Short answer: if you own more than 2% of an S corporation in Wisconsin, the company pays or reimburses your health insurance premiums and puts them in Box 1 of your W-2 as wages, but not in the Social Security and Medicare boxes. You then take them back off your income as the self-employed health insurance deduction, on Form 7206 and Schedule 1, line 17. Wisconsin starts from federal adjusted gross income, so the deduction also lowers your state tax: 5.3% of it on single-filer taxable income from $51,950 to $332,720 in 2026. (Reviewed November 2026 by Daniel Griffin, licensed independent advisor, NPN #22052447. Not tax advice; confirm with your tax preparer.)
- $8,824a year of the lowest-cost Silver plan for a 40-year-old in the typical Wisconsin county, 2027
- $1,350of Social Security and Medicare tax a Wisconsin owner skips on it, against the same amount paid as salary under $192,300
- Box 1where those premiums land on your W-2; Boxes 3 and 5 stay clear of them
- 5.3%Wisconsin’s 2026 rate on single-filer taxable income from $51,950 to $332,720
How the Money Moves in Wisconsin
- Buy the planAny of the 12 insurers on the Wisconsin marketplace, or a private plan, in your name or the company’s.
- The S corp pays$747 a month for a 40-year-old’s cheapest 2027 Silver plan in Milwaukee, paid or reimbursed by the company.
- Payroll adds it$8,963 a year goes into W-2 Box 1 wages, not Boxes 3 and 5.
- Form 7206The deduction is worked out there, capped at your Medicare wages.
- Schedule 1Line 17: the $8,963 comes back off your income.
A more-than-2% shareholder is treated like a partner for fringe benefits, so the premiums cannot be a tax-free benefit the way they are for staff. IRS Notice 2008-1 is the route around that: wages for income tax, left out of Social Security and Medicare wages, then deducted under section 162(l).
Paying the premiums from your personal account and never running them through the company. The IRS’s own example in Notice 2008-1 is a shareholder who pays for a policy in their own name with no reimbursement: no plan established by the S corporation, no deduction.
In Milwaukee that mistake costs the whole $8,963 and roughly $2,151 of federal income tax at 24%. The fix has a deadline: the company pays or reimburses the premiums by December 31 and adds them to your W-2. The year-end checklist has every date in order.
Work out your deduction
Form 7206-style worksheet. An estimate, not a tax return.Presets: the typical lowest-cost Wisconsin Silver plan for 2027. Line 10: Social Security tax to the $192,300 wage base, Medicare 2.9%, plus 0.9% over $200,000. Nothing you type leaves this page until you send it.
The Cap Most Owners Miss
The deduction cannot be more than your earned income from the S corporation, which for a more-than-2% shareholder means wages as defined for Social Security and Medicare tax (section 162(l)(5)), Box 5 of the W-2. The premiums are in Box 1 but not Box 5, so they never raise the cap, and an owner who takes no salary gets no deduction at all. For the Milwaukee plan above, a salary of $8,963 or more keeps every dollar deductible.
Three More Rules
- The spouse ruleNo deduction for any month you could join a subsidized employer plan, yours or your spouse’s, even if you did not enroll.
- Family countsYour spouse, dependents and any child under 27 at year end are covered; a Wisconsin family of four’s typical lowest-cost Silver plan is $2,351 a month, $28,211 a year to deduct. A spouse, child, grandchild or parent of the owner counts as a 2% shareholder too.
- Marketplace creditOnly the premium you pay after any premium tax credit is deductible. Above $63,840 of income for one person there is no 2027 credit, so the full premium counts.
