Did the buyer download the KSeF invoice? Sellers get no report
Availability, downloading and UPO are different. What sellers can establish in Poland's KSeF and what it does not report.
KSeF does not tell the seller whether the buyer downloaded an invoice or how many times. No such confirmation does not mean the buyer has not downloaded it.
Availability versus downloading
In the ONLINE scenario discussed here, the invoice becomes available to the buyer when a KSeF number is assigned, provided their NIP is correctly entered in buyer details. This is not a download report. The buyer or an authorised person or entity can download the same invoice repeatedly; the seller receives no system information about those downloads. Source: Ministry handbook §6.5.
UPO is not a read receipt
Urzędowe Poświadczenie Odbioru confirms receipt of an electronic document by KSeF. It is not a report that the buyer downloaded or read the invoice, nor confirmation that they accepted its content. Interpret individual UPO data with the transmission mode in mind.
For a discussion with the buyer, prepare the KSeF number, invoice number and buyer details, and ask whether they can locate it. This is a practical approach, not a legal finding about service or payment.
FAQ
Can the seller see the number of downloads?
No. KSeF does not tell the seller whether the buyer downloaded the document or how many times.
Can the buyer download it again?
Yes. The buyer or an authorised person or entity can download the same invoice repeatedly.
Does no download report mean no access?
No. Such a report is not system information available to the seller, so its absence establishes neither access nor downloading.
Source and limits
KSeF 2.0 handbook, part II, §4.2 and §6.5, August edition, checked 7 October 2026; cover legal position: 1 February 2026. Polish-system scope; no legal-service conclusions, payment deadlines, VAT or offline modes.