- From 2026, most taxpayers in Poland must issue and receive structured invoices via the KSeF system. However, KSeF does not verify the substantive accuracy of invoices (such as dates, amounts, or NIP numbers). Errors or fraudulent invoices can lead to loss of VAT deduction rights for buyers and tax liability for sellers, regardless of intent. KSeF mainly serves as a platform for sending and archiving invoices, not for checking their correctness. Taxpayers remain responsible for invoice accuracy, and mistakes can result in financial penalties or criminal sanctions. The article provides examples of possible errors and highlights the risks and consequences of issuing unreliable invoices.
Source: ksiegowosc.infor.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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