EIN Registration

Idaho Business Search

Look up any Idaho company in the state's official business search.

Find any Idaho LLC or corporation, check whether it is active, and see where to get proof of good standing. The state's search is also known as SOSBiz.

Last updated November 5, 2026

Look up a Idaho company

This is Idaho’s own search, loaded from the state’s website. Any security check it shows comes from the state. It finds the company, not usually its EIN. Open it in a new tab.

What the Idaho business search shows

The Idaho SOSBiz business search finds a company by business name. It finds a company by business name. Use it to confirm a company exists and is active, not to get its federal number.

The Secretary of State's FAQ says the EIN comes from the IRS.

The Idaho file number

The Idaho Secretary of State gives every company a file number when it is formed. It identifies the company in state records, and it is not the company’s EIN.

Check if an Idaho LLC is active

Search the company in the Idaho business search and open its record. The status tells you whether the state counts the company as active. Words such as dissolved, revoked, forfeited, inactive or delinquent mean it is not in good standing, usually because an annual filing or fee was missed, and the company may need to be reinstated before it can do business there.

To prove a company is in good standing to a bank, a lender or another state, order a Certificate of Existence from the Idaho Secretary of State. Our LLC status check reads the status from public data where a state publishes it.

Good to know in Idaho

  • Idaho Business Registration is one application shared by three agencies: it opens the State Tax Commission's seller's permit and withholding account, the Idaho Department of Labor's unemployment insurance account, and the Industrial Commission permits an employer needs. The form also asks an LLC how it chose to be taxed (single member, partnership, corporation or S corporation), the same classification it made with the IRS.
  • The Idaho State Tax Commission's permit guidance says a single-member LLC must have an EIN, even though the IRS does not require one for a disregarded single-member LLC with no employees and no excise tax liability. The IRS notes that such an LLC can still get an EIN when it needs one for a bank account or for state tax purposes, and Idaho's registration form asks for it.
  • Idaho's local sales taxes are local option taxes adopted by voters in a short list of resort cities, on top of the state sales tax. Some of those cities apply theirs only to lodging, liquor by the drink and restaurant food, and questions about a city's tax go to the city rather than the State Tax Commission.

Found your Idaho company but it has no EIN yet? We prepare and file the application and email you the number.

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Questions

How do I search for a business in Idaho?

Use the Idaho SOSBiz business search, which finds a company by business name. Search by the main words of the name, without LLC or Inc, so small differences do not hide the company.

Does the Idaho business search show a company's EIN?

Generally not. The EIN comes from the IRS, and Idaho's business records are kept for the state's own purposes. A Form W-9 from the company is the reliable way to get it.

How do I check if an Idaho LLC is active?

Search the company by name and open its record. The status shows whether Idaho counts it as active. Words like dissolved, revoked, forfeited, inactive or delinquent mean it is not in good standing, often because an annual filing or fee was missed.

How do I get proof that an Idaho company is in good standing?

Order a Certificate of Existence from the Idaho Secretary of State. Banks, lenders and other states ask for it as proof the company exists and is current.

What is an Idaho file number?

It is the number the Idaho Secretary of State gives a company when it is formed, and it identifies the company in state records. It is not the company's EIN, which comes from the IRS.

More for Idaho companies

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Answer a few questions in about 5 minutes. Our specialists prepare your IRS Form SS-4, file it, personally handle any rejection or name conflict along the way, and get your EIN to you, typically within 2 to 4 business days, or about 11 when the IRS requires the application by fax.

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You can also apply for an EIN directly with the IRS at irs.gov at no cost.