Even if they owe 0 (which is very likely), a Dependent has to FILE a tax return if they meet any of the below requirements which are published on the IRS website.
Filing requirements for dependents is in publication 501:
You must file a return if any of the following apply.
1.Your unearned income was more than $1,100.
2.Your earned income was more than $12,200.
3.Your gross income was more than the larger of— a.$1,100, orb.Your earned income (up to $11,850) plus $350.
