Wisconsin Business Taxes for LLCs
Learn what taxes your Wisconsin LLC owes — state income, franchise, sales, self-employment, and payroll taxes — plus which forms to file and where to register.
Bizee Editorial Staff
Editorial Team
Wisconsin LLC tax quick facts
Filing fee: $130 (online) / $170 (paper)
Processing time: 5–10 business days (online); longer for paper
State agency: Wisconsin Department of Financial Institutions (DFI)
Annual report due: Annually by the end of the quarter in which the LLC was formed
State tax rate: No entity-level income tax for default LLCs; 7.9% franchise/income tax for LLCs taxed as C corporations; individual income tax rates of 3.5%–7.65% apply to pass-through income
Wisconsin LLC tax overview
Wisconsin LLCs don't pay state income tax at the entity level by default. Instead, profits pass through to the members, who report them on their own Wisconsin individual income tax returns. Depending on your LLC's structure, you may also owe sales tax, self-employment tax, payroll taxes, or a franchise tax.
The taxes that apply to your Wisconsin LLC depend on how it's classified for federal tax purposes — as a disregarded entity, a partnership, an S corporation, or a C corporation. Getting that classification right early shapes everything else.
State income tax on pass-through income
Wisconsin taxes LLC income at the owner level, not the entity level, when the LLC is treated as a disregarded entity or a partnership. The LLC itself doesn't file a Wisconsin income tax return in most cases — the income flows to the members, who report it on their own returns.
Single-member LLC
A single-member LLC taxed as a disregarded entity reports all business income and expenses on the owner's Wisconsin individual income tax return (Form 1). No separate LLC return is required. Wisconsin individual income tax rates range from 3.5% to 7.65% depending on taxable income.
Multi-member LLC
A multi-member LLC taxed as a partnership files a Wisconsin partnership return (Form 3) to report the LLC's income, deductions, and credits. The LLC itself doesn't pay Wisconsin income tax on that income. Each member then reports their share on their own Wisconsin return.
Wisconsin franchise tax for LLCs electing C corp status
If your LLC elects to be taxed as a C corporation, Wisconsin treats it as a corporation for state tax purposes. The LLC pays Wisconsin franchise tax — not the members — at a flat rate of 7.9% on Wisconsin apportioned taxable income. The LLC must file Wisconsin Form 4 (Corporation Franchise or Income Tax Return).
This is a meaningful shift from the default pass-through structure. The entity pays tax first, and any distributions to members may be taxed again at the individual level. A tax professional can help you figure out whether a C corp election makes sense for your situation.
Pass-through entity tax (PTET) election
Wisconsin offers a pass-through entity tax (PTET) election that lets qualifying LLCs taxed as partnerships — and S corporations — pay Wisconsin income tax at the entity level instead of passing it to members. The election is made annually and is irrevocable for that tax year.
The PTET election exists primarily to help LLC members work around the federal $10,000 state and local tax (SALT) deduction cap. When the entity pays Wisconsin income tax directly, members may be able to preserve a larger federal deduction. This is a nuanced area — talk to a tax professional before making the election.
Wisconsin sales and use tax
Wisconsin LLCs that sell taxable goods or services in Wisconsin need to register with the Wisconsin Department of Revenue for a seller's permit and collect sales tax on taxable transactions. The state base rate is 5%, and some counties and municipalities add their own rate on top of that.
Milwaukee County and the City of Milwaukee, for example, impose additional local sales tax. The Wisconsin DOR provides a Sales Tax Rate Lookup tool to find the correct combined rate for a specific address. To register, file Form BTR-101 (Wisconsin Business Tax Registration) online or by paper.
Self-employment tax
LLC members who materially participate in the business generally owe federal self-employment tax on their share of business profits. Self-employment tax covers Social Security and Medicare — it's not a separate income tax. The current federal rate is 15.3% on net self-employment earnings above $400.
