TurboTax does not look at your income or anything else to determine whether you can be claimed as a dependent. The way it determines whether you can be claimed as a dependent is by asking you. At the very beginning of the interview, after you enter your name, birth date, and Social Security number, the next screen asks you if certain situations apply to you. One of the situations that's listed is that another taxpayer can claim you on their tax return. If you check that box, you have told TurboTax that you can be claimed as a dependent. If you don't check that box, you have told TurboTax that you cannot be claimed as a dependent. That's the only way TurboTax knows whether or not you can be claimed as a dependent.
Go back to the Personal Info section and see if you checked the box that says another taxpayer can claim you on their tax return. But if you don't check the box, make sure you're right. If you say that you cannot be claimed, and someone else claims you, it will cause trouble for them or you or both.
