I'm having the same problem -- credit and deductions figured by TurboTax don't add up to total premiums. I found the link below helpful. The Ferguson source is good--use it. I figured out credit and deductions using IRS instructions. It took me several hours and made my head spin--I felt I was going in circles and I was because it's an iterative calculation. I got the same answer as the Ferguson online calculator within about 10 dollars. But now I don't know how to override TT forms to enter a different AGI for premium tax credit (doesn't seem possible). And I understand that if I do, the tax forms won't be accepted online. TT seems to be lagging on this. It looks to me that the gain if we get this right will be about $250. Can't shrug that off. We may have to fill out our tax forms and send them in by mail. Hard to believe! I'll call TurboTax -- maybe they'll give a partial reimbursement? Basically the software isn't working properly for at least some self-employed people who bought health insurance through ACA. If you find out more, please share.
https://thefinancebuff.com/when-tax-software-gives-self-employed-wrong-aca-premium-subsidy.html
