Do I pay extra payroll tax on this?

No. When the premiums are paid under a plan that covers employees generally, the Box 1 amount is exempt from Social Security, Medicare, and FUTA. Box 1 goes up; Boxes 3 and 5 don't. The company deducts the premiums as compensation, you deduct them above the line, and no payroll tax attaches anywhere. It's purely a reporting requirement.

What if I already paid this year's premiums personally?

Fixable, as long as the year is still open. Under Notice 2008-1, the S-corp can reimburse you for the premiums before year-end and report the reimbursement in Box 1 of your W-2. Write the reimbursement check from the company account, tell payroll to add the amount as S-corp owner health insurance, and the §162(l) deduction is preserved. What can't be fixed is a year that's already closed with the premiums never having touched the company or the W-2.

Does this apply to my spouse on the plan?

If your spouse is simply covered under your policy, the premiums are already yours and follow the rule above. If your spouse works for the S-corp, family attribution treats them as a >2% shareholder too — so premiums the company pays for their own coverage also go into Box 1 wages, not through a pre-tax fringe arrangement. The same attribution applies to your children, parents, and grandparents on the payroll.

My S-corp has other employees — does anything change?

The mechanics for your own premiums don't change: company pays or reimburses, amount lands in Box 1, you deduct under §162(l). What does matter is that the premiums be paid under a plan — and once non-owner employees are in the picture, health coverage arrangements can raise ACA and nondiscrimination questions that are beyond this article's scope. If you cover yourself but not your staff, that design deserves a careful look before you rely on it.

I'm on Medicare. Do my Medicare premiums count?

Yes. Medicare premiums for a >2% shareholder follow the same pattern: the S-corp pays them or reimburses you, the amount is reported in Box 1 of your W-2, and you deduct it above the line under §162(l). Paying them personally and skipping the reimburse-and-report step forfeits the deduction the same way it does for a marketplace or group policy.

Can I just run my premiums through the company's cafeteria plan pre-tax?

No. A >2% shareholder can't participate in the company's Section 125 cafeteria plan at all — no pre-tax premium withholding for you, even if your employees use it. Your premiums take the Box 1 route instead. The end result is similar (premiums deductible, no payroll tax), but the mechanism is entirely different, and mixing the two up is one of the more common payroll setup errors.

Entity & S-corp

S-Corp Owner Health Insurance: The W-2 Rule That Decides Your Deduction

If you own more than 2% of an S-corp, health premiums the company pays for you must land in Box 1 of your W-2 — or the deduction is gone. Most owners find out at tax time, when it's too late to fix. Here's the rule, the payroll mechanics, and why September is exactly the right month to check.

6 min read · Published September 2026

Key Takeaways

A more-than-2% S-corp shareholder is treated like a partner for fringe benefits (IRC §1372). Health premiums the company pays for you aren't a tax-free fringe — they must be included in Box 1 of your W-2.
Box 1 inclusion costs nothing in payroll tax. Under a plan covering employees generally, the premiums are exempt from Social Security, Medicare, and FUTA — it's a reporting step, not an extra tax.
Once the premiums are on the W-2, you deduct them above the line on your 1040 as the self-employed health insurance deduction under §162(l). Done right, the round trip is income-tax neutral at the company and fully deductible personally.
Skip the W-2 step and the §162(l) deduction is gone. The only fallback is itemized medical expenses above the 7.5%-of-AGI floor on Schedule A, which for most owners means no deduction at all.
Family attribution applies: a spouse, child, parent, or grandparent of a >2% shareholder who works for the company is treated as a >2% shareholder too, and their premiums follow the same rule.
The fix is a payroll entry, and it has to happen before the final payroll run of the year. September is the right time to check; February is not.

Somewhere around February, a lot of S-corp owners learn the same fact in the same unpleasant way: the health insurance premiums they paid all year aren’t deductible, because a number that was supposed to be on their W-2 isn’t. The rule behind it is simple. The deadline for complying with it is the year’s final payroll run — which is why this is a September article, not an April one.

The rule: you’re not an employee for this purpose

If you own more than 2% of an S-corporation, IRC §1372 treats you like a partner — not an employee — for fringe benefit purposes. So when the company pays or reimburses your health insurance premiums, that payment isn’t a tax-free fringe benefit the way it would be for your staff. It’s compensation, and it must be included in Box 1 wages on your W-2.

That sounds like a penalty. It isn’t. When the premiums are paid under a plan covering employees generally, the Box 1 amount is exempt from Social Security, Medicare, and FUTA — Box 1 goes up, Boxes 3 and 5 don’t, and no payroll tax attaches. It’s a reporting step, not an extra tax.

The payoff: an above-the-line deduction on your 1040

Once the premiums show up in Box 1, you deduct the same amount above the line on your personal return as the self-employed health insurance deduction under §162(l). The company deducts the premiums as compensation, your W-2 income goes up by the premium amount, and your personal deduction takes it right back out. Run correctly, the whole loop is income-tax neutral at the company and fully deductible to you, with zero FICA cost.

The right way: $14,400 in premiums through payroll

Annual premiums the S-corp pays$14,400

Added to W-2 Box 1 wages+$14,400

Social Security / Medicare / FUTA on that amount$0

§162(l) above-the-line deduction on the 1040−$14,400

The premium rides through Box 1 and comes back out above the line. Net income-tax effect of the reporting loop: zero — which means the premiums end up effectively deductible against income tax with no payroll tax cost. The only way to lose is to skip the loop.

