Poland Finalizes KSeF 2.0 Updates and API Specs, Implementation Set for February 2026

• Poland’s Ministry of Finance confirmed the KSeF implementation timeline on March 31, 2025.
• Final KSeF 2.0 API documentation and FA_VAT(3) schema were published in June and July 2025.
• Guidelines on QR codes, offline modes, and KSeF certificates were released.
• FA_VAT(3) schema will replace FA_VAT(2) on February 1, 2026, with updates to code formats and data types.
• New features include e-invoice attachments and new identification markers.
• API documentation for KSeF 2.0 includes OpenAPI 3.0.4 format and interactive documentation.
• KSeF 2.0 TEST environment available from September 30, 2025.
• Four offline modes and two types of QR codes will be available.
• Eligibility and application process for KSeF certificates clarified.
• Technical and legal updates are under review in the Lower House of Parliament.
• Official adoption and enactment expected by the end of July 2025.
• Taxable persons and developers should monitor for further announcements.

Source: vatabout.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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