I never paid for SEPA transfers. Some countries are weird. I am not sure if it is still the case, but Germans had to pay a transfer fee when they used an ATM from another bank. In The Netherlands, you can use ATMs from any Dutch bank without extra cost. In fact, you can also use ATMs of German banks without additional cost. So, a having a Dutch debit card in Germany was/is(?) cheaper than a German debit card in Germany.