The obligation to issue invoices in KSeF is being introduced in stages: from 1 February 2026 for taxpayers whose gross sales in 2024 exceeded PLN 200 million, and from 1 April 2026 for all other taxpayers. Until the end of 2026, a temporary relief applies to taxpayers whose monthly sales documented by invoices do not exceed PLN 10,000 gross. Receiving invoices through KSeF has been mandatory since 1 February 2026.


