- The Ministry of Finance is introducing new, unified addresses for KSeF environments as part of preparations for KSeF 2.0 and enhanced IT infrastructure and security.
- The change is technical, affecting only service addresses, not API functionality.
- New addresses will be available from December 15, 2025, with a transition period; old addresses remain active temporarily.
- Integrators must switch to new test environment addresses by January 10, 2026; after this, automatic redirects will be in place until January 17, 2026, when old addresses are fully disabled.
- From February 1, 2026, the production environment will only be accessible via new addresses; the MCU service address remains unchanged.
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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