How to Start a Business in Idaho (2026): Steps, Fees and Permits

To start a business in Idaho, register your entity or business name with the Idaho Secretary of State on SOSBiz ($100 for an LLC or corporation filed online), get an EIN, and, if you’ll have employees, make retail sales or offer lodging, complete Idaho’s single IBRS form to register with the State Tax Commission, Industrial Commission and Department of Labor. Idaho is unusually low-maintenance afterward: there is no fee to file the annual report, and the state does not issue a general business license.

Sole proprietors who don’t use their full name in the business name register an assumed business name for $25 online. Fees below are as of October 2026.

Updated October 2026.

Best Business Formation Services in Idaho (2026)

If you’d rather not handle forming a business in Idaho yourself, these are the services we recommend, in order. The table compares price and what’s included.

1. Mainstay Filing

Mainstay Filing is our top pick in Idaho. It costs $199/year + state fee at cost and covers lLC formation filing, registered agent for the year, EIN application, annual report preparation and filing. The price stays the same every year, with no add-on menu.

2. ID Registered Agent.org

ID Registered Agent.org is a Idaho registered agent service at $99/year. It provides $99 per year, flat; in-state street address for the registered office; legal documents served on the company are scanned and sent to the owner online. It’s a fit if you only need a registered agent rather than full formation help.

3. Idaho Registered Agent.co

Idaho Registered Agent.co is a Idaho registered agent service at $99/year. It provides in-state street address for the registered office; legal documents served on the company are scanned and sent to the owner online. It’s a fit if you only need a registered agent rather than full formation help.

What you’ll pay to start a business in Idaho

Paper filings carry a $20 manual processing fee on top of the base fee, so filing on SOSBiz is cheaper as well as faster.

Who has to register a business in Idaho?

According to the state’s official small-business portal, all Idaho businesses, including home-based ones, register their name and entity type with the Secretary of State before doing business. The one exception is a sole proprietor who uses their full name (first and last, plus middle initial if the name is common) as part of the business name. A sole proprietor using only a first or last name must register.

You must be 18 or older to register a business, and registrations, including names and addresses, are public records.

Which business structure should you choose?

• Sole proprietorship: one owner, no entity filing; register an assumed business name unless your full name is in it.
• Partnership: two or more owners. Idaho partnerships register both an assumed business name and a Statement of Partnership Authority with the Secretary of State.
• LLC: $100 online and liability protection for members. Single-member LLCs report income on the owner’s individual return by default, and multi-member LLCs file like partnerships.
• Corporation: also $100 online; better for issuing stock, with corporate income tax unless you elect S corporation status with the IRS.

For most small Idaho businesses the LLC is the practical default. Our Idaho LLC guide explains the Certificate of Organization in detail.

Choosing an Idaho business name

Search the SOSBiz business search for conflicts. An LLC name must include “limited liability company,” “limited company” or an abbreviation such as “LLC” or “L.L.C.,” and a corporation needs “corporation,” “incorporated,” “company” or an abbreviation.

To hold a name, an Application for Reservation of Legal Entity Name reserves it for four months for $20 online. Our Idaho business name search guide has tips for the search.

The Namechk business name generator helps if you’re still brainstorming, and Namechk checks the domain and social handles in one search.

What an assumed business name does and doesn’t do

Idaho’s state portal is direct about the limits of a DBA: registering only a business name does not create a legal entity, is not a business license, offers no liability protection, and does not stop an LLC or corporation from using the name. Before 1998, names were registered with county recorders; if you bought an older business, confirm the name has been re-registered with the Secretary of State.

Appointing a registered agent in Idaho

Every Idaho LLC and corporation names a registered agent on its formation filing. The agent needs an Idaho physical address where legal papers can be delivered during business hours. The Secretary of State notes two practical points: commercial registered agent services usually charge a fee and must be arranged before you file, and an assumed business name cannot serve as a registered agent.

You can serve as your own agent if you’re an Idaho resident with a physical Idaho address (no P.O. boxes or private mailboxes), though that address becomes public. Changing your agent later is free on SOSBiz, or $20 on paper. Mainstay Filing includes a registered agent for the first year with its formation service. Our Idaho registered agent guide explains the requirements.

Filing with the Idaho Secretary of State

1. Go to SOSBiz and create an account.
2. Select Certificate of Organization (LLC) or Articles of Incorporation (corporation).
3. Enter the business name, registered agent, mailing address and governors or incorporators.
4. Pay the $100 base fee online. If you mail a paper form instead, add the $20 manual processing fee; forms sent without it are rejected.

The Secretary of State posts its current processing timeline on SOSBiz; at the time of writing, filings were being processed about 3 to 5 days after submission. Check the processed-through dates before you plan an opening date around approval.

Then adopt an operating agreement or bylaws. Idaho doesn’t collect them, but they settle ownership and decision-making. For a full cost breakdown, see Mainstay’s Idaho LLC cost guide.

Getting your EIN

Apply free on the IRS website. You’ll need it for the IBRS form, payroll and your business bank account.

Companies created in the United States no longer file federal BOI reports; FinCEN’s final rule took effect August 14, 2026.

Registering for Idaho taxes with one form

Idaho combines several state registrations into Form IBRS. If your business will have employees, make retail sales or provide lodging, the IBRS registers you with:

• The Idaho State Tax Commission: seller’s permit for sales tax and income tax withholding.
• The Idaho Industrial Commission: workers’ compensation.
• The Idaho Department of Labor: unemployment insurance.

Complete it after registering with the Secretary of State. If you won’t have employees, make retail sales or operate lodging, the state says not to complete the form.

Beyond the state sales tax, some Idaho resort cities levy a local option sales tax (the state lists 23 resort communities), and auditorium districts in areas such as Boise, Idaho Falls, Pocatello/Chubbuck and Nampa collect their own local sales tax. Idaho businesses may also owe personal property tax on equipment even when they owe no income tax.

Do you need a business license in Idaho?

Idaho does not have a state business license. Business licenses are issued by city clerk’s offices, and many cities don’t require them. Contact your city clerk about a business license or home occupation permit.

Regulated occupations are a separate matter. Contractors, cosmetologists, real estate agents, healthcare providers and others need licenses from the relevant Idaho board, and food businesses need approval from their local public health district.

Bank account, insurance and website

Open a business bank account with your filed certificate or articles and your EIN. Separate accounts protect the LLC’s liability shield and make sales tax and income tax filings simpler.

If you have employees, workers’ compensation is handled through the Industrial Commission registration on the IBRS. Most businesses also buy general liability insurance, and service providers often add professional liability. Then secure a domain and publish a basic website.

What do Idaho businesses file each year?

• An annual report with the Secretary of State on SOSBiz, due by the last day of your formation anniversary month. There is no charge to file it online; paper reports are accepted only in person in Boise with a $20 manual processing fee. An LLC that doesn’t file can be administratively dissolved. Assumed business names do not file annual reports.
• Sales tax, withholding and unemployment returns on the schedules assigned through your IBRS registrations.
• Personal property tax declarations with your county, if you own business equipment.
• Local license renewals, if your city requires a license.

Be wary of mailers asking for money to file your annual report. The state’s business portal warns that this is a scam and that the Idaho Attorney General and Secretary of State are aware of it.

FAQs

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