The premium tax credit depends in large part on your income. The self-employed health insurance deduction reduces your income, which in turns increases your premium tax credit. The problem is that you are not allowed to take the health insurance deduction to the extent that it increases your premium tax credit.
There is a complicated series of worksheets you have to use to determine what amount of your premium tax credit and self-employed insurance deduction are allowed.
If you use the desktop version of TurboTax you can see the worksheets and compare them with the results you can calculate manually per the instructions to form 1040 if you want to verify the accuracy of the calculations in TurboTax.
Here is a link to the instructions to form 1040:
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
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