- Structured invoices issued via KSeF cannot be annulled, neither now nor from February 1, 2026.
- Sending an invoice to KSeF is equivalent to introducing it into legal circulation, which excludes the possibility of annulment.
- If a KSeF invoice is issued by mistake, it can only be corrected (e.g., to zero), not annulled.
- Annulment is only possible for invoices not introduced into legal circulation, which does not apply to KSeF 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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