Poland's National e-Invoicing System (KSeF) is an IT
platform designed for issuing, transmitting, receiving, and storing
invoices. This system represents a revolutionary change in the way
invoices are issued in Poland. Its introduction will give tax
authorities much faster and easier access to information on
business transactions.
Invoices issued and stored in KSeF are uploaded to a central
database maintained by the Ministry of Finance, enabling tax
authorities to view documents almost in real time. KSeF will
gradually become mandatory for nearly all entities issuing invoices
in Poland, starting from 01 February 2026.
General information
KSeF forces businesses to issue invoices exclusively in
electronic form, using a standardised XML format. Once issued,
invoices are validated and assigned a unique identification number.
According to the Ministry of Finance, this solution will simplify
the invoicing process and reduce risks associated with invoicing
errors.
