Idaho DBA: How to File an Assumed Business Name With the Secretary of State

If you do business under any name other than your own legal name, or the registered name of your LLC or corporation, Idaho expects you to file an assumed business name. Most people call this a DBA (short for doing business as). In Idaho the filing goes to the Secretary of State, not your county, and it is one of the least expensive filings you will make. This guide covers the process, the fees, and the follow-up duties, using the figures and the confirmed statute references.

This guide is informational content, not legal or tax advice. Fees and rules change, so confirm current requirements with the agency named in each section, and talk to a qualified Idaho attorney or CPA before you make decisions about your business structure, name, or taxes.

Skip the paperwork

Let a pro file your Idaho business for you

Filing in Idaho means state registration, an EIN, and a registered agent. These two services handle all of it, and here's our honest take on when to use each.

Top pick · Best value

Northwest Registered Agent

$39 + state fee

Keeps your home address private
Free registered agent for year one
Real US-based support, no upsell maze

Best for: most Idaho founders who want privacy and value without the markup.

Form my Idaho LLC →

BetterLegal

Fastest setup · premium

Business filed in about 2 business days
Bundles your EIN + operating agreement
One streamlined, hands-off checkout

Best for: founders who need it done fast with everything bundled.

Set up with BetterLegal →

Affiliate partners: we may earn a commission at no extra cost to you. Pricing is set by each provider and may change.

What an Idaho DBA Actually Is

Idaho uses the term assumed business name (ABN) for what most people search for as an Idaho DBA, fictitious business name, or trade name registration. Under Idaho Code 30-21-805, the ABN is filed with the Idaho Secretary of State. If a website tells you to file with your county, it is describing the wrong office for an Idaho assumed business name.

The certificate creates no separate entity. Under Idaho Code 30-21-807(c), it gives you no ownership of the name and no exclusive rights to it. A DBA lets you use a name in public. It does not stop another business from using the same or a similar name, and it is not a substitute for a trademark.

Who Needs to File

Sole proprietors, LLCs, and corporations all use the same certificate. You need one whenever the public-facing name differs from the legal name of the person or entity behind the business. Common examples include:

A sole proprietor who sells bookkeeping services as Treeline Bookkeeping.
Summit Ridge Holdings LLC, which runs a coffee cart under the name Ridge Roast.
A corporation that launches a second consumer brand under a different name.

Each name needs its own certificate. An LLC that runs three brands files three certificates.

Search the Name Before You File

Start with the ABN search on SOSBiz at sosbiz.idaho.gov/search/business. Search the exact name you want, plus the variations a customer might type: with and without the word The, with and without an entity word such as LLC, and common misspellings. If an identical name is already on record, pick another name. If you find a close match, ask the Secretary of State before you file rather than assuming the difference is enough. Save a dated screenshot of your results so you have a record of what you checked.

What the Certificate Requires

Under Idaho Code 30-21-806, the certificate lists:

The assumed business name.
The true name and business address of each person with a financial or control interest in the business.
The type of business.

The true name is the legal name of each person, not a DBA. If an entity holds an interest in the business, confirm with the Secretary of State how that entity should be listed before you file. Gather the information first, because the form asks for it all at once.

Fees

These are the Secretary of State amounts from the fee table as of 2026:

Filing	Online	Paper
Certificate of Assumed Business Name	$25	$45 (includes a $20 manual data entry surcharge)
Amendment	$10	$30
Renewal	None. The ABN stays in effect until canceled.	None. The ABN stays in effect until canceled.
Cancellation	Confirm on the fee table	Confirm on the fee table

Online filing saves you $20 per certificate compared with paper. Check the Secretary of State business forms page before you pay, because the fee table is the source of record.

Step-by-Step Filing

Choose and search the name. Use the SOSBiz ABN search described above.
Gather the information. You need the legal names and business addresses of each person with a financial or control interest, the assumed business name, and the type of business.
File online or on paper. Online filing runs through SOSBiz at sosbiz.idaho.gov/forms/business/ and costs $25. Paper costs $45. Most people should file online.
Pay and submit. Keep the confirmation and a complete copy of what you filed.
Check processing time. The Secretary of State says business filings are generally processed in about 7 to 10 days from the filing date. Current estimates appear on the SOSBiz Processed Through Date page, so check it before you need the certificate.
Start using the name. Banks commonly ask for a copy of the certificate before they open an account under the name, so have it ready.

