- If a structured invoice in KSeF is issued with an incorrect buyer NIP, a “zeroing” corrective invoice must be issued (structured or offline), then a new invoice with the correct NIP.
- From February 1, 2026, the buyer cannot correct the invoice with a correction note, regardless of their KSeF status.
- Three documents must be sent to KSeF: the original invoice with the wrong NIP, the zeroing corrective invoice, and the new invoice with the correct NIP.
- KSeF assigns invoices to buyers based on NIP and does not verify its correctness.
- From February 1, 2026, all such invoices and corrections must be structured 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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