Definitely can relate to headaches getting TurboTax to show healthcare credit and deduction values that made sense.
Phase I: Inadvertently entered the medical premiums in both the business health insurance deductions step-by-step *and* the PTC credit calculations step-by-step. (Slight difference in the two entries given the ever-so-slightly lower 1095A column A figure.) Ended up with a too-high figure in deductions that was about 160% more than what the total I paid for all healthcare insurances. And then there was a credit on top of that. Knew that couldn't be right.
Phase II: "Fixed" the business health insurance deduction by only leaving in the dental insurance there. 1095A stuff stayed in the credit calculation section. However, deductions plus credits ended up something in the order of $300 or so short of total premium expenditures.
Phase III: Added a line entry in the business health insurance deductions above my dental insurance entry for the $3 of premium insurance that was "not allowed" on the 1095A column A total. Note that my 1095 A figure was about $3 less than what I actually paid for the medical health insurance premiums, because some portion of my premiums were not deemed to be "essential medical benefits," and therefore were not eligible for the credit calculation. (Maybe there was a bit of vision benefit or health promotion hidden in my medical premiums?) Result was that suddenly the TurboTax total of my health insurance deduction plus the ACA credit came within $5 (rounding error?) of my actual total healthcare insurance expenditures.
Reflections: (1) The iteration calculations in TurboTax appear to be *very* sensitive to any numbers being off. Surprising that adding in the missing $3 seems to have fixed the calculations in my case. (2) Be careful of accidentally double-entering the medical insurance in both the business insurance deduction and APTC credit calculation sections of Turbotax. (3) Watch to account for any little smidgen of your premium that was not accepted in the 1095A column A totals. (4) I struggled with the Ferguson calculator. It seems to assume that the only relevant figures are on the form 1095A, and not clear how to find the MAGI for the final entry box - especially if you have dental insurance or a sliver of non-ACA eligible medical premium.
Unique situation, so no clue if this would be relevant for others, and no clue if the TT iteration for the credit is low or off. Only know that the deduction + credit finally equaled total premium expenditures. Unfortunately, TT call-in help was not able to help me identify the double premium entry problem. I had to crawl the interwebs to discover that.
