You've said - "You probably have to file an U.S. income tax return if you received a W-2 and had income from U.S. stocks."
SO my CA did file for me based on above two but its non resident return.
This means lets say I had 1000$ on W2 and 10000$ on 1099 -> I ended up fully paying taxes in US on both of these even while being non resident. Now I am wondering if that is wrong because I was not resident of US.
For the whole year I was resident of another country ABC. Should I show tax credit in ABC now because I already paid taxes in US? (I did US tax filing first and now need to prepare for country ABC)
Overall I am worried that my CA made me file US tax non-resident return and paid full tax there - while I was actually resident of country ABC for that tax year.
Note on social security tax:-
My understanding is $1000 on W2 form does contain tax wittheld in federal, social security etc. I ended up paying tax on all my wages based on payslips. I do understand that they shouldn't withhold social security as I am non resident but I exited US after being employed in US for first 15 days of Jan 2020. At that moment it was not known I would end up being non resident for whole year (and won't return). The social security amount is probably another sub-topic.
