Hi gerdon, as a swiss you are probalby a devisen inlaender ( citizen or resident ). There are different rules for that. I am Canadian resident, ( tax payer too, for all those who think immigrants don't ), have an account in Vienna with a Bank. Had to send a copy of my EU Passport. Fees for Cedartree: 1.25 % per in/out trade and 0.2 % per year deposit fee on assets. If they have to deal let's say with Deutsche Bank on the Frankfurt exchange, there are some more fees, appr. EU 25.00.
Will sooner or later investigate a discount, online broker in Europe, to compare fees.