Payroll Wisconsin: Employer Tax and Software Guide

I build HR software for small businesses, and in every state I look at, I start with one question: what stands between a new hire and a correct first paycheck? This guide answers it for Wisconsin, covering what the state requires, what changed for 2026, and how 10 payroll providers price the work.

Wisconsin is administratively one of the easier states to run payroll in, and the reasons are mostly about what is absent rather than what is present. There is no local income tax in any city, village, town, or county, which spares you the address-by-address local tax lookups that make payroll error-prone in Ohio, Pennsylvania, and Alabama.

There is also no state disability insurance program and no paid family leave contribution. The unemployment system sits on its lowest rate schedule for 2026, and the pay frequency rule is loose enough that monthly payroll is legal, something neighboring Illinois allows only for executive, administrative, and professional staff.

What Wisconsin does have is a graduated income tax with four brackets, a state withholding form that exists alongside the federal one, reciprocity agreements with four states, which matter enormously along the Illinois border, and a workers compensation trigger that catches employers with a single part-time worker.

What Wisconsin requires from employers

State income tax withholding

Wisconsin taxes income in four graduated brackets, but paycheck withholding follows a separate state formula with its own rates. The Department of Revenue publishes the bracket range as 3.50 percent to 7.65 percent, and for tax year 2026 the top rate applies to taxable income above $332,720 for single filers and $443,630 for married filing jointly.

Wisconsin Act 15, signed by Governor Evers on July 3, 2025, expanded the 4.40 percent bracket from tax year 2025, so a larger slice of middle income is taxed at that rate rather than at 5.30 percent. For an employer, the change is invisible on payday, because the withholding formula did not change with it.

That separate formula is set out in the department's Publication W-166. Revised in January 2026, it still computes paycheck withholding at 3.54, 4.65, 5.30, and 7.65 percent. It is the formula in force for withholding periods beginning on or after January 1, 2022, so employees see the lower return rates when they file their annual return.

Wisconsin also applies a sliding-scale standard deduction that phases out as income rises, which is unusual and is handled inside the withholding tables rather than by the employer.

Depositing and reporting Wisconsin withholding

How often you remit Wisconsin withholding depends on a frequency the Department of Revenue assigns rather than on your pay schedule. Deposits are reported on Form WT-6.

The department sets that frequency from the information on your registration and can change it from January 1 when your withholding liability changes. A growing payroll can therefore move to a more frequent schedule without anything else about the business changing.

Every employer with a Wisconsin withholding account closes the year on Form WT-7 by January 31, or within 30 days of the cease date if the account is closed earlier. A self-service payroll tier, where you file the taxes yourself, hands that whole cycle back to you, along with the quarterly unemployment reports described next.

Unemployment insurance

Unemployment insurance is the second state payroll tax, and Wisconsin employers fund it entirely, at the rates and on the wage base below.

Under Wisconsin Statute 108.18, Schedule D applies whenever the reserve fund held at least $1.2 billion on the preceding June 30. The Department of Workforce Development lists it for 2024, 2025, and 2026, a sign of a healthy trust fund. New construction employers pay less for 2026: 2.50 percent under $500,000 of payroll, down from 2.90 percent.

The $14,000 wage base is higher than Ohio's $9,000 or Arizona's $8,000, according to the Department of Labor's 2026 summary of state unemployment laws, so unemployment cost per employee runs higher at the top of the range. On the other hand, employers with clean claims histories can reach a rate of zero, which not every state permits.

Form WT-4 and the reciprocity question

Two withholding forms

Every newly hired Wisconsin employee completes both the federal W-4 and Form WT-4, the Employee's Wisconsin Withholding Exemption Certificate. The requirement dates from January 1, 2020, when the redesigned federal W-4 dropped withholding allowances. The Department of Revenue does not accept the federal form for Wisconsin withholding, because the Wisconsin formula still relies on the exemptions each employee lists on the state certificate.

WT-4 also does a job the federal form does not. It carries an employer section and the hire date, and the department lets employers use it to meet Wisconsin's new hire reporting requirement.

Reciprocity with four states

Wisconsin has income tax reciprocity agreements with Illinois, Indiana, Kentucky, and Michigan. A resident of any of those states who works in Wisconsin and gives the employer Form W-220 is not subject to Wisconsin withholding and is taxed by their home state instead. The reverse holds for Wisconsin residents working in those states.

The last two rows are the trap. Wisconsin borders four states, and its agreements cover only two of them, Illinois and Michigan. Minnesota and Iowa are not covered, so an employee commuting from either is subject to ordinary Wisconsin withholding. In the Twin Cities metro, where the Minnesota border lies within commuting distance of Hudson and River Falls, that distinction is a live operational question rather than a technicality.

Wage rules and the workers comp triggers

Minimum wage and the opportunity rate

Wisconsin's minimum wage is $7.25, matching the federal floor and unchanged since July 2009. The Department of Labor's state minimum wage table lists Wisconsin among 13 states whose rate equals the federal $7.25, so there is no higher-rate calculation to perform.

