1. Agree with you - but I think they're separate issues (apart from the German language post), ie can I simply swap the cart.php files?
2. True, I meant gross shipping costs. I updated to clarify that. Thank you for the pointer.
I'm not sure it's a bug in tb's AEUC, though. With PS cart.php everything works.
In my opinion, this is OK. The customer should know the gross shipping cost in advance, i.e. 4.80. The taxes for the shipping cost will depend on what's in the shopping cart.
The display of the net or gross shipping price in the invoice is a different matter.
Mind sharing?