State guide
How to Register for Wisconsin Payroll Taxes
Let a dedicated tax manager file your Wisconsin registrations with you, or use the step-by-step guide below.
Last updated:
At a glance
2 agencies: Department of Revenue and Department of Workforce Development
Withholding number in 1 to 2 business days online
New employer UI rate: 3.05% (3.25% at $500,000+ taxable payroll); construction 2.50% (2.70%).
$14,000 UI wage base
Done for you
Two Wisconsin accounts, filed right
Skip the paperwork. Your dedicated PayAdvisors tax manager registers you with the state and gets your tax IDs for you. In Wisconsin that means a withholding tax number from the Department of Revenue and an unemployment account with the Department of Workforce Development.
- One tax manager who owns your file
- Business Tax Registration and DWD registration filed with you
- Withholding estimate set so your filing frequency fits
- Both account numbers confirmed before payroll
Hands-on help from a real person who knows Wisconsin employer accounts. Use it alone or with managed payroll.
Quick answer
Wisconsin payroll tax registration at a glance
Wisconsin uses two agencies. The Department of Revenue (DOR) issues your withholding tax number through Business Tax Registration, and online applications get a number within one to two business days. The Department of Workforce Development (DWD) runs unemployment insurance (UI) through its online New Employer Registration.
For 2026, the new employer UI rate is 3.05% (3.25% at $500,000+ taxable payroll); construction 2.50% (2.70%). It applies to the first $14,000 of each employee's wages and stays fixed for your first three calendar years.
Who must register
Who registers in Wisconsin
UI liability can reach back to January 1.
| Situation | Wisconsin requirement |
|---|---|
| You pay wages subject to Wisconsin withholding | Register with DOR for a withholding tax number |
| $1,500 or more in wages in any calendar quarter, this year or last | Liable for UI, retroactive to January 1 |
| One or more employees in each of 20 or more calendar weeks, this year or last | Liable for UI, retroactive to January 1 |
| Subject to federal unemployment tax (FUTA) on total payroll in all states | Liable from your first Wisconsin payroll of the year |
| Part-time workers, paid corporate officers and commission salespeople | They count as employees |
Registration steps
How to register in Wisconsin
Two applications, both online.
- Apply for Business Tax Registration at tap.revenue.wi.gov/btr, or mail or fax Form BTR-101.
- Fill in every field. Leaving out your first date of withholding, your federal EIN or your estimate of tax to be withheld can delay processing.
- Pay the $20 registration fee. It covers two years, then a $10 renewal applies every two years.
- Register with DWD using its online New Employer Registration application.
- Collect Form WT-4 from every new employee for Wisconsin withholding.
Two agencies, two schedules
Wisconsin rewards a complete first application
Missing details slow the DOR number, and the frequency DOR assigns follows what you tell it.
On your own
- Estimating withholding for DOR
- Tracking WT-6 deposits and DWD quarterly reports
- Watching the $500,000 payroll line for your UI rate
With your PayAdvisors tax manager
- Your tax manager sets the estimate with you
- You get one calendar for every filing
- We check your rate notice with you each year
Handled by your tax manager.
Prepare
What to collect first
DOR and DWD ask for different details.
- Your federal EIN
- Your first date of withholding and an estimate of the Wisconsin tax you will withhold
- Names and Social Security numbers of owners, partners, members or corporate officers
- The date you first paid, or expect to pay, wages for work in Wisconsin
- Whether you are an S corporation, since officers' compensation must be shown as wages
- Details of any Wisconsin business you acquired
Accounts
What you end up with
Two numbers, each for its own agency.
- A 15-digit Wisconsin withholding tax number (036-0000000000-00 format). It is different from your federal EIN and stays with you unless you close the account.
- A filing frequency that DOR assigns from your application, and may change from January 1 if your withholding changes.
- A DWD UI account, with a yearly rate notice (Form UCT-100B) usually in mid-October after your new employer years.
2026 numbers
Wisconsin payroll tax rates for 2026
The new employer rate depends on your industry and payroll size.
| Item | 2026 figure |
|---|---|
| New employer UI rate | 3.05% (3.25% at $500,000+ taxable payroll); construction 2.50% (2.70%). |
| UI taxable wage base | $14,000 per employee |
| New employer rate period | First three calendar years |
| Business Tax Registration fee | $20 for two years, then $10 every two years |
Pitfalls
Wisconsin mistakes to avoid
Most problems are missed reports, not missed tax.
- Skipping a WT-6 when nothing was withheld. Quarterly, monthly and semi-monthly filers file a deposit report every period.
- Waiting on the number to file. Not having your withholding number yet does not excuse late reports or deposits.
- Using a common paymaster. Wisconsin does not allow it. Each corporation with its own EIN needs its own withholding number.
- Filing UI reports on paper at 25 or more employees. Electronic filing is then required, and paper filing can bring a $25 penalty.