The Secretary of State also offers expedited handling. Idaho Code 30-21-214 sets a $40 surcharge for evidence of filing within 8 working hours, and a $100 surcharge for same day service on filings submitted before 1:00 p.m. Mountain time. Those surcharges are written for entity filings, so confirm with the Secretary of State whether they apply to an assumed business name before you pay for expedited handling.

After You File: What You Must Maintain

An ABN has no renewal. It stays in effect until you cancel it under Idaho Code 30-21-807(b), so the state will not send you an annual reminder for this filing. Two duties remain:

Amendments. File an amendment within 90 days of a change in the people with a financial or control interest, or in the addresses listed on the certificate (Idaho Code 30-21-808). The amendment fee is $10 online or $30 on paper.
Cancellation. When you stop using the name, file a certificate of cancellation (Idaho Code 30-21-809). Confirm the cancellation fee on the Secretary of State fee table.

Keep this separate from your LLC annual report, because the ABN does not replace it. An Idaho LLC must file an annual report every year, due before the end of the month in which its Certificate of Organization became effective, beginning one year after formation. Idaho Code 30-21-214(b)(7) lists the annual report fee as no fee. Put both deadlines on your calendar.

Licenses, Permits, and Taxes After the DBA

Filing an ABN is a registration, not a license. Business.Idaho.gov puts it plainly: Idaho does not have a state business license. Registering your business is a registration, not a license. The rules beyond that depend on where you operate and what you sell:

Counties. Counties do not issue a general business license.
Cities. Cities differ. Some cities require a general business license or permit, and others license only specific activities. Ask your city clerk which applies to your location, or use the Business Wizard at business.idaho.gov to generate a checklist for your activity.
Contractors. Idaho has no statewide general contractor license. Contractors register with the Idaho Contractors Board at DOPL.
Short-term rentals. Since July 1, 2026, no city or county may require a license, fee, permit, or registration for a short-term rental under HB 583. State and local lodging taxes still apply, so a rental operating under a DBA still has those tax duties.
Sales tax. The state sales tax rate is 6%. Idaho has no local sales tax outside voter-approved resort cities. If your sales are taxable, register for a sales tax permit through the Idaho State Tax Commission at tax.idaho.gov/ibr.
Income tax. Idaho has a flat 5.3% income tax for 2025. A default LLC is a pass-through entity, so its members report Idaho income on their personal returns.

The certificate creates no separate entity, but whether a new name affects your federal or state tax registrations is a question for your CPA and the Idaho State Tax Commission.

Common Mistakes

Filing with the county. Idaho assumed business names are filed with the Secretary of State.
Skipping the name search. Finding out after you have printed signs that someone already holds the name is an expensive lesson.
Assuming the DBA protects the name. Under 30-21-807(c) it gives you no exclusive rights. Use a trademark search if the brand matters to you.
Missing the 90-day amendment window. A new partner or a new office address triggers the duty whether or not you remember it.
Treating the DBA as a license. The certificate registers a name. It does not authorize you to operate. Check city and profession-specific requirements separately.
Leaving an old DBA active. Because there is no renewal, a forgotten name stays on the record until you file a cancellation.

When to Get Professional Help

The certificate itself is a short form. Get advice from a qualified Idaho attorney or CPA if you have several owners with different ownership percentages, plan to change ownership often, want to protect a brand, operate in a regulated profession, or are weighing a new entity structure. The Idaho Small Business Development Center can help with planning questions, and the SBA Boise district office covers Idaho business assistance.

Official Resources

Idaho Secretary of State: sos.idaho.gov
ABN search on SOSBiz: sosbiz.idaho.gov/search/business
Online filing on SOSBiz: sosbiz.idaho.gov/forms/business/
Business forms and fee table: sos.idaho.gov/business-forms/
Idaho State Tax Commission: tax.idaho.gov
Sales tax permit registration: tax.idaho.gov/ibr
Business.Idaho.gov and the Business Wizard: business.idaho.gov

This article is informational, not legal or tax advice. Confirm fees and deadlines with the Idaho Secretary of State and the other agencies named above before you file, and consult a qualified Idaho attorney or CPA for your specific situation.