qbteachmt
Level 15

Your topic's Title seems to be one question:

"If you are a W-2 wage earner and have a Sch C Business can you deduct SE Health Ins premiums"

Yes; that's exactly what happens for an S Corp greater than 2% shareholder-employee.

Read about it here: https://www.irs.gov/publications/p535#en_US_2020_publink1000208843

"on Line 10a of the Form 1040 derived from Sch 1 Line 16?"

It carries over as deductible, up to the net income from the related business; the rest would carry over as part of itemized.

The Body of this topic seems to be a different issue entirely:

"it may be more beneficial to claim those premiums as an SE health insurance deduction instead of an itemized deduction."

Medicare coverage is treated the same, as would be marketplace coverage..

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