Yes, he needs to file his own tax return to report self-employed income greater than $400 (gross income minus expenses). When his return is filed, be sure to indicate that he is being claimed as a dependent on another return.
You cannot include this income on your own return because it is earned income. Parents may only claim certain unearned income on their own return for their dependents.
To learn more, see the following TurboTax help articles:
Do I need to file a federal return this year?
Do I need to file my own taxes if I'm a dependent?
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