Self-employed health insurance deduction amount doesn't make sense to me

[user00]

I get my insurance through the Marketplace. I entered the info from form 1095-A in the correct place, but I can't figure out how it adds up with the amount on Schedule 1, Line 17. How is the amount on Sch. 1, line 17 figured if you get a subsidy from the marketplace (form 1095-A)?

[DavidD66]

The amount that transfers to Schedule 1, line 17 from should be the premium amounts you paid, less any advance payment of the Premium Tax Credit (PTC), and then further adjusted for any repayment of the PTC required.  If a repayment is required it will be on Form 8962 line 29, and that will flow to Form 1040, Schedule 2, line 1a.  In addition, the deduction for self-employed health insurance cannot exceed the amount of net profit from Schedule C.  

[user00]

Thanks for the clarification.