What is KSeF and what is it used for?

/ What is KSeF and what is it used for?

KSeF (Krajowy System e-Faktur, the National e-Invoice System) is a government system used to issue, transmit, receive, share and store structured invoices. Once an invoice has been accepted, the system assigns it a unique KSeF number. Access is available to the taxpayer or to a person or entity authorised by the taxpayer, such as an accounting firm.

Last update : 20.10.2026

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