No, you are mistaken. Any money deducted from your paycheck (and then appearing on your W-2, line 12, letter W is NOT deductible because you never paid taxes on it to start with. Thats what the other user was trying to explain. Your gross was reduced on your paycheck by the amount that you contribute before any taxes were withheld. You can only deduct any amount that you personally paid directly to your HSA, NOT amounts through payroll deduction. Obviously, I can't speak to your W-2. Perhaps, although it is unlikely, its incorrect. But the payroll deductions that went to your HSA are not deductible.
