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Understanding Poland’s KSeF 2.0 API Documentation and FA(3) Structure: Key Changes and Released API Documentation

  • Launch of KSeF 2.0: On June 30, 2025, the Polish Ministry of Finance released the KSeF 2.0 API documentation and FA(3) logical structure, aiming for full automation in tax reporting and improved data accuracy for businesses and tax authorities, with mandatory implementation starting February 1, 2026.
  • FA(3) Logical Structure Enhancements: The new FA(3) structure replaces the previous FA(2) format, offering an expanded data set, improved validation rules, and comprehensive technical documentation to enhance invoice accuracy and compliance.
  • Integration Timeline and Preparation: A clear timeline for KSeF 2.0 implementation includes key milestones such as the availability of a test environment by September 30, 2025, and a mandatory rollout for all businesses by February 1, 2026, emphasizing the need for businesses to review documentation and adapt systems promptly.

Source RTCsuite


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