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How to Check If an LLC Name Is Available in Idaho

Last verified: November 2, 2026 · Sources are cited at the bottom of this page.

The short answer

Short answer: Idaho's official search is the Secretary of State's SOSBiz Business Search at sosbiz.idaho.gov. It is free and needs no login. The trap: a name stops blocking you once its owner has been administratively dissolved for more than six months — so a name can look safely available, be approved, and then have its old owner reinstate and come back with almost the same name.

The official search

The registry is run by the Idaho Secretary of State, in one system called SOSBiz — searching, forming, annual reports, and reservations all live there.

The database covers LLCs, corporations, limited partnerships, LLPs, and other filing entities registered in Idaho, foreign companies registered in Idaho, reserved and registered names, and assumed business names (Idaho's version of a DBA).

There is no separate "name availability" tool that gives a yes or no. You judge availability from the results, and the Secretary of State decides when your Certificate of Organization or reservation is reviewed. The state's own formation form advises contacting the Secretary of State to check availability before filing.

A search result shows the business name, file number, entity type, status, filing date, and registered agent. Opening a record adds the filing history and documents on file. One status matters more than the rest: Administratively Dissolved — see the name rules for why its date decides whether the name blocks you.

Step by step

  1. Open the SOSBiz Business Search and type your proposed name into the search box — leave off "LLC" so you also catch corporations and other entity types.
  2. Open Advanced Search Options and switch the match to "Contains." The search starts with your first word by default, so a distinctive word in the middle of a name will not surface until you use "Contains."
  3. Search your most distinctive word on its own. This is how you find sound-alike and near-miss conflicts, not just exact matches. (The Registered Agent filter and file-number search are for checking a specific existing business.)
  4. Open any close match and check its status and filing date. An active company blocks you, and so does a recently dissolved one. A company administratively dissolved for more than six months no longer blocks a new filing — but read the warning below before building on its name.
  5. If nothing conflicting appears, the name is probably available — but only the Secretary of State's review of your actual filing is definitive.

Idaho's name rules

The rules are in Idaho Code §§ 30-21-301 and 30-21-302.

Designator. The name must contain "limited liability company" or "limited company," or the abbreviation "L.L.C.," "LLC," "L.C.," or "LC." ("Limited" can be shortened to "Ltd." and "company" to "Co." as part of those phrases.) A professional LLC may add "Professional" or a leading "P," as in PLLC.

Distinguishable. The name must be distinguishable on the records of the Secretary of State from:

  1. The name of an existing Idaho filing entity that has not been administratively dissolved for more than six months
  2. The name of a limited liability partnership whose statement of qualification is in effect
  3. The name under which a foreign entity is registered to do business in Idaho
  4. A name reserved under § 30-21-303
  5. A name registered under § 30-21-304

Notice what is not on that list: assumed business names (DBAs) appear in the same search, but the statute does not list them as a category your name is tested against.

Differences that do not count. Entity-type words and abbreviations — "corporation," "Corp.," "Inc.," "Limited," "Ltd.," "LLC," and the rest — are not taken into account. Changing only the designator never distinguishes a name.

Prohibited content. A name may not falsely state or imply affiliation with a government agency, or imply the LLC is organized for a purpose the law does not permit.

Consent and court orders. A non-distinguishable name may still be allowed if the existing entity consents in writing and, in most cases, agrees to change its own name — or on a court judgment establishing your right to the name.

Reserving a name. Idaho allows reservations under § 30-21-303: $20 for 120 days (four months) through SOSBiz, or $40 on paper with the $20 manual-processing charge. A reservation is optional, does not establish an LLC, and is unnecessary if you are ready to file now.

What the search can't tell you

If the name looks available

File a Certificate of Organization with the Secretary of State through SOSBiz, or on the official paper form.

Ongoing: the annual report.

FAQ

Is the Idaho LLC name search free? Yes. The SOSBiz Business Search is free and requires no login. You only need an SOSBiz account when you file a document.

How much does it cost to form an Idaho LLC? The Certificate of Organization fee is $100 when you file through SOSBiz, or $120 on the paper form because of Idaho's $20 manual-processing charge.

Can I reserve an LLC name in Idaho? Yes. A reservation under Idaho Code § 30-21-303 holds a name for 120 days. It costs $20 through SOSBiz, or $40 on the paper application.

Does Idaho charge for the annual report? No — the fee is $0. It is still required every year by the end of your anniversary month, and failing to file can lead to administrative dissolution after a 60-day cure notice.

A dissolved company has the name I want. Can I use it? Possibly. Under § 30-21-301, a name stops blocking new filings once its owner has been administratively dissolved for more than six months. But the old owner can reinstate within ten years and use the name again.

Sources

Run the check now

Use the workflow tool below — it is pre-set to Idaho and builds your printable checklist with the official links.

Name-Check Workflow Tool

Pick your state, choose your entity type, and type the name you want. The tool builds your step-by-step checklist — the official search, the trademark check, the domain check, and your filing options. It runs entirely in your browser; nothing you type is sent anywhere.