You hired someone in Wisconsin. Great news for your business. Less great news: the Wisconsin Department of Revenue, the Department of Workforce Development, a workers’ compensation insurer, and the IRS all want a piece of the action.
Wisconsin payroll isn’t the most complicated in the country, but it has a few quirks that catch employers off guard — a progressive income tax (not flat like Illinois), a workers’ comp requirement that kicks in earlier than most states, and a year-end reconciliation form that won’t file until your quarterly deposits are done. Learn these before your first payroll run, not after.
This guide covers every Wisconsin payroll tax obligation small business owners face in 2026: what to withhold, what you owe as the employer, when it’s due, and where to file it.
What Are the Wisconsin Payroll Tax Requirements for Small Businesses?
Wisconsin employers manage two layers of payroll compliance — state obligations through the Wisconsin Department of Revenue (DOR) and the Department of Workforce Development (DWD), and federal obligations through the IRS. Here’s the short version:
- Wisconsin income tax withholding: Progressive brackets from 3.50% to 7.65%. Use the Wisconsin WT-4 form and state withholding tables — the federal W-4 does not apply here.
- State unemployment insurance (SUI): Employer-paid. New employers pay 3.05% on the first $14,000 of each employee’s wages in 2026. Experience-rated employers range from 0% to 12.0%.
- Workers’ compensation insurance: Required once you have 3 or more employees, or pay $500 in wages in any calendar quarter. This is insurance, not a payroll tax — but it’s a legal obligation tied directly to payroll.
- FICA (Social Security + Medicare): Both you and your employee pay 6.2% for Social Security (up to $184,500) and 1.45% for Medicare. You match it dollar for dollar.
- Federal unemployment (FUTA): 6% on the first $7,000 per employee, reduced to an effective 0.6% if SUI is paid on time.
Wisconsin has no state disability insurance program and no paid family and medical leave tax as of 2026 — which simplifies things compared to some states. But the progressive income tax and the workers’ comp requirement add complexity that a flat-rate state doesn’t have.
Wisconsin State Income Tax Withholding: What Employers Must Know
The Rate: Progressive, Not Flat
Unlike Illinois, which taxes everyone at a flat 4.95%, Wisconsin uses four progressive brackets. The more your employee earns, the higher the marginal rate on income above each threshold. For 2026, rates range from 3.50% to 7.65%, based on the employee’s income and filing status.
You calculate withholding using the Wisconsin Department of Revenue’s withholding tables (Publication W-166). The tables account for filing status, pay frequency, and the number of allowances claimed on the employee’s WT-4. This takes a few extra steps compared to a flat-rate state, but the math is straightforward once you’ve done it once.
The Form: Wisconsin WT-4
Every new Wisconsin employee must complete a Form WT-4 before their first paycheck. This is Wisconsin’s version of the W-4 — but they are not interchangeable. The federal W-4 cannot be used for Wisconsin withholding purposes.
WT-4 captures the employee’s filing status and number of allowances. More allowances = less withheld. If an employee doesn’t submit one, withhold as if they claimed zero allowances.
How to Remit: Form WT-6
Withholding tax is reported and remitted using Form WT-6 (Withholding Deposit) through Wisconsin’s My Tax Account portal at tap.revenue.wi.gov. WT-6 returns are filed quarterly, due by the last day of the month following each quarter end:
- Q1 (Jan–Mar): April 30
- Q2 (Apr–Jun): July 31
- Q3 (Jul–Sep): October 31
- Q4 (Oct–Dec): January 31
Most small business employers deposit monthly through My Tax Account. If your withholding volume is higher, DOR may assign you a more frequent semi-monthly deposit schedule. Check your assigned schedule annually.
Year-End: Form WT-7 and W-2s
By January 31 of the following year, you must file Form WT-7 (Employer’s Annual Reconciliation) and submit all employee W-2s to the Wisconsin DOR through My Tax Account. Here’s the catch most employers miss: the WT-7 will not process until every WT-6 deposit report for the year has been filed. If even one quarterly deposit report is missing, your annual reconciliation bounces. File your WT-6s on time all year to avoid a January 31 scramble.
Wisconsin Income Tax Brackets at a Glance (2026)
The brackets below apply to wages subject to withholding. Exact withholding amounts depend on filing status and pay frequency — use Publication W-166 for the precise calculation.
| Wisconsin Tax Rate | General Income Range |
|---|---|
| 3.50% | Lowest income bracket |
| 4.40% | Second bracket |
| 5.30% | Third bracket |
| 7.65% | Highest bracket |
For specific dollar thresholds by filing status, refer to the current Wisconsin withholding tables in Wisconsin DOR Publication W-166. Brackets adjust annually.
