28, 2026, KSeF 2.0 services can be tested in the production environment.
- KSeF 2.0 will become the only available and mandatory system from February 1, 2026; KSeF 1.0 and its modules will be discontinued.
- New authorizations and certificate applications will be possible again in KSeF 2.0 starting February 1, 2026.
- Taxpayers must obtain certificates or assign authorizations via MCU by January 25, 2026; after that, these actions will only be possible in KSeF 2.0.
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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