- Maintenance work is scheduled for API KSeF 1.0 and the Certificate and Authorization Module (MCU) on December 8, 2025, from 16:00 to 19:00.
- During this time, the production environment of API KSeF 1.0, the Taxpayer Application KSeF 1.0, and the Certificate and Authorization Module for KSeF 2.0 will be unavailable.
- Apologies for the inconvenience.
Source: podatki.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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