Hello there, @gtobias,

I've come to share some clarifications with changing the billing address on an invoice.

When you create a new invoice for the same customer, QuickBooks automatically fills in the original billing address. If you edit the address through the invoice page, this won't change the information entered on the customer profile.

If you permanently want to change the billing address, you need to edit it through customer details on the sales page.

That will clarify your concern for today. Let me know if there's anything I can help you with. Don't hesitate to leave a comment below. I'm always glad to help.