According to the Department of Workforce Development, the opportunity wage ends at 90 consecutive days or on the employee's twentieth birthday, whichever comes first. That gives it a date that has to be tracked per employee rather than set once.

Local governments cannot set higher minimum wages. Wisconsin Statute 104.001 bars any city, village, town, or county minimum wage ordinance, so there is no city-level variation like Arizona's, where Flagstaff and Tucson set their own rates.

Pay frequency and final pay

Wisconsin Statute 109.03 requires that no more than 31 days pass between pay periods, so monthly payroll is legal in Wisconsin. That is permissive by regional standards. Termination runs on a separate clock: under Wisconsin Statute 109.03(2), an employee who quits or is discharged must be paid in full by the next regular payday, or by the earlier date the 31-day rule sets, unless the employee is a commission sales agent or has a written contract for a definite period. Several other states require final pay within days of a discharge.

Illinois and Indiana are stricter on pay frequency. The Department of Labor's state payday table shows both requiring pay at least twice a month for most employees, with monthly pay allowed in Illinois only for executive, administrative, and professional staff.

Workers compensation has two triggers

Wisconsin applies two separate workers compensation coverage tests, both listed by the Department of Workforce Development. The requirement is easy for small employers to miss, because the headline threshold is not the only one.

Either trigger creates the obligation independently. The second one is what catches a two-person operation: $500 in combined gross wages in a single quarter is a very low bar, reachable by one part-time employee working a handful of weeks. An employer who checked the three-employee rule and concluded they were exempt may still be covered by the wage test.

10 payroll providers for Wisconsin employers compared

Every provider below files Wisconsin state withholding and unemployment insurance. Because there is no local tax layer and no state disability or paid leave program, the differentiators here are narrow: whether the platform files the quarterly UCT-101 including for zero-rated employers, how it handles the four reciprocity states, and what an employee across a state line costs.

OnPay

OnPay sells one payroll plan at $49 per month plus $6 per employee, with HR tools and time tracking offered as paid add-ons rather than tiers to climb. Tax filing covers all 50 states with no multi-state surcharge, and year-end W-2 and 1099 filing sits in the base price.

Gusto

Gusto is a common first payroll purchase for US small businesses, with automatic tax filing, published pricing, and onboarding built into the same account. Simple runs $49 per month plus $6 per employee after a base increase from $40 during 2025.

The single-state limit on Simple is sharper in Wisconsin than the headline suggests. The state borders four others, two with reciprocity and two without, and the Illinois and Minnesota corridors both carry meaningful commuter traffic. One employee working across either line moves you to Plus at $80 plus $12 per employee.

Patriot Software

Patriot Full Service is the lowest-cost published plan in this comparison at every modeled headcount: $37 per month plus $5 per employee, covering federal, state, and local tax filing, though new hire reporting stays with you. Basic is $17 plus $4 if you file taxes yourself, which in Wisconsin means handling the quarterly UCT-101 and the withholding deposits by hand.

Square Payroll

At $35 per month plus $6 per person paid, Square Payroll's full-service plan covers state tax filing, new hire reports, and multi-state payroll with no surcharge. For a Milwaukee or Madison restaurant already running Square point of sale, timecard data flows straight into payroll, which also makes the 90-day opportunity wage window easier to track.

SurePayroll

SurePayroll is owned by Paychex and built for very small employers and household employers. Its Small Business plan is $29 per month plus $7 per employee, with a flat $9.99 monthly multi-state fee rather than a per-state charge, which suits a Wisconsin employer with one person over the Illinois or Minnesota line.

QuickBooks Workforce Payroll

Workforce Payroll, formerly Payroll Core, costs $50 per month plus $7 per employee after the per-employee fee rose on July 1, 2026, and that rise does not change the argument for it. If your books live in QuickBooks Online, payroll reaches the general ledger without an export.

ADP RUN

ADP says every RUN package calculates, files, deposits, and reconciles payroll taxes and handles inquiries from taxing agencies, and that it pays the resulting fines or penalties if it makes a tax filing error. In Wisconsin, that is worth most to employers with staff across the reciprocity lines.

The cost is opacity. ADP does not publish RUN pricing: the Essential, Enhanced, Complete, and HR Pro packages are all quoted individually. ADP also says no contract is required and services can be terminated at any time.

Paychex Flex

Paychex competes on service rather than software, with a payroll specialist included on its top Complete package. Every payroll package (Basic, Foundations, Advanced, and Complete) is priced on request, so the service model has to be costed through a sales conversation.

Paylocity

Paylocity sits between small-business payroll and full human capital management (HCM) software, aimed at companies that have outgrown basic payroll. It publishes detailed per-state tax facts including Wisconsin, and the HR module covers performance, learning, and engagement alongside payroll. Pricing is quote-based and implementation is a project rather than a signup.

