When applying both the self-employed health insurance deduction and the premium tax credit, keep in mind that you can't double dip. The combined amount of deductions and credits cannot be greater than the total of your eligible premiums.
There are two methods of calculating the Self-Employed Health Insurance deduction, the Simplified Calculation Method and the Iterative Calculation Method.
If Form 8962 is generating with a Premium Tax Credit and you have a SE health insurance deduction on 1040, line 29, then your deduction and credit may be adjusted. This adjustment is based on the calculations described in Revenue Procedure 2014-41 and Publication 974. Form 8962 should be reviewed.
Here's a TurboTax article about deducting health insurance when you're self-employed.
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