INVOICE

Last reviewed: 6 August 2026 Poland e-invoicing requirements entered their mandatory phase in 2026 through the National e-Invoicing System, known as KSeF. The largest taxpayers began issuing structured invoices through KSeF on 1 February 2026, most remaining taxpayers followed on 1 April 2026, and the obligation to receive applicable invoices through the system began on … Read more

Last reviewed: 5 August 2026. Belgium e-invoicing requirements changed significantly on 1 January 2026. Nearly all invoices covered by the domestic business-to-business mandate must now be issued as structured electronic invoices. Sending an ordinary PDF by email is no longer enough when the transaction falls within the mandate. This guide explains the current rules, who … Read more