To submit supporting documents or attachments with your invoice, they must be embedded in the invoice data file and should not be sent separately as an email attachment. Documents of the following file types may be embedded: PDF documents (PDF), Images (PNG, JPEG, JPG), Excel spreadsheets (XLSX), Support and OpenDocument spreadsheets (ODS) and Text files (CSV) as well as XML when using an extension.

You have various options for embedding documents depending on the way you create your invoices and which transmission method you use to submit them to the Online Access Act-compliant Invoice Submission Portal (OZG-RE).

Create new invoice (via web submission)

If you create your electronic invoice manually (using the web submission form), you can manually add supporting documents of the accepted file types to the invoice. In the navigation bar at the top of the screen, click on “Additional documents”. This will open a page where you can select and upload the relevant documents from your computer, including via drag and drop. When you submit your invoice, the documents will be directly embedded in the invoice. Please note that the maximum number is limited to 200 documents and the size of all attachments is limited to 15 MB.

Upload invoice file

You can submit your completed invoice in the XML format using the function “Upload invoice file”. To attach supporting documents, you must embed them in the XML file encoded in Base64 before uploading your invoice.

For more information, contact your software provider to ask about options for embedding documents in electronic invoices. Please note that the maximum number is limited to 200 documents and the size of all attachments is limited to 15 MB.

Transmit via email

You can submit your completed invoice using email. To attach supporting documents, you must embed them in the XML file encoded in Base64 before submitting your invoice.

For more information, contact your software provider to ask about options for embedding documents in electronic invoices. Please note that the maximum number is limited to 200 documents and the size of all attachments is limited to 15 MB. Transmit via Peppol

You can submit your completed invoice using Peppol. To attach supporting documents, you must embed them in the XML file encoded in Base64 before submitting your invoice.

For more information, contact your software provider to ask about options for embedding documents in electronic invoices. Please note that the maximum number is limited to 200 documents and the size of all attachments is limited to 15 MB.