In Wisconsin, most workers see roughly 20% to 35% of their gross pay withheld for taxes each pay period. That total is a mix of four things: federal income tax, Wisconsin state income tax, Social Security, and Medicare. Employers are required by state law to withhold both federal and state income taxes from your wages, so the money flows to the IRS and the Wisconsin Department of Revenue throughout the year instead of arriving as one bill in April.1Wisconsin State Legislature. Wisconsin Code 71 – Income and Franchise Taxes for State and Local Revenues – Section: 71.64 Employers Required to Withhold Where you land inside that 20–35% range depends on your earnings, filing status, and any pre-tax benefits you take.
Social Security and Medicare
Two federal payroll taxes come out of every paycheck at flat rates. Social Security takes 6.2% of your gross wages up to an annual wage base, which is $184,500 for 2026. Once your year-to-date earnings hit that cap, Social Security withholding stops for the rest of the year, with a maximum annual tax of about $11,439.2Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates3Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet
Medicare takes 1.45% of all your wages with no cap.4Social Security Administration. Contribution and Benefit Base If your wages pass $200,000 in a calendar year, your employer must withhold an additional 0.9% Medicare tax on every dollar above that line, bringing the combined Medicare rate to 2.35% on the excess. The $200,000 trigger applies regardless of filing status, but the liability thresholds when you file are $250,000 for married filing jointly and $125,000 for married filing separately, so any mismatch gets settled on your return.5Internal Revenue Service. Topic No. 560, Additional Medicare Tax
Together, Social Security and Medicare account for 7.65% of most paychecks. That piece is predictable. The rest depends on the income tax rules below.
Federal Income Tax
The federal system is progressive: only the income within each bracket is taxed at that bracket’s rate, so your whole paycheck is never taxed at the top rate you reach. For 2026, single filers face seven brackets:6Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
- 10% on taxable income up to $12,400
- 12% on $12,401 to $50,400
- 22% on $50,401 to $105,700
- 24% on $105,701 to $201,775
- 32% on $201,776 to $256,225
- 35% on $256,226 to $640,600
- 37% on income over $640,600
For married couples filing jointly, each threshold is roughly double the single amount. The 10% bracket runs to $24,800, the 12% bracket extends to $100,800, and 37% starts above $768,700.6Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
Before the brackets apply, your employer subtracts the standard deduction to estimate taxable income. For 2026, the federal standard deduction is $16,100 for single filers, $32,200 for married filing jointly, and $24,150 for head of household. What your employer actually withholds each period is driven by the W-4 on file: filing status, dependents, and any extra withholding you asked for.
Wisconsin State Income Tax
Wisconsin has its own progressive income tax with four brackets. For tax years beginning after December 31, 2024, single filers and heads of household pay:7Wisconsin State Legislature. Wisconsin Statutes 71.06 – Rates of Taxation
- 3.50% on taxable income from $0 to $14,680
- 4.40% on $14,681 to $50,480
- 5.30% on $50,481 to $323,290
- 7.65% on income over $323,290
The math works the same way as federal brackets. A single filer with $60,000 in taxable income pays 3.50% on the first $14,680, 4.40% on the next $35,800, and 5.30% only on the portion above $50,480. Married couples filing jointly get wider bands, so the same household income usually lands at a lower effective state rate.
Wisconsin also has its own standard deduction that phases down as income rises, eventually reaching zero for higher earners. Two workers with the same filing status but different salaries can end up with different Wisconsin deductions because of this sliding scale.
One thing you won’t see on a Wisconsin pay stub: local income tax. State law bars cities and counties from imposing their own income taxes, so nothing gets added on top for where you live or work inside the state.
Pre-Tax Deductions That Shrink the Bite
Some paycheck deductions come out before taxes are calculated, so every dollar you contribute lowers the wages subject to federal, state, and (for most) FICA withholding. The common ones:
- 401(k) or 403(b) contributions, capped at $24,500 in 2026. Workers 50 and older can add a catch-up of up to $8,000 for a total of $32,500, and workers ages 60 through 63 get a higher catch-up limit of $11,250.8Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
- Health Savings Account contributions if you have a high-deductible health plan. The 2026 limits are $4,400 for self-only coverage and $8,750 for family coverage.9Internal Revenue Service. Notice 2026-05 – 2026 HSA Contribution Limits
- Employer-sponsored health, dental, and vision premiums paid through payroll.
- Flexible Spending Account contributions for healthcare or dependent care.
If a deduction on your pay stub isn’t clearly labeled pre-tax or post-tax, your HR department or benefits portal can confirm. Roth 401(k) contributions, union dues, and wage garnishments come out after taxes, so they don’t reduce withholding.
Why Bonus Checks Look Different
Bonuses, commissions, overtime, and severance count as supplemental wages. The IRS lets employers withhold federal tax on those payments at a flat 22%, which is why a bonus check often looks smaller than a regular check of the same size. If your supplemental pay from a single employer tops $1 million in a year, the excess is withheld at 37%.
Wisconsin doesn’t use a single flat rate for supplemental wages. The state applies a graduated scale tied to your annual salary, running from 3.54% at the low end to 7.65% at the top, mirroring the regular bracket structure.
If You Commute Across State Lines
Wisconsin has reciprocity agreements with Illinois, Indiana, Kentucky, and Michigan. If you live in Wisconsin and work in one of those states, or the reverse, only your home state taxes your wages.10Wisconsin Department of Revenue. Publication 121 – Reciprocity A Wisconsin resident working in Illinois has Wisconsin tax withheld, not Illinois tax, and files only a Wisconsin return for that income. To get the right state’s tax withheld, you generally have to file an exemption form with your employer.
Adjusting What Gets Withheld
Two forms drive your withholding: the federal W-4 and the Wisconsin WT-4. The WT-4 is available on the Wisconsin Department of Revenue’s website and covers filing status and exemptions for state purposes.11Wisconsin Department of Revenue. DOR Withholding Tax Forms If you never submit a WT-4, your employer defaults to withholding at the single rate with zero exemptions, which typically pulls more tax than you actually owe.
If you consistently owe a large balance at tax time or get back a large refund, that’s a signal to update the W-4 or WT-4. Lowering or raising your elections moves the amount withheld each period closer to your real annual liability, so your paycheck reflects what you actually owe rather than a rough estimate.