Assuming you are the parent and are not the undergraduate student:
***THE*** most common reason for this is because *you* told the TurboTax program that the student did *NOT* live with you for "the whole year". Read the small print on the screen that asks how many months the student lived in your household, then select "the whole year".
The SECOND most common reason is because you answered the support question wrong. That question gets answer wrong, because the reader may have read the question, but did not "correctly" comprehend it. The question is asking if the ***STUDENT*** provided more than half of *THEIR OWN* support. You have to answer that question NO. Many people incorrectly comprehend that question as asking if the parent provided more than half of the student's support, and then incorrectly answer that question YES. There is absolutely no requirement what-so-ever for the parent to provide the student any support. The support requirement is on the student. Additionally, it is *not* *common* for an undergraduate to provide more than 50% of their own support and any undergraduate who claims to have done so can expect to be audited on it 24-36 months down the road after filing.
So if you made either one of the above two possible mistakes, you basically told the program that *you* do not qualify to claim *any* education credits or deductions for your dependent student.
