How to File LLC Taxes in Wisconsin (2026)
A single-member Wisconsin LLC reports its profit on the owner's Form 1, with Schedule DE attached. A multi-member LLC files Form 3. An S-corp election means Form 5S, and a C-corp election means Form 4. All four go to the Wisconsin Department of Revenue.
This page covers which form fits your LLC and the current Wisconsin tax rates. It also explains the pass-through entity tax election and other state taxes that may apply. The federal side only gets as much detail as it changes your state filing.
Quick Summary
- Wisconsin taxes LLC profits through two agencies. Confirm your form and due date with the DOR before you file.
- Rates can shift each year. Recheck the current rate on the DOR site before you file.
- Have a CPA model any S-corp or PTET election first. Both change your tax bill in ways a calculator won't catch.
Wisconsin LLC Tax Summary
Here's the form, agency and deadline for each way a Wisconsin LLC can be taxed, so you can find your row before reading the details below.
| LLC Type | Federal Form | State Form | Filed With | Filing Deadline & Tax Rate |
|---|---|---|---|---|
| Single-member LLC | Form 1040 (Schedule C) | Form 1 + Schedule DE | Wisconsin DOR | Individual rates, 3.50%-7.65% |
| Multi-member LLC | Form 1065 | Form 3 | Wisconsin DOR | March 15; pass-through to members' individual rates |
| S-Corp election | Form 1120S | Form 5S | Wisconsin DOR | April 15; pass-through, or 7.9% if PTET elected |
| C-Corp election | Form 1120 | Form 4 | Wisconsin DOR | April 15; flat 7.9% |
Wisconsin state taxes by LLC type
Wisconsin's Department of Revenue mirrors the IRS default classification. One owner means a disregarded entity, and two or more owners means a partnership.
That changes only if you file an election to be taxed as a corporation instead [1]. Whatever you choose federally carries straight through to your Wisconsin form.
If you're still weighing entity types before you start an LLC in Wisconsin, the formation guide walks through registration. A registered agent in Wisconsin receives your official state mail, and the file LLC taxes hub covers the fuller federal picture.
1. Single-member LLC: Form 1
A single-member LLC is disregarded for both federal and Wisconsin tax purposes. It never files its own business return. Instead, you report the LLC's income and expenses on your personal Form 1 and attach Schedule DE.
File both your Form 1 and Schedule DE together. Confirm the current due date on the DOR site before you file.
2. Multi-member LLC: Form 3
Two or more owners default to partnership treatment. The LLC files Form 3, the Wisconsin Partnership Return, by March 15 for a calendar-year LLC. Each member then reports their share of the profit or loss on their own Form 1.
Wisconsin grants a six-month extension if you check the box on Form 3. A federal extension automatically extends the state deadline too.
3. S-Corp election: Form 5S
S-corp status can lower the self-employment tax on an LLC's profits. Only your wages are subject to it, instead of the whole distribution. You elect it federally with Form 2553, then file Form 5S with Wisconsin each year by April 15.
Shareholders normally still pay tax on their share individually. That changes only if the LLC also makes the pass-through entity tax election covered below.
4. C-Corp election: Form 4
C-corp status can make sense for an LLC that wants to offer fringe benefits, like health coverage, at a lower net cost. That matters most once you have employees.
You elect it federally with Form 8832. Then file Form 4 with Wisconsin by April 15 for a calendar-year filer.
Wisconsin taxes the corporation's net income directly at a flat 7.9%. Profits are taxed once at the entity level and again if paid out as dividends.
5. Wisconsin income tax rate for tax year 2026
For an LLC taxed as a pass-through instead of a C-corp, Wisconsin taxes the profit at your individual rate once it reaches your personal return. That rate runs from 3.50% to 7.65% across four brackets, depending on your income and filing status [2].
The DOR's most recently published bracket set is for tax year 2025. Wisconsin updates the dollar thresholds later in the year, so confirm the exact cutoffs for your filing status on the DOR rate page.
