Find below the direct quote from the IRS Small Business and Self-Employed Website
S Corporation Compensation and Medical Insurance Issues
Treating Medical Insurance Premiums as Wages
Heath and accident insurance premiums paid on behalf of the greater than two percent S corporation shareholder-employee are deductible and reportable by the S corporation as wages for income tax withholding purposes on the shareholder-employee’s Form W-2.
These benefits are not subject to Social Security or Medicare (FICA) or Unemployment (FUTA) taxes. The additional compensation is included in Box 1 (Wages) of the Form W-2, Wage and Tax Statement, issued to the shareholder-employee, but would not be included in Boxes 3 and 5 of Form W-2.
A 2-percent shareholder-employee is eligible for a deduction in arriving at Adjusted Gross Income (AGI) for amounts paid during the year for medical care premiums if the medical care coverage is established by the S corporation and the shareholder meets the other self-employed medical insurance deduction requirements. A deduction used to arrive at AGI is referred to as an above-the-line deduction. If, however, the shareholder or the shareholder’s spouse is eligible to participate in any subsidized health care plan then the shareholder is not entitled to the above-the-line deduction.
A medical plan can be considered established by the S corporation if the S corporation paid or reimbursed the shareholder-employee for premiums and reported:
•The premium payment
•Reimbursement as wages on the shareholder-employee’s W-2