expat tax

The price(not necessarily monetary) that you pay for being a foreign national while not understanding the local language or customs.

Person1: I'm not sure what this charge is on my receipt.
Person2: Do you know how to dispute it in french?
Person1: Nope
Person2: Well, it sounds they are charging you the expat tax.

Non-monetary example:
When you've already said "what?" 3 times and finally you just agree.