Poland’s KSeF E-Invoicing Mandate: Key Dates, Legislative Updates, and Compliance Requirements for Businesses

• Poland is moving forward with its KSeF e-invoicing system, with mandatory B2B e-invoicing starting in February 2026.
• The Ministry of Finance has released new legislative drafts and clarified the mandate following public feedback.
• The rollout schedule is confirmed: large taxpayers begin in February 2026, others by April 2026, with exceptions for certain small businesses until January 2027.
• Key milestones include final API documentation by June 2025, legislative completion by July 2025, and open API testing by September 2025.
• New legislative updates ensure GDPR compliance, permanent Offline24 mode for system outages, and new rules for attachments and structured data.

Source: vatit.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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