Poland began testing the KSeF 2.0 electronic invoicing system on September 30, 2025, to prepare for its mandatory rollout. This testing phase allows for the integration of the National e-Invoice System with various commercial platforms using a new API. Mandatory electronic invoicing begins on February 1, 2026, for large businesses and April 1, 2026, for others. However, very small transaction businesses have an extended deadline, not needing to comply until January 1, 2027.
Source: answerconnect.cch.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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