I think I figured out where your $1 discrepancy might be from. TurboTax rounds up (or down) EACH month from your 1095-A entries to arrive at the figures it plops into form 8962. This rounding caused my calculations and TurboTax's calculations to be different by $5 when I was peering into the math of the Medical Expenses Worksheet and the value TT generated for that line 2b value. In your case, I'm guessing, but it could be that the rounding by TT creates a $1 difference for you if your method of calculating involved no rounding and used actuals from your 1095-A.