Wisconsin Unemployment Insurance (SUI): What Employers Pay
State unemployment insurance is an employer-paid tax — your employees don’t contribute. It’s administered by the Wisconsin Department of Workforce Development (DWD) and funds benefits for workers who lose their jobs through no fault of their own.
2026 SUI Rates and Wage Base
| Employer Type | 2026 SUI Rate | Taxable Wage Base |
|---|---|---|
| New employer (payroll under $500K) | 3.05% | $14,000 per employee |
| New employer (payroll over $500K) | 3.25% | $14,000 per employee |
| New construction employer (under $500K) | 2.50% | $14,000 per employee |
| Established employer (experience-rated) | 0% – 12.0% | $14,000 per employee |
Wisconsin’s maximum SUI rate of 12.0% is higher than many states — worth keeping in mind if you’re in an industry with frequent turnover or seasonal layoffs. Your experience rate is calculated by DWD based on your claims history and typically assigned after your first three years in business.
When You Become Subject to SUI
Wisconsin requires SUI registration if you paid wages of $1,500 or more in any calendar quarter, or employed at least one person for some portion of a day in 20 different weeks during the year. Register through the DWD’s UI online portal at dwd.wisconsin.gov/ui before your first payroll.
Filing: DWD UI Online Portal
SUI contributions and quarterly wage reports are filed electronically through the DWD portal using Form UCT-101-E (Contribution Report) and Form UC-7823-E (Wage Report), filed together each quarter. Deadlines match the WT-6 schedule:
- Q1 (Jan–Mar): April 30
- Q2 (Apr–Jun): July 31
- Q3 (Jul–Sep): October 31
- Q4 (Oct–Dec): January 31
Workers’ Compensation: Wisconsin’s Earlier-Than-Expected Threshold
Workers’ compensation isn’t a payroll tax — it’s insurance you buy through a private carrier. But it’s triggered by payroll, it’s legally required, and the penalties for skipping it are severe enough that it belongs in any payroll compliance guide.
When It’s Required
Wisconsin requires workers’ comp coverage if you meet either of these conditions:
- You have 3 or more employees (full-time or part-time, family members included), or
- You have 1 or more employees and paid at least $500 in gross wages in any calendar quarter
That second condition is what catches people off guard. A single part-time hire who earns more than $500 in a quarter can trigger the requirement. Part-time employees count. Family members count. Corporate officers who work for the company generally count.
Who Is Exempt
Sole proprietors, partners, and LLC members are exempt from coverage but may choose to cover themselves voluntarily by endorsing their policy. Independent contractors may be exempt — but Wisconsin’s test for contractor status has nine strict criteria. If someone doesn’t meet all nine, DWD may classify them as an employee.
Penalties for No Coverage
Going without required workers’ comp coverage starts at $1,000 per day. DWD can issue stop-work orders, and injured workers can sue you directly — which they normally cannot do when coverage is in place. This is not an area to cut corners.
Federal Payroll Taxes: The Layer Underneath
Wisconsin state taxes don’t replace your federal obligations — they layer on top of them.
FICA: Social Security and Medicare
| Tax | Employee Rate | Employer Rate | 2026 Wage Cap |
|---|---|---|---|
| Social Security | 6.2% | 6.2% | $184,500 |
| Medicare | 1.45% | 1.45% | No cap |
| Additional Medicare* | 0.9% | None | Wages over $200,000 |
*You withhold Additional Medicare Tax from the employee once their wages exceed $200,000 in the calendar year. You do not match it.
FICA is reported on Form 941 quarterly and deposited through EFTPS on your assigned monthly or semi-weekly schedule.
Federal Unemployment (FUTA) and the SUI Connection
FUTA is 6% on the first $7,000 of each employee’s wages. Wisconsin employers who pay SUI on time receive a 5.4% federal credit, reducing the effective FUTA rate to 0.6% — or about $42 per employee per year. Let your DWD payments slip and you lose that credit. For a 10-person business, that’s $3,780 in extra federal taxes for no reason other than a missed deadline.
New Employee Setup: Wisconsin-Specific Requirements
Before running a new employee’s first paycheck, complete this checklist:
- Verify work authorization (Form I-9): Complete within 3 business days of hire. Keep on file — don’t mail it anywhere.
- Collect federal Form W-4: For federal income tax withholding.
- Collect Wisconsin Form WT-4: For Wisconsin income tax withholding. Cannot use the federal W-4 as a substitute. If not submitted, withhold at zero allowances.
- Report new hire to the state: Wisconsin requires reporting every new or rehired employee to the Wisconsin New Hire Reporting Center within 20 days of hire. Report online at newhire.dwd.wisconsin.gov.
- Confirm workers’ comp coverage: If this hire pushes you to 3+ employees, or if you’re paying $500+ in quarterly wages for the first time, coverage must be in place before the hire date.