- Late withholding. Willful neglect brings a $50 late fee ($150 for corporations taxed under subch. IV), plus a 5% a month negligence penalty up to 25%, and 18% a year interest.
Related duties
Other Wisconsin employer obligations
These run alongside the tax accounts.
- Workers' compensation. Required on the day you hire your third employee, or once you pay $500 or more in gross wages in a calendar quarter (insure by the 10th day of the next quarter's first month). See DWD Worker's Compensation.
- New hire reporting. Report to the State Directory of New Hires within 20 days.
- Form WT-4 copies. Send DOR a copy when an employee claims more than 10 exemptions, or complete exemption while earning over $200 a week.
- DWD paper reports end. DWD will stop mailing quarterly tax reports in 2027, so plan to file online.
Filing calendar
Wisconsin deadlines after registration
Your DOR frequency decides how often you file WT-6.
- Monthly or quarterly WT-6: by the last day of the month after the period.
- Semi-monthly WT-6: pay dates from the 1st to the 15th are due by the end of that month; pay dates from the 16th on are due the 15th of the next month.
- Annual filers: no WT-6; report withholding on Form WT-7.
- WT-7 annual reconciliation: January 31.
- DWD quarterly contribution report: April 30, July 31, October 31 and January 31, moved to the next business day for a weekend or holiday.
Official links
Wisconsin agency links
Official forms, rates and guidance.
- DOR: Publication W-166, Withholding Tax Guide
- DOR: General withholding tax questions
- DWD: 2026 Wisconsin Employer Report (UCT-1-E)
- DWD: Unemployment insurance tax rates
- DWD: Register a business
- DWD: Handbook for Employers, account reporting
- DWD: File tax and wage reports
- DWD: New hire reporting
- DWD: Worker's compensation for employers
- DOR withholding: (608) 266-2776
Wisconsin registration questions
How do I register for Wisconsin payroll taxes?
Apply for a withholding tax number through DOR Business Tax Registration (online or Form BTR-101), and register separately with DWD using its online New Employer Registration.
How long does a Wisconsin withholding number take?
One to two business days online. Mailed or faxed BTR-101 applications take about 15 business days.
What is the 2026 Wisconsin new employer UI rate?
3.05% (3.25% at $500,000+ taxable payroll); construction 2.50% (2.70%). It applies to the first $14,000 of each employee's wages.
When does a Wisconsin employer owe UI tax?
After paying $1,500 in wages in a calendar quarter, or employing someone in 20 or more weeks, in the current or prior year. Liability goes back to January 1 of that year.
How often do I file Wisconsin withholding?
DOR assigns annual, quarterly, monthly or semi-monthly filing based on your application, and reviews it each year.
I am the only employee of my S corporation. What do I need in Wisconsin?
If you are paid, you need the withholding number, and paid corporate officers count as employees for Wisconsin UI. A dedicated tax manager can complete the registration with you as part of our S corp payroll package.
When are new hires due in Wisconsin?
Within 20 days, to the State Directory of New Hires.
How is registration priced?
Most states issue two IDs, one for withholding and one for unemployment insurance. Pricing depends on the states and accounts involved. We'll quote it on a quick consultation.
Is this tax advice?
No. It summarizes official guidance from the Wisconsin Department of Revenue and the Department of Workforce Development. Ask your CPA or tax advisor about your own facts.
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Next step
Let us set up Wisconsin with you
A dedicated tax manager files your DOR and DWD registrations with you, sets your withholding estimate and confirms both accounts before your first payroll.
About this guide
Last verified and sources
Last verified October 28, 2026 against the Wisconsin Department of Revenue and the Department of Workforce Development. This guide is general information, not tax or legal advice.
Related
- State payroll tax registration (all states)
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- Oklahoma payroll tax registration guide
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- Iowa payroll tax registration guide
- Kansas payroll tax registration guide
- Arkansas payroll tax registration guide
- New Mexico payroll tax registration guide
- Payroll setup for new businesses
- Payroll tax filing and compliance
- S corp payroll
- S corp payroll setup checklist
- Payroll processing
- Our services
Sources
- Wisconsin Department of Revenue, Publication W-166, Withholding Tax Guide (1/26)
- Wisconsin Department of Revenue, General Withholding Tax Questions
- Wisconsin DWD, UCT-1-E, 2026 Wisconsin Employer Report (R. 01/2026)
- Wisconsin DWD, Unemployment Insurance Tax Rates (page now headed 2027 Tax Rates)
- Wisconsin DWD, Register a Business
- Wisconsin DWD, Handbook for Employers (UCB-201), Account Reporting
- Wisconsin DWD, File Tax Report
- Wisconsin DWD, Wisconsin New Hire Reporting
- Wisconsin DWD, Worker's Compensation, Employers