Wisconsin Business Name Checker
Check if your business name is available in Wisconsin. Validate state naming rules instantly, then search the Department of Financial Institutions' corporate records free at dfi.wi.gov — Wisconsin business filings do not go through the Secretary of State.
Validate the name format, then search the official Wisconsin Dept. of Financial Institutions — Corporate Records Search records.
1.Search the state registry (Wisconsin Dept. of Financial Institutions — Corporate Records Search) for existing LLCs, corporations, and reserved names
2.Check federal trademarks at USPTO.gov — state approval does not protect you from trademark claims
3.Verify the .com domain is available for your name
4.Grab matching social media handles (Instagram, X, LinkedIn, Facebook)
5.Lock the name in by filing your formation documents — or reserve it first (details below)
Fee
$15
Holds the name for
120 days (some entity types get 60-day terms)
How to file
Name Reservation Application (Form CORP1) filed with the Department of Financial Institutions by mail or email
Whether a standard reservation renews is not clearly stated — confirm with DFI. Uniquely, Wisconsin also offers a 10-year long-term name reservation, and expedited options exist.
How Business Name Availability Works in Wisconsin
Wisconsin files its businesses with the Department of Financial Institutions (DFI) — the Secretary of State has no role in entity registration here. The free corporate records search now lives at dfi.wi.gov (the old wdfi.org domain has migrated), covering LLCs, corporations, and reserved names with statuses and filing histories.
Naming follows Wis. Stat. § 183.0112: an LLC name must contain "limited liability company" or "limited liability co.," or the abbreviation LLC or L.L.C., and it generally must be distinguishable upon DFI's records from existing and reserved names. Corporations, under § 180.0401, need "corporation," "incorporated," "company," or "limited" or an abbreviation.
Reservations are a bargain at $15 for 120 days (Form CORP1, filed by mail or email — though some entity types get 60-day terms), and Wisconsin adds something almost no other state has: a 10-year long-term name reservation for names you want to bank well ahead of use. Forming the LLC costs $130 online, with a modest $25 annual report after that.
Wisconsin Business Name Requirements
✓ Name Requirements
- • LLCs must include "LLC", "L.L.C.", "Limited Liability Company" or "Limited Liability Co."
- • Corporations must include "Inc.", "Corp.", "Co." or "Ltd."
- • Generally must be distinguishable upon the records of the Department of Financial Institutions from existing entities and reserved names (Wis. Stat. § 183.0112(2))
- • Cannot suggest a government affiliation
- • Cannot be misleading about business purpose
- • Governed by Wis. Stat. § 183.0112 (LLCs) and § 180.0401 (corporations)
✗ Restricted Words
- • "Bank" — banking terms generally require review by the DFI's Division of Banking — the same agency that handles your formation
- • "Trust" — implies trust-company powers — DFI Division of Banking review is generally required
- • "Credit Union" — restricted to chartered credit unions overseen by the DFI's Office of Credit Unions
- • "Savings" — savings-institution wording is generally reviewed by the Division of Banking
- • "Insurance" — insurance-related names are typically reviewed under the Office of the Commissioner of Insurance's rules
- • "Olympic" — federally protected under the Ted Stevens Olympic and Amateur Sports Act
How to Check Name Availability in Wisconsin
Use the tool above to open the Wisconsin Dept. of Financial Institutions — Corporate Records Search search and look up existing LLCs, corporations, and reserved names. Wisconsin's business registry lives at the Department of Financial Institutions (DFI), not the Secretary of State — and the old wdfi.org search domain has migrated to dfi.wi.gov. Wisconsin is also the rare state offering a 10-year long-term name reservation.
Search the USPTO database at uspto.gov — clearing the Wisconsin registry does not protect you from a federal trademark claim.
Check that the matching .com domain is available before you commit — renaming an LLC later means an amendment filing and new bank paperwork.
Confirm your name is free on Instagram, X, Facebook, and LinkedIn so your branding stays consistent everywhere.
Wisconsin lets you reserve a name for 120 days (some entity types get 60-day terms) for $15 — Name Reservation Application (Form CORP1) filed with the Department of Financial Institutions by mail or email.
What Registering a Name Costs in Wisconsin
| Filing | State Fee | Frequency |
|---|---|---|
| LLC formation filing | $130 | One-time |
| Annual report / recurring fee | $25 | Yearly |
| Name reservation | $15 | Holds the name 120 days (some entity types get 60-day terms) |
| Tradename | Wisconsin has no mandatory state DBA. Sole proprietors can optionally register a tradename through DFI's Trademarks section for around $15 — confirm the current fee with DFI. | |
State filing fees as of 2026. See the Wisconsin LLC tax and fee calculator for the full annual cost picture.
Frequently Asked Questions
How do I check if a business name is taken in Wisconsin for free?
