KSeF 2.0 Testing Begins: Early System Failures and Authentication Issues Reported

• Testing of the KSeF 2.0 demo environment began, but users quickly encountered authentication issues, especially with the qualified seal method.
• The system only allowed authentication with the qualified seal starting last Friday afternoon, causing frustration among early testers.
• Processing of structured test invoices was slow, and errors were frequently reported to the Ministry of Finance.
• The Ministry of Finance has not yet responded to inquiries about these problems.
• The mandatory use of KSeF for large taxpayers starts on February 1, 2026, with all contractors required to receive invoices through the system.

Source: podatki.gazetaprawna.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.

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