- It will not be possible to cancel (annul) an invoice issued in KSeF in 2026. Once a structured invoice is issued and sent to KSeF, it is considered legally circulated and cannot be annulled, even from February 1, 2026. Such invoices can only be corrected, for example, to zero if necessary, but not canceled.
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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