Thank you, Dawn! Now I think I understand. @DawnC
One more follow up question for you to make sure that I understand this correctly.
I later found out a place to enter Child's income, but for some reason it said that I didn't need to report that as it was below $1,100. But if I understand you correctly, income from1099-NEC is considered as self-employment, so if the net income is over $400, my son should file a separate report by himself, right? But when his gross income is less than $1,100, even if his self employment net income is more than $400, he doesn't need to file his own tax return, right? @DawnC
