@dmertz I'm having the same issue for 2019 taxes. The IRS worksheet for calculating the deductible amount of the self-employed health insurance premiums compares the premiums with the amount of your net profit AND any other earned income. For a 2% shareholder in your S-corp, you (and the current version of TurboTax) correctly take W-2 line 5 Medicare wages for the other earned income. However, TurboTax does not include the shareholder's net profit that flows in from the K-1. My reading of the IRS instructions says both are to be used, since both end up as income, and the total is what should be used to cap the insurance premiums deduction. This will also match the guidance from the IRS under "S Corporation Compensation and Medical Insurance Issues".
