Poland's Ministry of Finance recently held a press conference on the mandatory use of the National e-Invoicing System (Krajowy System e-Faktur - KSeF). The Ministry confirmed that the use of the KSeF to issue invoices is mandatory from 1 February 2026 for large taxpayers with sales exceeding PLN 200 million in 2024, and from 1 April 2026 for other taxpayers. However, small taxpayers with sales…