Our webshop is setup to use the Tax By Region setup. This works well if the customer is in the same country as our webshop is. However when you are a Guest user and set your country to another country say Germany (our shop is in the Netherlands) than the customer hasn't have to pay any taxes. However we do have setup the EU VAT setting so what i would expect is that when a customer has a account WITH a VALID Tax number THEN the taxes are not calculated. Else there always calculated.
Also marking the VAT number as Valid or Invalid at a customer doesn't have any effect.
I think this is a simpel setting somewhere that i'm overlooking so please see the attached images for our current settings.