Yes, documents supporting the invoice can be added to an e-invoice as attachments.

Please note the following size and format specifications as well as the permissible file formats:

Size and format requirements:

  • Web-based data entry: Number of accompanying documents 200, maximum size of all attachments 11 MB
  • Upload: Number of accompanying documents 200, maximum size of e-invoice, incl. attachments 15 MB
  • Email: Number of accompanying documents 200, maximum size of e-invoice, incl. attachments 10 MB
  • DE-Mail: Number of accompanying documents 200, maximum size of e-invoice incl. attachments 10 MB
  • Web service via Peppol: Number of accompanying documents 200, maximum size of e-invoice, incl. attachments 15 MB

File formats of the attachments

  • PDF documents
  • Images (PNG, JPG/JPEG)
  • Text files (CSV)
  • Excel documents (XLSX)
  • OpenDocument spreadsheets (ODS)