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• Poland confirms KSeF mandatory e-invoicing schedule

  KSeF becomes mandatory for large taxpayers on 1 February 2026 and for all other businesses on 1 April 2026.

• Belgium's B2B e-invoicing mandate is live

  Since 1 January 2026, structured e-invoicing is mandatory between Belgian VAT-registered businesses, with Peppol BIS as the default standard.