I am Resident Alien F1. My husband has F2 but only stayed in US for half a month in 2018 (thus he had no US health insurance).
He had F1 from 2015 to 2017, then changed to F2 in late 2017. He has SSN, and his only US income in 2018 was state refund from 2017 tax return (itemized deduction). He is now working in my home country, and had income there for 2018.
Does he need to file US tax return?
If we file jointly, will his income outside US be taxed for US tax?