What It Is Worth in Wisconsin for 2027
| Household | Per month | Deductible per year | Federal tax saved at 22% | At 24% | Plus Wisconsin tax at 5.3% |
|---|---|---|---|---|---|
| One adult, 40 | $735 | $8,824 | $1,941 | $2,118 | $468 |
| Two adults, 40, and two children | $2,351 | $28,211 | $6,206 | $6,771 | $1,495 |
Wisconsin starts from federal adjusted gross income and taxes it at graduated rates for 2026: 3.5%, 4.4%, 5.3%, and 7.65% above $332,720 of taxable income for a single filer ($443,630 married filing jointly). The marketplace in Wisconsin has 12 insurers for 2027, a median of 28 plan options per county, and a PPO in 15 of its 72 counties. Above $63,840 of household income for one person ($132,000 for a family of four) there is no premium tax credit, so the deduction carries the full saving.
What It Saves Across Wisconsin
| Where | Lowest Silver, per month | Deductible per year | Federal tax saved at 24% | Payroll tax not charged | Wisconsin tax saved at 5.3% |
|---|---|---|---|---|---|
| Milwaukee (Milwaukee County) | $747 | $8,963 | $2,151 | $1,371 | $475 |
| Madison (Dane County) | $641 | $7,693 | $1,846 | $1,177 | $408 |
| Waukesha (Waukesha County) | $685 | $8,217 | $1,972 | $1,257 | $436 |
| Green Bay (Brown County) | $717 | $8,609 | $2,066 | $1,317 | $456 |
| Racine (Racine County) | $726 | $8,708 | $2,090 | $1,332 | $462 |
Want a PPO? In Green Bay the cheapest Silver PPO for a 40-year-old is $757 a month, against $717 for the cheapest Silver plan of any kind. The extra $480 a year is deductible too, which at 24% trims it to about $365.
Wisconsin’s 2026 Brackets
Wisconsin taxes 2026 income at 3.5% up to $15,110 of taxable income for a single filer, 4.4% to $51,950, 5.3% to $332,720 and 7.65% above that; for married couples filing jointly the steps are $20,150, $69,260 and $443,630. At 5.3%, a year of the typical lowest-cost Silver plan, $8,824, saves $468 in Wisconsin tax.
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Sole proprietor, partner or C corporation owner instead? The rules differ: see the self-employed health insurance deduction in Wisconsin and how each kind of business handles owner health insurance. With staff in Wisconsin, see S corp owners in Wisconsin and ICHRA for small businesses.
Before the year closes: the year-end checklist, every date in order. Tax professionals with Wisconsin clients: a printable one-page Wisconsin handout.
Common Questions
Can an S corp owner deduct health insurance in Wisconsin?
Yes, if you own more than 2% and the S corporation pays or reimburses the premiums and reports them in Box 1 of your W-2. You deduct them on Form 7206 and Schedule 1, line 17. Wisconsin starts from federal adjusted gross income, so the deduction also lowers your state tax: 5.3% of it on single-filer taxable income from $51,950 to $332,720 in 2026.
What if I paid the premiums from my personal account?
Have the S corporation reimburse you and add the amount to your W-2 before it is issued. A policy you pay yourself with no payment or reimbursement by the company gets no deduction; in Milwaukee that is $8,963 a year on the cheapest Silver plan for a 40-year-old.
How much Wisconsin tax does the S corp health insurance deduction save?
It comes off federal adjusted gross income, where Wisconsin starts, so it saves your top Wisconsin rate on it: 5.3% for single-filer taxable income from $51,950 to $332,720 in 2026, 7.65% above that.
Sources
- IRS, Instructions for Form 7206 (2025)
- IRS, Notice 2008-1 (2-percent S corporation shareholders)
- 26 U.S. Code section 162(l)
- IRS, Publication 974 (premium tax credit)
- Wisconsin Department of Revenue, 2026 Form 1-ES instructions (tax rate schedules)
- CMS, Plan Year 2027 Qualified Health Plan Landscape file
- HHS, 2026 poverty guidelines (2027 coverage)
- Social Security Administration, 2027 fact sheet (wage base)
- Wisconsin Department of Revenue, 2025 Schedule SB instructions (line 6, medical care insurance)