New e-invoice validations – here is what you need to know

En konsult sitter utomhus på en stentrappa och arbetar fokuserat vid en bärbar dator.
As of June 30, 2026, we are introducing two new validations for e-invoices.

The new validations are based on Peppol requirements, but apply to all e-invoices – regardless of format.
Why does it apply to all e-invoices? Consistent validations are easier to understand and troubleshoot. You shouldn't have to wonder why you get a validation error in some cases but not in others.

The new validations

Delivery country is required if a delivery address is specified

If an invoice contains any of the following fields, the delivery country must be specified:

  • Delivery address

  • Delivery address 2

  • (Delivery) Postal code

  • (Delivery) City

Do you need to adjust anything? Yes, if you create invoices with a delivery address via the API – make sure to always include the delivery country.


Delivery date is required for EU reverse charge

If an invoice has the tax type EU reverse charge, a delivery date must be specified. Peppol's formal requirement (BR-IC-11) is that either a delivery date or an invoice period must be included. Since the invoice period cannot be specified manually in Fortnox, we only validate against the delivery date.

Do you need to adjust anything? Yes, if you create invoices with EU reverse charge via the API – make sure that the delivery date is always included.