When can invoices be sent with Peppol?
You can already! :) If you search for "Peppol" in our learning center (hat in the top right corner), you will find the step-by-step plan on how to activate Peppol.
I have activated it, but I don't see any difference in the way I send invoices now.
You really should try it out for yourself. Even if you don’t have a company number yet, you can already go ahead.