Wisconsin Bonus Tax Calculator 2026
Wisconsin withholds a flat 3.54% to 7.65%, depending on salary, for state income tax on bonuses, on top of the 22% federal supplemental rate, Social Security and Medicare. See your net bonus, what gets withheld, and how much of it may come back when you file.
Reviewed by Slava Akulov, CEO & Co-Founder at Jupid · Last updated: October 2026
About $78,000 a year before the bonus
Capped at the 2026 limit of $24,500. Leave at 0% if your plan does not take deferrals from bonuses.
Net bonus (cash in your account)
$6,505
from a $10,000 bonus in Wisconsin, 2026
Total withheld
$3,495
Share of the bonus withheld
34.9%
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Withholding Breakdown
Flat 22% supplemental rate
Flat 5.3% for your salary
Withheld vs what you may actually owe
Assumes your regular pay is your only income and you take the standard deduction. Social Security, Medicare and state payroll taxes are final and do not change at filing.
Flat Rate vs Aggregate Method
Your employer picks the method. The aggregate method adds the bonus to one regular paycheck and withholds as if you earned that much every pay period.
| Withheld | Flat rate | Aggregate |
|---|---|---|
| Federal income tax | $2,200 | $2,812 |
| WI income tax | $530 | $535 |
| Net bonus | $6,505 | $5,889 |
How Wisconsin Withholds Tax on Bonuses in 2026
WI bonus withholding
3.54% to 7.65%
Federal flat rate
22%
Federal, above $1M
37%
Social Security + Medicare
7.65%
Wisconsin allows approved flat percentages on supplemental pay, based on your estimated annual salary: 3.54% under $12,760, 4.65% under $25,520, 5.30% under $280,950 and 7.65% at $280,950 and above. Employers may instead add the bonus to regular wages.
Source: Wisconsin DOR, Publication W-166 Withholding Tax Guide (1/26), checked October 30, 2026.
Is a Bonus Taxed Higher in Wisconsin?
No. A bonus is ordinary wage income. It only looks heavily taxed because the employer withholds at flat rates instead of your personal rate. When you file your 2026 return, the bonus is added to your salary and taxed at the same federal brackets and Wisconsin rates as the rest of your pay.
The federal 22% is a good fit for people in the 22% bracket. If your income keeps you in the 10% or 12% bracket, the flat rate over-withholds and the extra comes back as a refund. If the bonus pushes you into the 24%, 32% or higher bracket, 22% is too little and you will owe the difference in April. The calculator compares both numbers for your salary.
Social Security and Medicare work differently: they are a flat 7.65% on wages and are not settled at filing. The one exception is Social Security on wages above $184,500 in 2026. Once your salary plus bonus passes that cap, the 6.2% stops. If two employers both withheld it, you claim the excess back on your return.
Bonus Withholding in States Near Wisconsin
| State | 2026 bonus withholding | Calculator |
|---|---|---|
| Wisconsin | Flat 3.54% to 7.65% by annual salary (optional) | This page |
| Illinois | Flat 4.95% (optional) | Illinois bonus tax |
| Iowa | Flat 3.8% (optional) | Iowa bonus tax |
| Michigan | Flat 4.25% | Michigan bonus tax |
| Minnesota | Flat 6.25% | Minnesota bonus tax |
Wisconsin Bonus Tax FAQ
More Pay Tools for Wisconsin
Wisconsin Paycheck Calculator
Take-home pay on your regular salary, per paycheck.
Wisconsin Hourly Paycheck Calculator
Hourly pay with overtime, after federal and state taxes.
Wisconsin Tax Withholding Calculator
Check whether your W-4 withholding covers the bonus year.
Commission Calculator
Work out commission pay, which is withheld like a bonus.
Bonus Tax Calculators for Other States
State withholding on a bonus runs from 0% in the nine states without a wage income tax to more than 10%. Pick a state to see its 2026 rule.
Official References
- IRS Publication 15 (2026), Employer's Tax Guide
Section 7: 22% flat rate on supplemental wages, 37% above $1 million
- Wisconsin DOR, Publication W-166 Withholding Tax Guide (1/26)
Wisconsin rule for withholding on supplemental wages
- IRS IR-2025-111: 2026 401(k) limit
$24,500 employee deferral limit for 2026
Estimates only. Federal aggregate withholding and the tax you may owe are approximated with the 2026 brackets and standard deduction; Wisconsin amounts use the state rates in our paycheck calculator. Local taxes, credits, other income and employer-specific payroll setups are not included. Consult a tax professional for advice on your situation.
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