Just jumping in to share my experience in case it helps someone or their kids who have US citizenship. I always filed my taxes once I got my first part time job in high school--except for one year after college when I was traveling and volunteering. I looked through all the documentation and it seemed I didn't make enough to file so I didn't. However, a couple years later not filing counted against me when I was looking at mortgages and didn't qualify for the FHA mortgage. I have no clue if that's still the case, but it seems, especially now that there are so many online options to file, that it's worth doing every year as a just in case, even if you've made a paltry amount.