On Friday, August 29, the Polish Ministry of Finance published important news regarding the KSeF (National e-Invoice System).
As of 1 September 2025, the KSeF 1.0 Test environment has been officially shut down. Therefore, from now on no further testing can be conducted in KSeF 1.0. In practice, this means that to become a new KSeF user, taxpayers must wait for the new KSeF 2.0 Test environment once this new environment opens. Users of the current Production environment of KSeF 1.0, can still use it until the maintenance break, which will occur between 26-31 January 2026.
This impacts any taxpayers currently issuing e-invoices in the KSeF 1.0 Testing environment.
What are the next steps towards KSeF 2.0:
- Test environment: the new Test environment for KSeF 2.0 will be launched on 30 September 2025, as expected, along with open API testing.
- Pre-production environment: from 15 October, users will be able to integrate with the Pre-production (DEMO) environment via the new API.
- Production environment: The Production version of KSeF 1.0 remains active until 26 January 2026, after which a technical break will occur. The KSeF 2.0 goes officially live on 1 February 2026.
- KSeF Certificates: will be available for download from 1 November 2025.
Want to understand more about e-invoicing requirements in Poland and how they will impact your business? Read our Sovos e-invoicing in Poland: B2B, B2G, KSeF dedicated webpage.
For future updates on Poland and similar developments in other countries, follow our Regulatory Analysis page.
