(1) I am trying to find out whether one has to file any income tax if they are an American citizen permanently living abroad but having literally no income?
(2) While trying to search about this on the internet, I wondered why is there no tax bracket with 0% or nil income tax (the UK doesn't tax income upto £12,500 for example). This means that people earning below that threshold are exempt from paying tax. Is there no such Nil or 0% tax thing in the US? So many countries have this minimum threshold income where no filing of income tax is required. Even countries like India have such policy. But I can only see that in the US you have to pay 10% tax minimum no matter how less you earn.
I would really appreciate if you could help me regarding those 2 questions.