KSeF — e-invoicing that already applies
Since February and April 2026, invoices in scope are as a rule issued through the National e-Invoicing System (KSeF); in online mode the issue date is the date they are sent to the system, while offline modes follow separate rules. We check whether your contracts, document flow and KSeF permissions are ready — before administrative penalties of up to 100% of the invoice VAT start in 2027.






