- The Ministry of Finance published technical documentation for the implementation of the National e-Invoice System with tools for integration.
- Companies and software providers can start preparing for system implementation in a test environment.
- Documentation and tools are available on the official website.
- API KSeF 2.0 documentation includes technical specifications, data structures, and examples.
- SDK libraries and a guide with code examples are available in Java and .Net.
- A comparison of changes between KSeF API 2.0 and KSeF API 1.0 is provided.
- The final version of the logical structure FA(3) for e-Invoices has been published.
- The structure was developed with input from tax experts, accountants, and software providers.
- Software providers are encouraged to familiarize themselves with the documentation starting in July.
- The system will become mandatory on February 1, 2026.
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.
