- The KSeF 1.0 Test environment was shut down on 1 September 2025
- No further testing can be conducted in KSeF 1.0
- New KSeF users must wait for the KSeF 2.0 Test environment
- Current KSeF 1.0 Production environment users can use it until 26-31 January 2026
- KSeF 2.0 Test environment launches on 30 September 2025 with open API testing
- Pre-production environment available from 15 October 2025 for integration via new API
- KSeF 1.0 Production environment remains active until 26 January 2026
- KSeF 2.0 goes live on 1 February 2026
- KSeF Certificates available for download from 1 November 2025
Source: sovos.com
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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