Wisconsin doesn't impose a separate state self-employment tax. The federal self-employment tax is reported on Schedule SE and filed with your federal Form 1040. Most LLC members also need to make quarterly estimated tax payments to both the IRS and the Wisconsin Department of Revenue to avoid underpayment penalties.
Payroll and withholding taxes
If your Wisconsin LLC has employees, you need to register with the Wisconsin Department of Revenue for a withholding tax account and withhold Wisconsin income tax from employee wages. The same Form BTR-101 used for sales tax registration also covers withholding tax registration.
On top of state withholding, you'll also have federal payroll tax obligations: federal income tax withholding, Social Security and Medicare taxes (FICA), and federal unemployment tax (FUTA). These are administered by the IRS and reported using federal payroll forms.
Other taxes and duties
Depending on your industry and business activities, your Wisconsin LLC may owe additional taxes or need additional registrations. Common examples include excise taxes on fuel, alcohol, or tobacco; use tax on out-of-state purchases used in Wisconsin; and local business licenses or occupational taxes.
The Wisconsin DOR's new business registration page is a good starting point for figuring out which additional registrations apply to your LLC. A tax professional familiar with your industry can help you figure out what else you may owe.
FAQ
It depends on how your LLC is classified. By default, Wisconsin LLCs don't pay state income tax at the entity level — profits pass through to members, who report them on their own Wisconsin individual income tax returns. Members also owe federal self-employment tax at 15.3% on net earnings. If your LLC sells taxable goods or services, you'll need to collect and remit Wisconsin sales tax at a 5% base rate plus any local additions. If you have employees, state withholding and federal payroll taxes apply. LLCs that elect C corporation status pay Wisconsin franchise tax at 7.9%.
Generally, Wisconsin taxes LLC income at the owner level, not the entity level. A single-member LLC reports income on the owner's Wisconsin Form 1. A multi-member LLC files a Wisconsin partnership return (Form 3), and each member reports their share on their own return. The LLC itself doesn't pay Wisconsin income tax in either case.
Yes. Wisconsin has a 5% state sales tax rate. Some counties and municipalities add their own rate on top of that — Milwaukee County and the City of Milwaukee are common examples. If your LLC sells taxable goods or services in Wisconsin, you need to register for a seller's permit using Form BTR-101 and collect the correct combined rate for each sale location.
Yes, but it applies only to LLCs that elect C corporation tax treatment. Wisconsin imposes a flat 7.9% franchise tax on corporations doing business in the state. Default LLCs — those taxed as disregarded entities or partnerships — are not subject to the Wisconsin franchise tax. If your LLC has elected C corp status, it must file Wisconsin Form 4.
Yes. Wisconsin has a state individual income tax with rates ranging from 3.5% to 7.65% depending on taxable income. For LLC members, this applies to their share of pass-through income from the LLC. The LLC itself doesn't pay Wisconsin income tax unless it has elected C corporation status, in which case the 7.9% franchise tax applies at the entity level.
Yes, in most cases. If you expect to owe tax on your LLC income, you'll need to make quarterly estimated tax payments to both the IRS and the Wisconsin Department of Revenue. Missing estimated payments can mean underpayment penalties at both the federal and state level. A tax professional can help you figure out the right payment schedule for your situation.
File Form BTR-101 (Wisconsin Business Tax Registration) with the Wisconsin Department of Revenue. This single form covers registration for sales and use tax, employer withholding tax, and other state business tax accounts. You can file online through the DOR's business tax portal or submit a paper form. Most LLCs that sell taxable goods or have employees need to register before they start making taxable sales or paying wages.
As a self-employed LLC owner in Wisconsin, you report your business income on your Wisconsin individual income tax return (Form 1) if your LLC is a single-member disregarded entity. You'll also file a federal Schedule C and Schedule SE to report business income and self-employment tax. If your LLC is a multi-member partnership, the LLC files Wisconsin Form 3 and issues you a Schedule 3K-1 showing your share of income to report on your own return.
