MY DEPENDENT HAD A JOB
If your dependent has a W-2 for his after-school job, summer job, etc. you do not include the information on your own return. You can still claim your child as a dependent on your own return. He/she can file his own return for a refund of some of his withheld wages (he won’t get back anything for Social Security or Medicare), but MUST indicate on it that he can be claimed as a dependent on someone else’s return. (Supervise this closely or prepare it for him!)
If your dependent’s earnings were over $400 and were reported on a 1099Misc or 1099NEC then he must file a return and pay self-employment tax for Social Security and Medicare.
You might also want to use free software from the IRS Free File versions:
https://apps.irs.gov/app/freeFile/
There are certain cases where it is appropriate for you to include your dependent's income as part of your return instead of filing a separate return. In general, if your dependent did not have any earned income (such as wages reported on a W-2) and only needs to report unearned income (such as dividends and interest), then you may be able to include that income as part of your return.
Take a look at the following TurboTax help article for more details and restrictions that must be met to do this: