If your son actually paid more than half of his own support then he won't qualify to be your dependent and you can delete him from your return. Please see Worksheet for Determining Support to help to check if he actually paid more than half of his own support.
Please be aware if he meets all requirements to be your dependent then he is your dependent. You cannot just choose to claim or not claim him. Please see Who can I claim as my dependent? for details.
If he truly isn't your dependent then he will have to select that he cannot be claimed as a dependent on his return:
- Login to your TurboTax Account
- Click “My Info” tab in the black bar on the left side of your screen.
- Click “Edit” next to the name.
- Scroll down to the first question in Section 3: “A few other things we need to know”
- Select "No" to the question "Someone else can claim me as a dependent on their tax return"
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