It depends on the dollar amount.
You may have to file an income tax return for your child if their unearned income (interest, dividends, capital gains, etc.) exceeds $1,100.
For 2019, a child must file Form 8615 if all of the following conditions apply:
- The child has more than $2,200 in unearned income
- The child is required to file a tax return
- The child does not file a joint tax return with a spouse
- At least one of the child's parents is alive
- The child is within certain age limits
For tax purposes, the child's "age" is the age on December 31. The child must file the form if any of these conditions apply:
- The child is under 18 at the end of the year
- The child is 18 years old and does not have earned income that is more than half of the child's support for the year, or
- The child was a full-time student age 19-23 and does not have earned income that is more than half of the child's support.
Source: TurboTax FAQ
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