- From 2026, large and small companies in Poland must use the National e-Invoice System (KSeF). The Electronic Invoicing Platform (PEF) is already used for public procurement. Businesses are concerned whether they will need to send invoices twice—once to PEF and once to KSeF. The answer is no: if an invoice is sent via PEF (or Peppol) and meets the required standard, it will automatically be forwarded to KSeF and treated as a structured invoice. Companies do not need to duplicate the process. Integration between PEF and KSeF ensures that sending an invoice to PEF is enough; it will be passed to KSeF automatically. However, companies must ensure their invoices comply with the EN-16931-1:2017 standard and that their systems are properly integrated.
Source: crido.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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