- In 2026, businesses can issue invoices using the National e-Invoice System (KSeF) online or in three offline modes.
- The offline modes include offline24, offline due to system unavailability, and a complete failure mode.
- Invoices must be sent to KSeF the same day if online or by the next business day if offline.
- The Ministry of Finance has provided guidelines for these changes.
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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