- From February 2026, using the National e-Invoice System (KSeF) will be mandatory.
- If an invoice is issued as a PDF instead of through KSeF, the mistake cannot be undone.
- There will be no penalties for this error until 2027.
- The Ministry of Finance advises businesses to use the transition period to develop internal processes to ensure compliance.
Source: podatki.gazetaprawna.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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