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, all the information must be in the KSeF XML.
- 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/

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. KSeF test : currently not possible to get a certificate with you NIP number.
Billit company verification or Billit Bank Account verification (one of both)	x	x	https://docs.billit.be/docs/verification-of-a-non-belgian-company

This is possible based on newest FA(3) format since February 1, 2026.

If there are not enough rights, then invoice sending/receiving will not succeed.

You can Check on KSEF portal what is the status, steps:

Log in to KSeF Portal
Go to Uprawnienia (Permissions / Authorisations)
Choose Zarządzanie uprawnieniami (Manage authorisations)
Select:
- Podmiot (entity / company), or
- Osoba / Certyfikat (person or qualified certificate)

You can assign, modify or revoke rights such as :

Rights can be granted to: