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/

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 (*1)	x	https://docs.billit.be/docs/verification-to-non-belgian-user

*1 : requirement to verify on sandbox environment will be removed very soon.

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: