- KSeF 1.0 and KSeF 2.0 APIs are not compatible
- Only invoices and ownership rights migrate from KSeF 1.0 to KSeF 2.0
- New permissions and certificate downloads for KSeF 2.0 available via MCU from November 1, 2025
- Companies can report issues with KSeF 1.0 to [email protected]
- New functionalities added to KSeF 1.0 after consultations
- Integration with KSeF 2.0 test environment required, available from September 30, 2025
- Documentation for KSeF 2.0 integration available online
- Finance ministry preparing efficient test environment for KSeF 2.0
- KSeF 1.0 production version will not be further developed
- KSeF 1.0 available until technical break from January 26-31, 2026
- KSeF 2.0 becomes mandatory from February 1, 2026
- KSeF 2.0 test environment available from September 30, 2025
- New invoice structure FA3 and improved API for better integration
- Test environment allows checking authentication, encryption, and access management
- Companies can verify system compliance and optimize invoicing processes
- Ministry provides documentation, code examples, and training
- MCU available from November 1, 2025, for permissions and certificate applications
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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