@Carl - A couple of "fine points":
1. You do not have to be an undergrad; just a full time student under age 24.
2. If you qualify as your parent's dependent, you are subject to the kiddie tax, but not ONLY if you qualify as their dependent. The kiddie tax rule is: if you a full time student, under 24, and less than half your support comes from your earned income (and you're not married or an orphan).
