This is one of the most mentally taxing (pun intended) parts of being a US expat.
Unfortunately, the US is one of the few countries in the world that requires its citizens to file taxes abroad, even if someone might have been born a US citizen but never lived in the US.
The good news is you likely don’t owe anything if you earn below six figures. Even beyond that point, you might not owe anything, but the filing process can be a hassle.
