The National e-Invoicing System (KSeF) in Poland will allow for backdating structured invoices. New regulations will let you set an earlier invoice date than the actual submission date to KSeF, and this practice will be legal starting in February 2026. However, while backdating won’t be illegal, it can have significant and unforeseen consequences for taxpayers. The tax authorities will still receive all information from the e-invoices, and penalties for backdating will remain in place.
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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