You do not report his income on your return*. If it has to be reported, at all, it goes on his own return. If your dependent child is under age 19 (or under 24 if a full time student), he or she must file a tax return for 2022 if he had any of the following:
- Total income (wages, salaries, taxable scholarship etc.) of more than $12,950 (2022).
- Unearned income (interest, dividends, capital gains, unemployment, taxable portion of 529 distribution) of more than $1150 (2022)
- Unearned income over $400 (2022) and gross income of more than $1150 (2022)
- Household employee income (e.g. baby sitting, lawn mowing) over $2300 ($12,950 if under age 18)
- Other self employment income over $432, including money on a form 1099-NEC
If none of the 1099-Bs show a gain of more than $1150, technically he does not need to file a tax return. But he may want to file anyway to head of an IRS inquiry and to document his capital loss carry forward.
*If his only income is from interest and dividends, Alaska PFD or capital gains distributions shown on a 1099-DIV, there is a provision for entering it on your return, using form 8814. The fact that he has a 1099-B prevents you from using this option
