General Info on KSeF

Scope for use From Polish company to a Polish Company

Sending to KSeF (Income) and Receiving from KSeF (Expenditure)
PDF :
- You cannot send your own attachments over KSeF.
- The only document used is a KSeF PDF. When sending via Billit, the KSeF PDF is generated by Billit. When receiving, the KSeF PDF is also receive.
Billit website page on Poland : https://www.billit.eu/en-int/peppol-access-point/peppol-ksef-e-invoicing-in-poland/

Make your Companies Ready for Use on KSeF

Activity	Sandbox	Production	Additional Info
Create company in MyBillit and register basic data	x	x	https://docs.billit.be/docs/basic-data
Register Bank Account in Billit	x	x	https://docs.billit.be/docs/basic-data
Fill in KSEF PDF Form		x	KSeF
Company Registration on KSEF	x	x	KSeF
KSeF download certificate for Billit integration	(x)	x	KSeF
Setup KSEF Integration in Billit and upload certificate	x	x	See Integration tile in Billit
Billit company verification / validation		x	https://docs.billit.be/docs/verification-to-non-belgian-user
Bank account verification/validation	x	x	https://docs.billit.be/docs/verification-to-non-belgian-user

When to activate KSeF-integration on Production?

This is only possible starting on February 1, 2026 (due to limitations on KSeF-level).

If you activate the integration (+ other steps) later the February 1, then there is no issue with supplier invoices, as all invoices available on KSeF will be downloaded by Billit.