How to Name Your Wisconsin LLC

Filing fee: $130 (online) / $170 (paper)

Processing time: Typically 5–10 business days online

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 state-level LLC franchise tax; income taxed at individual or corporate rates

To name your Wisconsin LLC, you need a name that's distinguishable from every other registered business in the state, includes a required LLC designator like "LLC" or "Limited Liability Company," and clears a name availability search through the Wisconsin Department of Financial Institutions (DFI) before you file.

Naming rules for a Wisconsin LLC

Wisconsin LLC naming rules fall into 2 categories: rules that apply to every LLC in every state, and rules specific to Wisconsin. Both apply to your name before you file.

• Your name must include a required designator. Wisconsin law requires the words "Limited Liability Company" or "Limited Company," or an abbreviation — "LLC," "LC," "L.L.C.," "L.C.," "Ltd.," or "Co." — as part of the legal name.
• Your name must be distinguishable. It can't be the same as or confusingly similar to any other business entity already on file with the Wisconsin DFI. Names that differ only by punctuation, spacing, or common words like "the" or "and" are generally not considered distinguishable.
• Your name can't imply a government connection. Wisconsin won't allow names that suggest affiliation with a federal or state agency.
• Certain words require additional approval. Words like "bank," "insurance," or "university" may require a separate license or written consent from the relevant state agency before the DFI will accept the name.

The distinguishability rule is the one that catches people off guard most often. Two names can look different to you and still be flagged as too similar by the DFI — so running the name availability search before you get attached to a name is worth doing early.

How to search Wisconsin LLC name availability

Check name availability through the Wisconsin DFI's Corporate Records Search system before you file. The DFI provides 2 tools: a general entity search and a dedicated Name Availability Search page. Both are free to use.

When you search, enter only the core part of your proposed name — leave out the LLC designator and filler words like "the" or "of." This surfaces more potential conflicts and gives you a clearer picture of what's already registered. If the search returns a name that's identical or very close to yours, you'll need to choose something different before filing.

Trademarks and service marks

A DFI name availability search only checks Wisconsin state registrations. It won't tell you whether your name conflicts with a federally registered trademark or a service mark held by a business in another state.

Before you commit to a name, search the USPTO's Trademark Electronic Search System (TESS) at uspto.gov to check for federal trademark conflicts. If another business holds a registered trademark on a name that's the same as or similar to yours, using it can put you on the hook for trademark infringement — even if the DFI approved your filing. A trademark attorney can help you figure out whether a name is clear to use.

Wisconsin DBA and trade names

If you want to run your business under a name that's different from your LLC's legal name, you can register a DBA — also called a trade name or "doing business as" name — in Wisconsin. This lets you market under a different name without forming a separate legal entity.

Wisconsin DBA registrations are filed at the county level, not with the state DFI. You'll register with the Register of Deeds in the county where your business operates. Requirements and fees vary by county, so check with your local office for the specifics. A DBA doesn't replace your LLC's legal name — it's an additional name you can use publicly.

How to reserve a Wisconsin LLC name

If you've found an available name but aren't ready to file your Articles of Organization yet, you can reserve it with the Wisconsin DFI using Form CORP-1, the Name Reservation Application. A reservation holds the name while you finish preparing your formation documents.

The reserved name must still comply with all Wisconsin naming rules, including the required LLC designator. Reservation doesn't guarantee the name will be available indefinitely — check the DFI for the current reservation period before you file.

How to change your Wisconsin LLC name

To change your LLC's legal name in Wisconsin, you file Articles of Amendment (Form 504) with the Wisconsin DFI. The form asks for your current LLC name, the date of your original Articles of Organization, and the text of the amendment — which is where you specify the new name.

Before filing Form 504, run a name availability search to confirm the new name is distinguishable from existing Wisconsin registrations. If the new name is already taken, the DFI will reject the amendment and you'll need to start over with a different name.