According to the amendment, taxpayers are expected to issue invoices in an XML format (FA_VAT) together with the ability to exchange and receive return messages from KSeF via API communication. Once the invoice is validated, an identifying number (UUID) will be assigned to each invoice, marking KSeF approval.
Important timelines
These are the timelines for e-invoicing via KSeF:
- October 2021-December 2021 – KseF pilot phase (not valid for tax purposes);
- January 2022 – v…