UPO

Official acceptance receipt from Poland's KSeF.

Definition

The UPO is an electronic document generated by the central system attesting acceptance of the e-Faktura. It carries the invoice's Numer KSeF and the exact date/time of registration, and is the proof of the moment the invoice is deemed issued and received. It can be downloaded as machine-readable XML or as a PDF visualisation, and must be retained.

Origin

Defined in the Krajowy System e-Faktur documentation (UPO template) published by the Ministerstwo Finansów on ksef.podatki.gov.pl.

Example in context

<Potwierdzenie><NumerKSeF>1111111111-20260620-A1B2C3-7A</NumerKSeF><DataPrzyjecia>2026-06-20T14:05:11</DataPrzyjecia></Potwierdzenie>

Related terms

• KSeF — system that issues the UPO.
• Numer KSeF — identifier echoed in the UPO.