- If a structured invoice in KSeF is issued with an incorrect buyer NIP, a correcting (zeroing) invoice must be issued, followed by 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.
- All three documents—the original invoice (with incorrect NIP), the correcting (zeroing) invoice, and the new invoice (with correct NIP)—must be sent to KSeF.
- Structured invoices are assigned to the buyer’s account in KSeF based on the NIP, which is not verified by the system.
- From February 1, 2026, issuing structured invoices in KSeF will become mandatory for most taxpayers.
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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