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Before going into the details, here is a quick checklist for registering a DBA in Montana.
| Official Term | Assumed business name [2] |
|---|---|
| Filing Agency | Montana Secretary of State, Business Services Division (statewide filing; there is no separate county DBA filing) [1] |
| Filing Method | Online through the Secretary of State Business Filing Portal at biz.sosmt.gov [8] |
| State Fee | $20 to register an assumed business name [6] |
| Processing Time | Online filings are processed quickly; optional 24-hour expedited service is $20, and 1-hour service is $100 [6] |
| Term and Renewal | Registration is effective for 5 years and can be renewed for another 5-year term; the Secretary of State notifies you at least 90 days before expiration [4] |
| Cancellation | File a cancellation of registration of an assumed business name form with the Secretary of State; there is no fee [10] |
A DBA stands for "Doing Business As." It is an alternative name your business uses instead of its registered legal name. In Montana, the official term is "assumed business name," and you register it with the Secretary of State.
Montana law defines an assumed business name as any business name other than the full, true, and correct name of a person, and the word "person" covers individuals, partnerships, corporations, limited partnerships, and limited liability companies. [2]
A DBA does not create a new legal entity. It does not change your tax status, your liability protection, or your ownership structure. It is only a name your business is authorized to operate under.
| Brand Fit | Commercial Banking | Multi-Entity Branding | Statewide Coverage |
|---|---|---|---|
| Sole proprietors operate under their personal names by default. An assumed business name lets you do business under a professional brand instead. | Montana banks generally require a registered assumed business name before opening a business account in a name other than your legal name. | One entity can run several brands or product lines under separate assumed business names without forming a new company for each. | A Montana assumed business name is filed once with the Secretary of State and is effective statewide, so there is no separate county filing to manage. |
Montana keeps the process simple. You register your assumed business name once with the Secretary of State through the online Business Filing Portal, and the registration covers the whole state. The same path applies whether you are a sole proprietor, a partnership, an LLC, or a corporation. [1]
Unlike some states, Montana does screen assumed business names. The Secretary of State may not register a name that is the same as or not distinguishable from an assumed business name, corporate name, LLC name, limited partnership name, trademark, or service mark already on file or reserved. [7]
Start by checking availability for free through the Montana Business Name Search on the Secretary of State portal. If your preferred name is too close to an existing record, the state will reject the filing, so a clear search saves time. [3]
Montana assumed business name rules are light, but a few hard limits apply.
| Your name must be distinguishable | Match identifiers to your real structure | Conflicts can block your filing |
|---|---|---|
| The Secretary of State will not register a name that is the same as or not distinguishable from a name already registered or reserved. [7] | You may not use a business name identifier, such as "LLC," "Inc.," or "Corp," that incorrectly states or implies an entity type you are not. [7] | Because Montana checks for conflicts, a name that is too close to an existing one will be refused, so search before you commit to a brand. [3] |
Run a trademark search at the U.S. Patent and Trademark Office (USPTO) as well. Registering an assumed business name in Montana gives you no federal trademark rights and does not stop a trademark holder from challenging your use of the name. [5]
You register your assumed business name with the Montana Secretary of State through the Business Filing Portal at biz.sosmt.gov. Create a user profile, then start the assumed business name application from the Forms page. [8]
Required application details come straight from Montana statute, which lists the applicant's name and address, the proposed name, and a description of the business. [9]
| Situation | Fee |
|---|---|
| Register an assumed business name | $20 [6] |
| Renew the registration (every 5 years) | $20 [6] |
| Reserve a proposed assumed business name | $10 [6] |
| Cancel the registration | No fee [6] |
| Optional 24-hour expedited processing | $20 [6] |
Online filings through the Business Filing Portal are processed quickly, and you can request 24-hour or 1-hour expedited service for an added fee if you need confirmation faster. [6]
Keep your filed registration. Banks, vendors, and payment processors will ask for proof of the assumed business name before they let you operate or accept funds under it.
A Montana assumed business name is not permanent. The registration is effective for 5 years and can be renewed for another 5-year term. The Secretary of State will notify you at least 90 days before the registration expires, and the registration will be canceled if you do not renew. [4]
A DBA and an LLC are not the same thing. This is one of the most common points of confusion for new business owners, and getting it wrong can be costly.
A DBA is only a name. It does not create a legal entity. It does not protect your personal assets. If someone sues your business, your personal finances are exposed.
Forming an LLC means you are creating a separate legal entity. That separation generally protects your personal finances, home, and savings from business debts and lawsuits.
If you are a sole proprietor who wants a business name without incorporating, an assumed business name is a fast, affordable option. If you want liability protection, you need an LLC or a corporation.
Many businesses do both: they form an LLC and then apply for a DBA to run a brand under a name different from the LLC's legal name.
| Feature | DBA (Assumed Business Name) | LLC |
|---|---|---|
| Creates a legal entity | No | Yes |
| Personal asset protection | No | Yes |
| Changes the tax treatment | No | Can elect a different tax status |
| Required to operate under a different name | Yes, if the name differs from your legal name | No, the LLC name is its legal name |
| Cost to register | $20 state fee + Swyft service fee | State filing fee + Swyft service fee |
Most Montana assumed business name problems come down to the same handful of errors. Here is what to watch out for before you file.
Montana refuses names that are not distinguishable from existing records, so an unsearched name can get your filing rejected. Check the Business Name Search first. [7]
You cannot include "LLC," "Inc.," or "Corp" in an assumed business name unless your business is actually organized that way. The identifier must match your real structure. [7]
A Montana assumed business name expires after 5 years. The state sends a notice at least 90 days out, but calendars the renewal so your registration does not lapse. [4]
An assumed business name is only a name. It does not create a legal entity and does not shield your personal finances. If you want protection, form an LLC.
State registration is not trademark clearance. A federal trademark holder could still force you to stop using the name, so run a USPTO search. [5]
Montana runs assumed business name filings through the online Business Filing Portal. Using the portal is the fastest, most reliable path to confirmation. [8]
[1] Montana Secretary of State. Business and UCC Services. Accessed on June 4, 2026.
[2] Montana Legislature. Montana Code Annotated 30-13-201, Definitions. Accessed on June 4, 2026.
[3] Montana Secretary of State. Business Name Search. Accessed on June 4, 2026.
[4] Montana Legislature. Montana Code Annotated 30-13-206, Term and Renewal of Assumed Business Name Registration. Accessed on June 4, 2026.
[5] U.S. Patent and Trademark Office (USPTO). Trademarks. Accessed on June 4, 2026.
[6] Montana Secretary of State. Business Services Filing Fees. Accessed on June 4, 2026.
[7] Montana Legislature. Montana Code Annotated 30-13-202, Registration of Assumed Business Name. Accessed on June 4, 2026.
[8] Montana Secretary of State. Business Filing Portal, Register a Business. Accessed on June 4, 2026.
[9] Montana Legislature. Montana Code Annotated 30-13-203, Application for Registration of Assumed Business Name. Accessed on June 4, 2026.
[10] Montana Legislature. Montana Code Annotated 30-13-213, Voluntary Cancellation of Registration. Accessed on June 4, 2026.
Montana Secretary of State, Business Services. Business filings, fees, and the online Business Filing Portal.
Montana Secretary of State Business Filing Portal. Register and manage your assumed business name and other filings online.
Montana Department of Revenue. State tax registration and business tax information for Montana.
IRS. Get an Employer Identification Number (EIN).
U.S. Small Business Administration, Montana District Office. SBA Montana District Office supports small businesses.