Search the Department of Financial Institutions' corporate records at dfi.wi.gov — the search is free and covers Wisconsin LLCs, corporations, and reserved names. Note that the old wdfi.org search domain has migrated to dfi.wi.gov. Because Wisconsin has no mandatory DBA registry, also run a web search and a USPTO trademark check to catch trade names that never touched the state's records.
How much does it cost to reserve a business name in Wisconsin?
A standard Wisconsin name reservation costs $15 and holds the name for 120 days for most entity types (some are limited to 60 days). File the Name Reservation Application, Form CORP1, with the Department of Financial Institutions by mail or email. Whether the standard reservation can be renewed is not clearly stated, so confirm with DFI — or use Wisconsin's unusual 10-year long-term reservation if you need more runway.
What suffix does a Wisconsin LLC name need?
Under Wis. Stat. § 183.0112, a Wisconsin LLC name must contain "limited liability company" or "limited liability co.," or the abbreviation "LLC" or "L.L.C." Corporations follow Wis. Stat. § 180.0401 and must include "corporation," "incorporated," "company," or "limited," or an abbreviation. The name generally must also be distinguishable upon DFI's records from existing and reserved names.
What is Wisconsin's 10-year long-term name reservation?
Wisconsin is nearly unique in offering a long-term name reservation that holds a business name for 10 years, alongside the standard $15, 120-day reservation. It suits brands planned far in advance, companies protecting related names, or businesses relocating to Wisconsin on a long timeline. Contact the Department of Financial Institutions for the current long-term fee and filing mechanics before relying on it.
Does Wisconsin require a DBA to use a trade name?
No — Wisconsin has no mandatory state DBA filing, which is unusual. A sole proprietor may operate under a trade name without registering it anywhere. If you want the name on the public record, you can optionally register a tradename through DFI's Trademarks section for around $15 (confirm the current fee with DFI). Registered or not, a trade name carries no exclusive rights — trademarks and entity names do the protecting.
Why does Wisconsin file businesses with the Department of Financial Institutions?
Wisconsin assigned corporate registration to the Department of Financial Institutions rather than the Secretary of State, so DFI runs the entity database, name reservations, formations ($130 online for an LLC), and the $25 annual report. Practically, just remember the address: dfi.wi.gov, which replaced the old wdfi.org domain. If a guide sends you to the Wisconsin Secretary of State for an LLC filing, it is out of date.
Related Tools
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Checking a Name in Another State?
Searching Wisconsin Names at the Department of Financial Institutions
DFI's corporate records search at dfi.wi.gov is free and authoritative for Wisconsin entities: LLCs, corporations, and reserved names, with entity status, registered agent, and filing history. If bookmarks or old guides point you to wdfi.org, update them — the search migrated to the dfi.wi.gov domain.
Wisconsin has no mandatory DBA registry, so unregistered trade names will not appear anywhere in the state's records. That makes the supplemental sweep — web search, social handles, USPTO trademarks, and DFI's own trademark registrations — more important here than in states that force every trade name onto the public record.
When the name is clear, reserve it for $15 (Form CORP1) or file the Articles of Organization for $130 online. Expedited options exist if you are on a deadline.
Wisconsin Naming Rules Under Wis. Stat. § 183.0112
A Wisconsin LLC name must contain "limited liability company" or "limited liability co.," or the abbreviation "LLC" or "L.L.C." Corporations follow § 180.0401 — "corporation," "incorporated," "company," or "limited," or an abbreviation. Under § 183.0112(2), the name generally must be distinguishable upon the records of the Department of Financial Institutions.
The usual distinguishability logic applies: cosmetic edits (punctuation, spacing, a different designator) rarely separate you from an existing name; a different substantive word does. Reserved names block you just like active entities, so check both.
Financial words face an ironic hurdle in Wisconsin: bank, trust, savings, and credit-union terms are generally reviewed by divisions of the very department that registers your LLC — the DFI's Division of Banking and Office of Credit Unions — while insurance wording is typically reviewed under the Commissioner of Insurance's rules.
The $15 Reservation and Wisconsin's 10-Year Option
Wisconsin's standard reservation is one of the country's cheapest: $15, filed on the Name Reservation Application (Form CORP1) with DFI by mail or email, holding the name for 120 days for most entity types (some get 60-day terms). Whether it renews is not clearly stated, so confirm with DFI before counting on an extension.
The unusual instrument is the long-term name reservation: Wisconsin lets you lock a name for 10 years — useful for brands planned well ahead, parent companies protecting a family of names, or businesses relocating to Wisconsin on a long timeline. Almost no other state offers anything comparable.
On the DBA front, Wisconsin is laissez-faire: there is no mandatory state DBA filing. Sole proprietors who want a public record of their trade name can optionally register a tradename through DFI's Trademarks section for around $15 (confirm the current fee). Like any DBA, it documents use — it does not create exclusive rights.
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