I voluntarily abandoned my green card status my sending form I-407 in December 2019. However, I only received acknowledgement end of Feb 2020 from USCIS that they received the form and it had been acknowledged.
Moved to Singapore in mid summer 2018 and haven't re-entered the US in 2020. Do I still need to file US taxes for 2020 and do i need to file for the full year or only for Jan & Feb 2020?
