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Poland will implement mandatory e-invoicing via the KSeF system in two phases—starting February 1, 2026, for large enterprises with sales over PLN 200 million, and April 1, 2026, for all other businesses.
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In June 2025, Poland released updated documentation for KSeF 2.0, including a new FA(3) invoice schema, revised API guidelines, and integration testing plans to support businesses preparing for mandatory e-invoicing compliance.
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Poland’s e-invoicing journey began with voluntary KSeF use in 2022, followed by legislative backing, EU approval, and multiple timeline revisions based on business consultations and system readiness concerns.
Source: www.avalara.com
