KSeF: the smallest businesses join on 1 January 2027

Since 1 April 2026, KSeF - Poland’s National e-Invoicing System (Krajowy System e-Faktur) - has been mandatory for all businesses and invoice issuers, except the smallest firms whose total sales documented by invoices do not exceed PLN 10,000 a month.

Those businesses will join KSeF on 1 January 2027. If you run a small business and still issue invoices outside the system, now is a good time to prepare - ask us about the details next time you’re in touch.

Source: ksef.podatki.gov.pl - KSeF implementation stages (in Polish)