Runt,
While we cannot see your return in this forum, a very good thing, if you are using a Desktop version of TurboTax, you would switch to Forms View and track it down directly. With an Online version, you have the opportunity to save and view a PDF of your return before having to e-file but after paying the e-file fee. Examine that PDF to see where that extra tax came from and if that looks squirrely then simply go back to the relevant part of TurboTax check and correct if necessary before going back to the e-file dialogue. Do the actual e-file only when you are absolutely convinced you understand everything in question.
