Declining to accept paper and PDF invoices is already a reality in the Nordic countries. Many more corporations, municipalities and state treasuries are starting to refuse paper invoices as e-invoicing provides a more efficient alternative.

The article written by Johanna Andersén (Nordea, Nordic Head of Payment & Collection Services) can be found from GT News website: http://www.gtnews.com/article/7895.cfm 

Also, see the list of organisations who have set a deadline for receiving paper invoices:
http://realtimeeconomy.net/wiki/show/1/Progressive_organisat ions