If you own more than 2 percent of an S corporation, here is some good news: the rules for deducting your health insurance have not changed for 2026. Handle a few steps correctly and you can keep deducting coverage for yourself, your spouse, your dependents, and your children under age 27.
The mechanics matter, because this is an area where small mistakes cost real money. Your S corporation must either pay your premiums directly or reimburse you for them. It then reports that premium amount as wages in box 1 of your W-2, but not in boxes 3 or 5. From there, you claim the self-employed health insurance deduction on your personal return.
The most common misstep is compensation. Your deduction cannot exceed your box 5 Medicare wages. If you pay yourself little or no salary, you can lose part or all of the deduction even though the premiums show up on your W-2. A second trap involves family members who work in the business, because attribution rules can treat certain relatives as shareholders even when they own no stock, which changes how their coverage is reported. And if you reimburse non-owner employees for insurance they bought themselves, doing that outside an approved arrangement can trigger steep penalties.
It is worth seeing why the box 1 treatment is actually in your favor. The premiums get added to box 1 wages, so they are subject to income tax, but they stay out of boxes 3 and 5, so they escape Social Security and Medicare tax. You then deduct the same amount on your personal return before adjusted gross income. Done correctly, the income tax on the premiums is effectively cancelled by the deduction, while the payroll tax savings are real and permanent. Skip the reporting step, though, and you can end up paying tax on the premiums with nothing to offset it.
Timing is the other thing that trips owners up. The premiums have to run through payroll and land on your W-2 before the final payroll of the year, so this is a December task, not an April discovery. The deduction can also reach beyond major medical to include dental, vision, and, within limits, long-term care premiums, and Medicare premiums can qualify for shareholders who are on Medicare. If your spouse is also on the payroll, or you are funding a health savings account, the pieces interact in ways worth a short planning conversation before year-end.
What this means for you: This deduction is easy to lose on a technicality. Before year-end, let us confirm your salary supports the deduction and that your W-2 will be coded correctly. It is far cheaper to set up right than to fix later.
