As invoice issuers, we must comply with the deadline for issuing invoices stated in the VAT Act. The date of issue for a structured invoice is typically the day it is sent to the KSeF system, not the date indicated by the issuer or generated in an external accounting system. Sending an invoice to KSeF does not guarantee successful issuance; it is confirmed by the assignment of an invoice identification number and official confirmation of receipt in KSeF. If the KSeF system fails, offline invoices can be issued with the date indicated by the taxpayer. Visualization of a structured invoice can include additional elements like logos or marketing information, as long as it complies with the logical structure. Invoices should be marked with a QR code for verification purposes within KSeF. Optional fields on invoices should be carefully considered before providing specific information, such as PKWiU symbols or transport details.
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