The Council of the European Union published the project of the consent for the obligatory e- invoices system (KSeF) in Poland to be introduced as from 1st January 2024. Initially, the obligatory e- invoices were to apply from 1st January 2023, but finally this will happen only in 2021.
It is worth to mention that as from 1st January 2022, all entities in Poland can use the KSeF on a voluntary basis so this possibility will be extended till January 2024.
Source Intertax