S-Corp Owners: The Health Insurance Payroll Rule You Can't Skip
More-than-2% shareholders have one path to deducting premiums — and it runs through the W-2.
If you own more than 2% of an S-corporation, your health premiums are only deductible through a specific ritual: the company pays (or reimburses) them, adds the amount to your W-2 wages, and you take the self-employed health insurance deduction personally. Skip a step and the deduction evaporates.
How it works in practice
The premium amount lands in Box 1 of your W-2 (not Boxes 3 and 5 — it dodges payroll tax), your payroll provider needs to know before the last run of the year, and the deduction then comes off your 1040. Every payroll service handles this; almost none do it unprompted.
Buying the plan personally on the marketplace is fine — the reimbursement path preserves the deduction. What S-corp owners generally can't do is take marketplace subsidies while the corporation reimburses; the interactions are exactly why your CPA should see the setup.
The takeaway
This is a five-minute payroll configuration that saves real money every year, and a December discovery that costs a year's deduction. Have the conversation in January.
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