- Register with DOR and DWD: If you haven’t already, register for Wisconsin withholding through My Tax Account and for SUI through the DWD UI portal before running any payroll.
Deposit Deadlines and the WT-7 Gotcha
Wisconsin has a wrinkle in its year-end process that catches employers off guard every January.
Quarterly WT-6 Deposits
Most small Wisconsin employers make monthly withholding deposits through My Tax Account, with quarterly WT-6 returns due April 30, July 31, October 31, and January 31. If your withholding volume is higher, DOR may assign a semi-monthly deposit schedule.
The WT-7 Rule
Form WT-7 (the annual reconciliation, due January 31) will not process if any WT-6 deposit report for the year is missing or unfiled. You’ll receive a rejection or error message, and the WT-7 will remain in limbo until every quarterly deposit report is submitted. The fix is simple: file every WT-6 on time throughout the year. But if you inherit a payroll situation mid-year or have a gap in filings, clean it up before January 31 or the year-end process stalls.
Federal EFTPS Deposit Schedule
Federal deposits follow the same logic as every state. Your schedule is determined by your lookback period (total Form 941 liability for the four quarters ending June 30 of the prior year):
- $50,000 or less: Monthly depositor — due by the 15th of the following month.
- More than $50,000: Semi-weekly depositor — due within 3–5 business days of payroll.
- $100,000 next-day rule: Accumulate $100,000 in a single day, deposit the next business day regardless of your normal schedule.
Penalties for Getting It Wrong
Federal Failure-to-Deposit Penalties
- 1–5 days late: 2%
- 6–15 days late: 5%
- 16+ days late: 10%
- After IRS notice: 15%
Trust Fund Recovery Penalty
If federal payroll taxes go unpaid and the IRS determines the failure was willful, they can assess the Trust Fund Recovery Penalty against any “responsible person” — owner, officer, or anyone with authority over company funds. This is a personal liability. The entity structure doesn’t shield you. Wisconsin employers are not exempt from this federal enforcement mechanism.
Wisconsin State Penalties
The Wisconsin DOR charges a failure-to-file penalty and a separate failure-to-pay penalty on late withholding tax. DWD charges interest on late SUI contributions. And as noted above, operating without required workers’ comp coverage starts at $1,000 per day — with stop-work orders and direct civil liability layered on top.
What This Means for Your Wisconsin Business
Here’s the plain-English version for a Wisconsin small business owner setting up payroll for the first time — or trying to clean something up:
- Don’t use the federal W-4 for Wisconsin withholding. Employees need to complete a Wisconsin WT-4. It’s a different form with different allowance calculations. Using the wrong form means you’re withholding the wrong amount.
- Get your workers’ comp coverage sorted before you hire. The $500-in-a-quarter threshold arrives faster than most employers expect. Have a policy in place before it applies — not after an incident.
- File every WT-6 on time. The January 31 WT-7 reconciliation depends on it. One missing quarterly deposit report and your year-end process stalls.
- Pay SUI on time to protect your FUTA credit. Same principle as Illinois — let DWD payments slip and you pay $378 more per employee in federal taxes. That’s real money with no upside.
- Register with three portals before you run your first check: My Tax Account (DOR), DWD UI online portal, and EFTPS. None of them talk to each other. Each has its own schedule and login.
Payroll Freedom Handles This for Wisconsin Small Businesses
Payroll Freedom operates out of Grafton, WI and serves small businesses across Wisconsin and Illinois. We handle state and federal payroll tax withholding, SUI filings, W-2s, and the year-end WT-7 reconciliation — so you’re not managing three government portals and a workers’ comp audit calendar on top of running your business.
If you want to know what professional payroll actually costs, read our guide on payroll service pricing for small businesses. Or reach out to Payroll Freedom directly at mypayrollfreedom.com or call our Grafton office at 262-375-2440.
Also running payroll in Illinois? Read our Illinois payroll tax requirements guide here.
This article is provided for general informational purposes only and does not constitute tax, legal, accounting, or financial advice. Payroll tax rates, wage bases, and filing requirements are subject to change and vary by employer. Every business situation is different. Before acting on anything you read here, please consult with a qualified advisor — including, we hope, us. Reach out to Payroll Freedom for guidance specific to your Wisconsin business. Frank Fiore is the Visionary behind Accounting Freedom and Payroll Freedom, serving small businesses in Illinois and Wisconsin since 1981. Payroll Freedom’s Grafton, WI office has been helping Wisconsin employers navigate state payroll compliance for decades — from DWD registration to workers’ comp thresholds to the annual WT-7 reconciliation. Reach us at our Wisconsin office at 262-375-2440.
