S-corp owners get a different tax treatment for health insurance than sole proprietors, and getting the setup wrong can cost you the deduction. The mechanics are not complicated once you know the rules, but they have to be followed in the right order. This guide covers how it works in plain terms. It is general information, not tax advice, so loop in your CPA.
If you own more than 2% of your S corporation, the IRS treats you like a partner rather than a regular employee for fringe benefits. That means health insurance premiums are not simply a tax-free benefit the way they are for rank-and-file employees. Instead, the premiums go through a specific reporting process that lets you deduct them on your personal return.
The usual approach is that the S corporation pays the premiums, or reimburses you for premiums you paid, and then includes the amount in your W-2 wages in Box 1. The amount is generally not subject to Social Security and Medicare tax, so it does not appear in Boxes 3 and 5. You then claim the self-employed health insurance deduction on your personal return for the same amount.
The key point is that the plan has to be established by the company, meaning the S corp pays or reimburses the cost and reports it. If you pay premiums personally and the company never reimburses or reports them, you may lose the deduction. Ask your CPA to confirm the process before the first premium is paid.
The deduction is limited to the earned income you receive from the S corp, so your wages need to be high enough to support it. You also cannot claim it for any month you or your spouse were eligible for an employer-subsidized plan. Because the rules interact with your salary and your tax return, this is a conversation to have with both your CPA and your broker.
If your S corp has employees other than you and your spouse, a small group plan may be available, and it can cover you alongside your team. If you are the only employee, most carriers will not write a group plan, so the usual route is an individual ACA plan that the company pays for or reimburses, reported as above. Our guides on group insurance for one employee and ICHRA vs QSEHRA vs group plans walk through those choices.
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Often yes, if the S corp has at least one W-2 employee who is not the owner or the owner's spouse. Carrier rules vary, so check with a broker before assuming.
Generally yes. For a more-than-2% shareholder, premiums paid or reimbursed by the S corp are reported in W-2 Box 1, and the owner then takes the self-employed health insurance deduction on their personal return.
Generally no. When the plan requirements are met, the premiums are included in Box 1 but not in Boxes 3 and 5. Confirm with your CPA.
That can work if the S corp reimburses you and reports the amount properly. If the company never reimburses or reports it, you risk losing the deduction.
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