Since November 3, 2025, the Ministry of Finance has made the test environment of the KSeF 2.0 Taxpayer Application available.
The test version provides the functionality that will be available in the production version released on February 1, 2026. Actions taken in the test version have no legal consequences.
The Ministry of Finance provides technical support for users of the test environment through the KSeF support form. The KSeF 2.0 Taxpayer Application is free software offered by the Ministry of Finance for issuing and receiving invoices compliant with the KSeF 2.0 system. It can serve as an alternative to any invoicing program on the market integrated with the KSeF 2.0 API. The Ministry of Finance has planned testing of the environment so that users can familiarize themselves with the functionalities offered by the application.
Starting from November 3, 2025, you can:
- familiarize yourself with the provided software,
- test the application’s functionalities without limitations,
- report potential errors in the application.
In the test environment, users can use any fictional data. None of these activities have legal consequences. Data in the test version of the Taxpayer Application will be periodically deleted.
Thanks to feedback from users, the test version of the KSeF 2.0 Taxpayer Application may differ from the final product, and its performance will be optimized until the production launch on February 1, 2026.
The KSeF 2.0 Taxpayer Application made available in the test version is integrated with the test (integration) environment of the KSeF 2.0 API.
The test version is available at: 
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