I don't know where the numbers come from, and how they are calculated, but I, too have found discrepancies between what I actually paid in premiums and what is calculated by TurboTax and entered on Line 29 of Form 1040. I have decided not to concern myself with the difference. Perhaps there's some other factor that goes into the calculation. If you are concerned, I'd ask to speak with a TurboTax specialist. There are different levels of help and I have found the folks on the more expert level to be super helpful as well as patient and kind. If the first person can't help, ask for your case to be escalated to a different department. Good luck!
