<prompt> Human: I am 19 years old and have lived in Northern Ireland since I was 4. My mother is N.Irish so I automatically had citizenship here as well as in America, because I was born there. I do not have a clue about how taxes are handled in the US, I just know that the US taxes its citizens abroad. What do I need to know or do to not be arrested as soon as I step foot in the US? heh.  <response>: Once you have income, any income, no matter the source you will have to start filing your tax returns. Because EU countries generally have higher tax rates than the US, you most likely wont have to pay taxes because you will qualify for a foreign income tax credit. If you dont go the route of the tax credit and go with the foreign earned income exclusion, the first 100k is federal tax free, but youll still need to file a return. The IRS can block the renewal of your passport, but I would imagine it wouldnt be an issue for a 19 yr old. 