Poland Feb 2026 B2B KSeF e-invoicing
1st February 2026: 2-phase mandatory KSeF B2B e-invoicing The Polish Ministry of Finance has confirmed the early 2026 launch of mandatory KSeF e-invoicing: 1 Feb 2026: large taxpayers, over PLN 200 million (€46m) per annum turnover in the previous year; and 1 Apr 2026: other