Federal taxes Wisconsin LLC owners pay
Every member who takes profits from a pass-through LLC owes federal self-employment tax on top of federal income tax. The rate is 15.3%, split between Social Security and Medicare [3].
If you expect to owe at least $1,000 in tax for the year, after subtracting withholding and credits, the IRS wants quarterly estimated payments. Those fall on April 15, June 15, September 15 and January 15 [4].
Other Wisconsin taxes that may apply
A handful of other Wisconsin taxes kick in once your LLC hires staff or sells taxable goods or services. None of these replace the income or franchise tax above. They stack on top of it, depending on what your business does.
1. Wisconsin employer taxes
Once your LLC has employees, register for unemployment insurance with the Department of Workforce Development. For 2026, new employers pay 3.05%. Experienced employers pay anywhere from 0.00% to 12.00%, based on claims history, on the first $14,000 of each employee's wages [5].
2. Sales and use tax
If your LLC sells taxable goods or services in Wisconsin, register with the DOR for a seller's permit before your first sale. The state rate is 5%. Most counties add a 0.5% county tax on top, and the city of Milwaukee adds another 2%.
Collect the right combined rate for where the sale happens, and remit it on the schedule the DOR assigns you.
3. Industry and local taxes
Wisconsin charges excise taxes on top of ordinary sales tax for specific goods: alcohol, tobacco and motor fuel. If your LLC operates in one of those industries, the excise tax applies alongside your regular sales tax collection. Budget for both.
Wisconsin pass-through entity tax (PTET) election
Wisconsin lets an LLC taxed as a partnership or S-corp elect to pay state tax at the entity level, instead of passing it through to members. The entity pays a flat 7.9%, the same rate as the corporate franchise tax.
It can help around the federal SALT deduction limit, which caps an individual's itemized deduction at $40,000 and phases down to a floor of $10,000 for higher earners [6].
Owners holding more than 50% of the LLC's capital and profit interests have to consent. A partnership elects by checking the box on Form 3, and an S-corp checks box 7 on Form 5S.
The election is made fresh each year, by the extended due date of that return, and it can be revoked the same way.
What is deductible for a Wisconsin LLC
An LLC taxed as a partnership can pass certain Wisconsin-specific credits through to its members, like the angel investment credit and the business development credit. Eligibility rules vary by credit and industry.
The federal qualified business income deduction under Section 199A lets eligible pass-through owners deduct up to 20% of business income on their federal return, though it isn't available to a C-corp [7]. It doesn't change what you owe Wisconsin.
FAQs
Does Wisconsin Have a State Income Tax on LLC Profits?
Yes, Wisconsin has a state income tax on LLC profits that pass through to your personal return. For single filers and heads of household, the 3.50% starting bracket applies up to $14,680 of taxable income before higher rates kick in.
What Form Does a Multi-Member Wisconsin LLC File?
A multi-member Wisconsin LLC's Form 3 filing alone doesn't create an entity-level tax bill unless the LLC elects PTET, since profit normally flows to each member's own return.
Can a Wisconsin LLC Elect the Pass-Through Entity Tax?
Yes, a Wisconsin LLC can elect the pass-through entity tax. A partnership revokes it later by filing an amended Form 3 with the same majority consent that made the original election.
References:
- https://www.revenue.wi.gov/DOR%20Publications/pb119.pdf
- https://www.revenue.wi.gov/Pages/FAQS/pcs-taxrates.aspx
- https://www.irs.gov/businesses/small-businesses-self-employed/self-employment-tax-social-security-and-medicare-taxes
- https://www.irs.gov/faqs/estimated-tax
- https://dwd.wisconsin.gov/ui/employers/taxrates.htm
- https://www.irs.gov/taxtopics/tc503
- https://www.irs.gov/newsroom/qualified-business-income-deduction
