Wisconsin Bonus Tax Calculator
Data compiled and maintained by Edmond Daher · Updated 2026-06-16
That big bite out of a Wisconsin bonus is withholding at work — a prepayment, not a special bonus tax. Wisconsin uses a graduated state rate (3.54%–7.65% by income) on top of the 22% federal prepayment and FICA. Enter your numbers to see what's held back now beside what the bonus will really cost when you file, and your refund or amount owed. Everything runs in your browser.
The quick take: a stand-alone Wisconsin bonus has a flat 22% federal tax withheld, a graduated Wisconsin rate (3.54%–7.65%) by income, plus 7.65% FICA. But that's only withholding. Your real bill is your marginal rate at filing; run the calculator to see the refund or shortfall.
Estimate only, not tax advice — terms.
Wisconsin bonus withholding, piece by piece
Federal: a flat 22% prepayment. Paid on its own check, a bonus has federal income tax withheld at a flat 22% (IRS Publication 15). Bonus dollars over $1,000,000 in the year switch to a mandatory 37%; below that it's a flat 22% prepayment tied to the third bracket.
Wisconsin: a graduated rate. Wisconsin sets the supplemental rate by annual gross wages — 3.54% under $12,760, 4.65% to $25,520, 5.30% to $280,950, and 7.65% above that (Wisconsin DOR Publication W-166).
Don't expect FICA back. Of the total held back, 7.65% is FICA — Social Security to the wage base, plus Medicare — owed at that rate. The income-tax withholding is the only part that can come back — the FICA share is settled the moment it's taken.
For your regular salary rather than a bonus, use the Wisconsin paycheck calculator.
What Wisconsin holds back on a $5,000, $25,000, or $100,000 bonus
What's held back from three bonus sizes in Wisconsin (single filer, $70,000 salary):
| Bonus | Federal | Wisconsin | FICA | Total | % of bonus |
|---|---|---|---|---|---|
| $5,000 | $1,100 | $265 | $383 | $1,748 | 34.9% |
| $25,000 | $5,500 | $1,325 | $1,913 | $8,738 | 34.9% |
| $100,000 | $22,000 | $5,300 | $7,650 | $34,950 | 34.9% |
The rate drifts as Social Security hits its annual cap, but the income-tax part still reconciles at filing.
$61,000 salary, $9,000 bonus: the Wisconsin withholding-vs.-tax breakdown
Here's how a $9,000 bonus plays out for a single filer making $61,000 in Wisconsin:
- Off the top: $3,146 disappears at payday — $1,980 federal, $477 Wisconsin, and $689 FICA — so roughly $5,855 actually reaches you, a 34.9% cut.
- What it actually costs: the true income tax on the bonus is about $1,907 (federal $1,430 + Wisconsin $477), plus the same $689 FICA.
- The gap: you over-paid income tax by roughly $550, and that returns as a refund at filing. FICA ($689) stays either way — it's a real tax.
Example single-filer numbers from the calculator above; your own refund or bill shifts with your total income and filing status.
Why your Wisconsin bonus looks over-taxed — and mostly isn't
Bonuses aren't taxed differently — only withheld differently. The real tax is your ordinary marginal rate, settled on your return, not the flat 22% on the check. When 22% overshoots your rate you're refunded; when it undershoots, the balance is due. In this page's $9,000 example, about $550 of what's withheld is really over-payment you'd get back. The one piece that never refunds is FICA (7.65%) — a genuine tax, not a prepayment.
Bonus withholding in Wisconsin next to Minnesota, Illinois and Michigan
Here's a $10,000 bonus on a $70,000 salary compared across Wisconsin and nearby Minnesota, Illinois and Michigan:
| State | Bonus method | State withheld | Total withheld |
|---|---|---|---|
| Wisconsin | graduated 3.54–7.65% | $530 | $3,495 |
| Minnesota | flat 6.25% | $625 | $3,590 |
| Illinois | aggregate (~4.95%) | $495 | $3,460 |
| Michigan | aggregate (~4.25%) | $425 | $3,390 |
Total combines the 22% federal, the state line, and FICA. Single-filer estimates — your real income tax settles when you file.
Wisconsin bonus tax FAQ
Does Wisconsin tax bonuses more than regular pay?
No. There's no separate, higher tax on bonuses — a bonus is just withheld at a flat rate up front, then taxed like any income at your marginal rate.
How does Wisconsin's graduated bonus rate work?
Wisconsin picks the rate from your annual gross wages: 3.54% under $12,760, 4.65% to $25,520, 5.30% to $280,950, and 7.65% above that.
Will I get some of my Wisconsin bonus withholding back?
Often, yes — if your true marginal rate is below the 22% withheld, the difference refunds at filing; above 22%, you owe it. FICA is a true tax and never refunds.
What is the Wisconsin bonus tax rate in 2026?
Wisconsin withholds 3.54%–7.65% by income band on a separately paid bonus, on top of the flat 22% federal rate (37% above $1,000,000/yr) and 7.65% FICA. That's withholding, not your final tax.
Bonus tax calculators near Wisconsin
Wisconsin paycheck calculator · all state bonus tax calculators →
Sources
- IRS Publication 15 (2026) — Supplemental Wages (flat 22% / 37% above $1M)
- Wisconsin supplemental rate: Wisconsin DOR Publication W-166 (2026): four-band graduated supplemental rate (all bands + thresholds verified verbatim)