- If a structured invoice in KSeF is issued with an incorrect buyer NIP, a correcting invoice (zeroing the original) must be issued, 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.
- All three documents (original invoice with incorrect NIP, correcting invoice, and new invoice with correct NIP) must be sent to KSeF.
- Structured invoices must be issued using the KSeF template; from February 1, 2026, this will be 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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