The official search
The registry is run by the Wisconsin Department of Financial Institutions, Division of Corporate and Consumer Services — most states put LLCs with the Secretary of State, but Wisconsin does not.
- Search page: https://apps.dfi.wi.gov/apps/corpsearch/nameAvailability.aspx
- Cost: Free
- Login: None required
The Name Availability Search sits inside DFI's Corporate Records Search, which also offers a simple entity search and an Advanced Search. The database covers corporations, nonstock corporations, LLCs, limited partnerships, and LLPs whose formation required a filing with DFI, plus reserved and registered names.
DFI's own guide to the system explains that the search works much like a standard web search — enter the entity name as written — and that you can also search by the seven-character DFI Entity ID# assigned when an entity organized. The Advanced Search adds a registered agent search and filters for entity type, status, and registration date, with match options such as Exact Phrase and All Words.
There is no yes-or-no verdict that binds the state. You judge availability from the results, and DFI makes the final distinguishability decision when it reviews your Articles of Organization or name reservation.
A results list shows the DFI Entity ID, entity name and type, registered effective date, and status. A detail record adds the period of existence, the annual report requirement that applies to the entity, the registered agent and registered office address, any old names, and a chronology of filing history. The public record does not publish an LLC's members or owners, its federal tax ID, or a phone number.
Step by step
- Open the Name Availability Search at apps.dfi.wi.gov and enter the name you want, as you plan to use it.
- Review every near-match, not just exact matches. Wisconsin's test is whether your name is distinguishable on DFI's records, and DFI ignores entity designators — so an existing "Badger Plumbing Inc." conflicts with "Badger Plumbing LLC."
- Run the general Corporate Records Search on the distinctive part of your name to surface spelling variants the first pass may have missed.
- Use Advanced Search to widen the net — include inactive entities and old names, and search registered agents if results are noisy.
- Check reserved names too. A name reserved under § 183.0113 counts against you even though no company exists under it yet.
- If nothing conflicting appears, the name is probably available — but only DFI's review of your actual filing is definitive.
Wisconsin's name rules
The rules are in Wisconsin Statutes § 183.0112, part of the Wisconsin Uniform Limited Liability Company Law (Chapter 183).
Designator. The name must contain "limited liability company" or "limited company," or the abbreviation "LLC" or "LC." Variations that differ only in capitalization or punctuation are fine, and "Limited" may be shortened to "Ltd." while "company" may be shortened to "Co."
Distinguishable. The name must be distinguishable on the records of the Department of Financial Institutions from:
- The name of any existing entity whose formation required a DFI filing and that is not administratively dissolved
- The name of any limited liability partnership whose statement of qualification is in effect
- Any name under which a person is registered to do business in Wisconsin through a DFI filing
- Any name reserved under § 183.0113
- Any name registered under § 183.0114
Differences that do not count. When DFI decides whether two names are distinguishable, it does not take entity-type words into account — "corporation," "Corp.," "incorporated," "Inc.," "Limited," "Ltd.," "limited partnership," "LP," "LLP," "limited liability company," "LLC," "cooperative," and similar words or abbreviations are ignored. Changing only the designator never makes a taken name available.
Regulated purposes. The name may not contain language stating or implying that the LLC is organized for a purpose regulated under another Wisconsin statute, unless that purpose is not prohibited by the other statute and the LLC is subject to all of its limitations. In plain terms, names suggesting a bank, insurer, or other regulated business invite extra scrutiny.
Reserving a name. Under § 183.0113, you can reserve a name that complies with the rules by applying to DFI. If the name is available, DFI reserves it for your exclusive use for 120 days, and the reservation can be renewed. The fee is $15, and a renewal is another $15 (§ 183.0122). A reservation is optional — it does not establish an LLC.
What the search can't tell you
- Trade names and trademarks. This is a database of filed entities. Trade names (DBAs) are registered separately with DFI, so a name that clears here can still be in use as someone's trade name.
- Sole proprietors and most partnerships. Businesses that never filed formation papers with DFI do not appear, so local competitors may be invisible here.
- A final verdict. A clear result is a good sign, not a ruling. DFI decides distinguishability when it reviews your filing.
- Trademarks, domains, and owners. The search says nothing about federal trademark rights or .com availability, and member/owner names are not part of the public record it shows.
If the name looks available
File Articles of Organization (Form 502) with the Department of Financial Institutions, online through DFI's filing system or on paper by mail.
- Cost: $130 online, or $170 on paper. Filing online is both cheaper and faster — paper carries a built-in premium on almost every DFI fee.
- One exception: if every organizer and member qualifies as a student entrepreneur under § 183.0122(2)(d) (at least 18 and enrolled in a Wisconsin postsecondary institution, high school, or home-based educational program), the fee is waived using Form 502SE. Most founders won't qualify; budget the $130.
Ongoing: the annual report (§ 183.0212).
- Fee: $25 per year online ($40 on paper) for a domestic LLC.
- Due date — read this carefully: there is no single statewide deadline. Your report is due during the calendar quarter in which the anniversary of your Articles' effective date falls, in each year after your formation year — by March 31, June 30, September 30, or December 31, depending on when you formed. Form in August, and your deadline is September 30, not your August anniversary.
- Late consequences: DFI's published fee schedule lists no flat late fee. The real risk is status: an LLC that lets its report sit unfiled can be marked delinquent and, eventually, administratively dissolved.
FAQ
Is the Wisconsin LLC name search free? Yes. The DFI Name Availability Search and Corporate Records Search are free and require no login or account.
Why isn't the Wisconsin Secretary of State handling my LLC? Because Wisconsin assigns business entity filings to the Department of Financial Institutions, Division of Corporate and Consumer Services. There is no Secretary of State LLC registry to search or file with.
Can I just change "Inc." to "LLC" to make a name available? No. Under § 183.0112(4), DFI ignores entity designators — words like "Inc.," "LLC," "Ltd.," and "Corp." — when deciding whether names are distinguishable.
How much does it cost to form a Wisconsin LLC? The Articles of Organization (Form 502) filing fee is $130 online or $170 on paper. Qualifying all-student-entrepreneur LLCs pay no fee using Form 502SE.
When is the Wisconsin LLC annual report due? By the end of the calendar quarter containing your formation anniversary — March 31, June 30, September 30, or December 31 — starting the year after you form. The fee is $25 online or $40 on paper.
Sources
- Wisconsin Department of Financial Institutions — Name Availability Search: https://apps.dfi.wi.gov/apps/corpsearch/nameAvailability.aspx
- Wisconsin Department of Financial Institutions — Corporation Fees (official fee schedule): https://dfi.wi.gov/Pages/BusinessServices/BusinessEntities/Fees.aspx
- Wisconsin Statutes § 183.0112 (permitted names): https://docs.legis.wisconsin.gov/statutes/statutes/183/i/0112
- Wisconsin Statutes § 183.0113 and § 183.0122 (name reservation, 120 days; $15 reservation fee): https://docs.legis.wisconsin.gov/document/statutes/2021/183.0116(1)(b)
- Wisconsin Statutes § 183.0212 (annual report): https://docs-preview.legis.wisconsin.gov/statutes/statutes/183/ii/0212/3?down=1