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.