How to Do Payroll in Wisconsin: A Step-by-Step Guide

Last reviewed: July 2026

Running payroll in Wisconsin comes down to a handful of registrations, one state withholding form, and a filing calendar you need to keep on top of every quarter. None of it is complicated on its own. The trouble comes from missing a step early and paying for it later in penalties. Here is the order to do it in, with the real agency names and links you will need.

1. Get Your Federal EIN

Before you touch any Wisconsin paperwork, get a federal Employer Identification Number from the IRS. It is free, it takes about fifteen minutes online at IRS.gov, and you will use it on every state registration that follows. Apply for it as soon as you know you are hiring, not the week before your first payday.

2. Register with the Wisconsin Department of Revenue

Wisconsin state income tax withholding is handled by the Wisconsin Department of Revenue. Register for a withholding tax account before your first payroll run. Once registered, you will get an account number that goes on every withholding deposit and return you file going forward.

From the Payroll Desk

Registration can take longer than you expect during busy periods. Start it the day you sign your first job offer, not the day before payday.

3. Register with the Wisconsin Department of Workforce Development

Unemployment insurance in Wisconsin is administered by the Wisconsin Department of Workforce Development (DWD). You need a separate SUI account here, apart from your Department of Revenue withholding account. DWD assigns you an employer account number and your initial SUI rate, and you will file wage reports with them every quarter.

You also owe federal and Wisconsin new hire reporting for every employee you bring on. Report new hires to the Wisconsin New Hire Reporting Center within 20 days of the start date. See our new hire reporting guide for the details that apply everywhere, not just Wisconsin.

4. Form WT-4: State Withholding

Every new employee should complete Form WT-4, the Employee's Wisconsin Withholding Exemption Certificate, alongside their federal W-4. It tells you how many exemptions to apply when you calculate state withholding. If an employee claims complete exemption and earns more than $200 a week, or claims more than ten exemptions, you are required to send a copy of that WT-4 to the Department of Revenue. Employees who use the WT-4 to claim full exemption need to file a new one every year, since the exemption expires April 30.

If you want to sanity-check your own withholding setup before running payroll, our W-4 helper tool walks through the federal side step by step.

5. Wisconsin SUI: Rate and Wage Base

SUI is an employer-paid tax, not something you withhold from wages. For 2026, Wisconsin's taxable wage base is $14,000 per employee, and new employers are assigned a rate of 3.05% for their first few years in business. After that, DWD moves you to an experience rating based on your claims history, and rates can range anywhere from 0.00% up to 12.00%.

You will file a quarterly wage report with DWD whether or not you had any payroll that quarter. Missing a filing, even a zero-wage one, can trigger penalties and complicate your rate assignment down the line.

6. Pay Frequency and Final Pay

Wisconsin law sets a floor, not a ceiling, on how often you pay employees. Under Wis. Stat. 109.03, most employers must pay wages at least monthly, with no more than 31 days between pay periods. Weekly, biweekly, and semi-monthly schedules are all common and all legal, since they pay more often than the monthly minimum requires. A few occupations, including logging and farm labor, follow a different schedule under the statute, and a valid collective bargaining agreement can also set its own frequency.

Final pay works on the same clock. When someone leaves your company, whether they quit or were let go, you owe their final wages by the next regular payday or within 31 days of their last day worked, whichever comes first. If your business closes, merges, or relocates, that window narrows to 24 hours. An employee who was not paid on time because they were absent can demand payment, and you then have six days to pay them.

7. Deposit and Filing Calendar

Once payroll is running, the calendar looks like this:

For the federal side of quarterly filing, see our Form 941 guide. It covers the deposit rules that apply no matter which state you operate in.

8. Year-End W-2 Filing

By January 31, you need to give every employee a completed W-2 and file copies with the Social Security Administration. Box 16 should show Wisconsin wages and Box 17 should show Wisconsin tax withheld, and those totals need to tie out against what you deposited with the Department of Revenue over the year. If the numbers do not match, expect a letter asking you to explain the gap, so it is worth reconciling before you file rather than after.

Frequently Asked Questions

How do I register as a new employer in Wisconsin?

Get a federal EIN from the IRS, then register with the Wisconsin Department of Revenue for withholding tax and with the Wisconsin Department of Workforce Development for unemployment insurance. Complete both before your first payroll.

What form do Wisconsin employees use for state withholding?

Wisconsin employees fill out Form WT-4, the Employee's Wisconsin Withholding Exemption Certificate. It works alongside the federal W-4 and tells you how much state income tax to withhold from each paycheck.

What is the Wisconsin SUI wage base and new employer rate for 2026?

For 2026, Wisconsin's SUI taxable wage base is $14,000 per employee, and new employers pay a rate of 3.05%. Your rate can change after a few years once the state assigns you an experience rating.

How often do I need to pay employees in Wisconsin?

Wisconsin law requires employers to pay wages at least monthly, with no more than 31 days between pay periods, unless a collective bargaining agreement or an exempt occupation sets a different schedule. Most small businesses pay weekly, biweekly, or semi-monthly.

When are Wisconsin payroll taxes and W-2s due?

Wisconsin SUI wage reports are due quarterly, by the last day of the month following each quarter. State withholding deposits follow the schedule the Department of Revenue assigns you, either monthly or quarterly. W-2s are due to employees and to the Social Security Administration by January 31.

Want to see what a Wisconsin paycheck actually looks like after taxes? Try our Wisconsin paycheck calculator to run the numbers for a specific employee.