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@LindaS5247 Thanks for the reply. With This I-bond cash out, his 1099-Int shows $1240 in box 1, which is less than $1300. And this is only income he has. No other interest, div or earned income (W-2). 

So in this case,

1. do we required to show this under our filing? 

2. if it is not required to report under our or his own file, and if we still show this under return, will we "penalized" with kiddie tax or any other tax?

Thanks