E-invoicing in KSeF from 2026 – rules for foreign currency, advance and corrective invoices
The introduction of mandatory e-invoicing through Poland’s National e-Invoicing System (KSeF) is one of the most significant changes to the Polish tax system in recent years. From 2026, most VAT taxpayers will be required to issue structured invoices in a unified format and submit them to a central system acting as a repository of sales…










