The Polish National e-Invoicing System (KSeF) becomes mandatory for large businesses in February 2026 and for others in April 2026. The new KSeF 2.0 introduces several offline modes to allow for invoicing during technical issues, including a dedicated mode for planned maintenance and an emergency mode for unexpected outages. In these situations, taxpayers can issue invoices with special QR codes, which must then be sent to the KSeF system later. In the event of a total system failure, paper invoices can be used, with varying deadlines for submission depending on the specific offline mode.
Source: crido.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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