The failure mode: paying personally and hoping

IRS Notice 2008-1 is the governing guidance, and it requires two things: the S-corp must pay the premiums or reimburse you for them, and the amount must be reported as wages on your W-2. Pay the premiums from your personal account, never run them through the company or payroll, and neither condition is met.

No W-2 reporting, no deduction

If the premiums never flow through the S-corp and onto your W-2, the §162(l) above-the-line deduction is not available. The only remaining path is itemizing medical expenses on Schedule A, where they count only to the extent total medical costs exceed 7.5% of adjusted gross income. For most owners that floor is never cleared, and the deduction is simply lost for the year.

The tax code will let an S-corp owner deduct every dollar of health insurance — but only if the company writes it down twice: once when it pays, and once on the W-2.

Family attribution: your spouse on payroll is you

Ownership attribution extends the rule to family. A spouse, child, parent, or grandparent of a more-than-2% shareholder who works for the company is treated as a more-than-2% shareholder too. Premiums the company pays for their coverage follow the same path: into Box 1 of their W-2, then deducted on the 1040. Putting a spouse on payroll doesn’t create a back door to tax-free fringe treatment — the attribution rule exists specifically to close it.

Medicare premiums follow the same pattern

An owner enrolled in Medicare doesn’t escape the rule or lose the benefit. Medicare premiums count as health insurance for this purpose: the S-corp reimburses them, payroll reports the amount in Box 1, and the owner deducts them above the line. The reimburse-and-report choreography is identical to a group or marketplace policy.

Two adjacent rules worth knowing

No cafeteria plan for you. A more-than-2% shareholder can’t participate in the company’s Section 125 cafeteria plan. Your employees can pay their premium share pre-tax through withholding; you can’t. Your premiums take the Box 1 route described above instead.

HSA contributions ride the same rails. If the S-corp contributes to your HSA, that contribution isn’t a tax-free fringe either — it goes into Box 1 wages, and you deduct it on your 1040. Same loop, same net result, same reporting requirement.

Why September is the month to check

The fix for all of this is a payroll entry, and payroll entries only work while payroll is still running. The premium amount has to be in Box 1 before the year’s final payroll run and W-2s are produced. Two questions settle it: is the company paying the premiums (or reimbursing you for them), and is payroll set to add the annual total to Box 1?

If either answer is no, tell your payroll service to add an “S-corp owner health” pay item — every major payroll platform has one, usually as a one-time entry on the last run or an amount spread across remaining runs. If you paid premiums personally this year, have the company reimburse you before December 31 and report the reimbursement the same way. A December scramble works. A February discovery doesn’t — by then the W-2s are issued, payroll is closed, and the deduction is gone.

While you’re looking at payroll anyway

Check whether your W-2 salary itself is set at an IRS-defensible level.

Run your numbers

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Sources & References

Frequently asked

Questions owners actually ask

Do I pay extra payroll tax on this?: No. When the premiums are paid under a plan that covers employees generally, the Box 1 amount is exempt from Social Security, Medicare, and FUTA. Box 1 goes up; Boxes 3 and 5 don't. The company deducts the premiums as compensation, you deduct them above the line, and no payroll tax attaches anywhere. It's purely a reporting requirement.
What if I already paid this year's premiums personally?: Fixable, as long as the year is still open. Under Notice 2008-1, the S-corp can reimburse you for the premiums before year-end and report the reimbursement in Box 1 of your W-2. Write the reimbursement check from the company account, tell payroll to add the amount as S-corp owner health insurance, and the §162(l) deduction is preserved. What can't be fixed is a year that's already closed with the premiums never having touched the company or the W-2.
Does this apply to my spouse on the plan?: If your spouse is simply covered under your policy, the premiums are already yours and follow the rule above. If your spouse works for the S-corp, family attribution treats them as a >2% shareholder too — so premiums the company pays for their own coverage also go into Box 1 wages, not through a pre-tax fringe arrangement. The same attribution applies to your children, parents, and grandparents on the payroll.
My S-corp has other employees — does anything change?: The mechanics for your own premiums don't change: company pays or reimburses, amount lands in Box 1, you deduct under §162(l). What does matter is that the premiums be paid under a plan — and once non-owner employees are in the picture, health coverage arrangements can raise ACA and nondiscrimination questions that are beyond this article's scope. If you cover yourself but not your staff, that design deserves a careful look before you rely on it.
I'm on Medicare. Do my Medicare premiums count?: Yes. Medicare premiums for a >2% shareholder follow the same pattern: the S-corp pays them or reimburses you, the amount is reported in Box 1 of your W-2, and you deduct it above the line under §162(l). Paying them personally and skipping the reimburse-and-report step forfeits the deduction the same way it does for a marketplace or group policy.
Can I just run my premiums through the company's cafeteria plan pre-tax?: No. A >2% shareholder can't participate in the company's Section 125 cafeteria plan at all — no pre-tax premium withholding for you, even if your employees use it. Your premiums take the Box 1 route instead. The end result is similar (premiums deductible, no payroll tax), but the mechanism is entirely different, and mixing the two up is one of the more common payroll setup errors.

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Educational content only. This article is for informational purposes and does not constitute tax, legal, or financial advice. Every situation is different — consult a qualified professional before acting on anything here.