Rippling

Rippling unifies payroll, HR, and IT provisioning (device and account setup) on one employee record. Its pricing page lists no rates, but Rippling's small-business page starts the platform at $8 per user per month plus a $40 monthly base fee, and its blog prices payroll as a separate module at $8 per employee billed annually.

What each provider actually costs a Wisconsin employer

The table below models published rates at three headcounts. Wisconsin is one of the states where these figures approximate the whole software cost, since there is no disability carrier, no paid leave remittance, and no local filings to add.

Patriot is the cheapest published option at every headcount, with Square and SurePayroll close behind at 10 employees. SurePayroll's $7 per-employee fee pushes it to $379 at 50 employees, above OnPay and Gusto Simple. Paychex quotes every package, so you need a sales conversation before you can set its service model against these figures.

Choosing a payroll provider for Wisconsin

Five questions separate a provider that fits Wisconsin from one that merely files its taxes. Put each of them to a vendor before you sign.

Before you choose

FirstHR is an onboarding and HR platform, not a payroll provider. Payroll runs, payroll tax filing, and benefits administration come from the providers above, so if running payroll is the problem in front of you, one of them is the answer.

What we handle is the document layer that feeds payroll: onboarding workflows, e-signatures on offer letters and acknowledgments, employee records, and document management for US small businesses at a flat $98 a month for up to 10 people or $198 for 11 to 50.

Two of the Wisconsin requirements above are document problems rather than payroll problems: getting WT-4 completed before day one alongside the federal W-4, and capturing hire details in time for the new hire report, which Wisconsin requires within twenty days of the start date.

Form WT-4, the federal W-4, and the I-9 go on the new hire's first-day list as tasks, and the completed forms are kept in their employee file; the forms themselves are completed outside the platform.

Frequently Asked Questions

What are the Wisconsin payroll taxes an employer has to handle?

Two at state level, plus federal. The first is income tax withholding, figured with the Department of Revenue's W-166 formula, while the income tax itself runs from 3.50 to 7.65 percent. The second is unemployment insurance on the first $14,000 of wages, at 3.05 percent for new non-construction employers under $500,000 of payroll. There is no local income tax, no state disability program, and no paid family leave contribution.

What are the Wisconsin income tax rates?

Four brackets at 3.50, 4.40, 5.30, and 7.65 percent, with the top rate above $332,720 for single filers and $443,630 for married filing jointly in tax year 2026. Act 15, signed July 3, 2025, widened the 4.40 percent bracket so more middle income falls there rather than at 5.30 percent. Withholding tables are different: Publication W-166 still uses 3.54 to 7.65 percent.

What is Form WT-4 and do Wisconsin employees need it?

WT-4 is the Employee's Wisconsin Withholding Exemption Certificate, required of every new hire alongside the federal W-4 since January 1, 2020, the year the federal form dropped allowances. Wisconsin withholding still works from the exemptions claimed on WT-4, and the form doubles as the state new hire report, with an employer section and the hire date.

What is the Wisconsin unemployment insurance wage base and rate?

$14,000 per employee for 2026, with Schedule D in effect under Statute 108.18, as it was in 2024 and 2025. New non-construction employers pay 3.05 percent under $500,000 of taxable payroll and 3.25 percent above; construction pays 2.50 and 2.70 percent on the same split. Experienced employers range from zero to 12 percent, and zero-rated employers must still file quarterly.

Which states have payroll tax reciprocity with Wisconsin?

Illinois, Indiana, Kentucky, and Michigan. Residents of those four who work in Wisconsin and file Form W-220 with their employer are not subject to Wisconsin withholding and are taxed at home instead. Minnesota and Iowa border Wisconsin but are not covered, so residents of those two are subject to ordinary Wisconsin withholding, which catches out employers along the Twin Cities corridor.

Does Wisconsin have local payroll taxes?

No. No city, village, town, or county levies a local income tax on wages, so there are no address-by-address local tax lookups and no separate municipal filings. Wisconsin also bars local minimum wage ordinances under Wis. Stat. 104.001, so no municipality sets a rate above the state floor.

What is the minimum wage in Wisconsin?

$7.25, matching the federal rate and unchanged since July 2009, with a tipped cash wage of $2.33 where wages plus tips average at least $7.25. An opportunity wage of $5.90 applies to workers under 20 for their first 90 consecutive days, or $2.13 for tipped opportunity employees, ending at 90 days or the twentieth birthday, whichever comes first.

How often must Wisconsin employers pay employees?

No more than 31 days may pass between pay periods under Statute 109.03, so monthly payroll is legal in Wisconsin. That is more permissive than Illinois and Indiana, which require pay at least twice a month for most employees. Employers may pay more frequently, and most do.

When must Wisconsin employers carry workers compensation insurance?

At three or more employees, full-time or part-time, or where one or more employees are paid $500 or more in gross combined wages in any calendar quarter, with coverage required by the tenth day of the first month of the next quarter. Either trigger applies independently, and the wage test catches very small employers the headcount rule would miss.