If his or her income was more than $13,850, which is the standard deduction for a single person, your 16 year old is required to file a tax return. If it is less than that, a tax return would not be required but if federal income tax was withheld, a tax return should be filed by the 16 year old to get a refund. The tax return should indicate that the 16 year old can be claimed as a dependent on someone else's tax return.
