Montana requires any business operating under a name different from its legal or registered name to file an assumed business name with the Montana Secretary of State. Unlike some states that handle this at the county level, Montana centralizes all filings through its Secretary of State portal, and the filing is open to sole proprietors, LLCs, corporations, and partnerships alike.
DBA Montana at a glance
- In Montana, a DBA is officially called an assumed business name, registered with the Montana Secretary of State, not at the county level.
- Any domestic business entity, including sole proprietors, LLCs, corporations, and partnerships, can file to operate under a name different from their legal name.
- The state filing fee is $20, paid through biz.sosmt.gov, and registration must be renewed every five years.
- A DBA does not create a new legal entity, provide liability protection, or grant trademark rights. It only lets you use a different name for business purposes.
- Before filing, search the Montana business name database to confirm your desired name is available and not confusingly similar to an existing registered name.
- A Montana DBA is separate from a business license, a trademark, and an LLC name. Mixing these up creates compliance gaps.
What is a DBA in Montana?
A DBA in Montana, officially called an assumed business name, is a registered alias that lets your business operate publicly under a name other than its legal name. Under Montana Code Annotated § 30-13-203, any person or entity using an assumed business name must register it with the Montana Secretary of State.
A Montana DBA does not create a new legal entity, does not shield you from personal liability, and does not grant trademark rights. It is simply an authorized name you can use on contracts, invoices, and marketing materials.
Who needs a Montana DBA?
If you conduct business under any name other than your legal name, you must file. There is no grace period to operate first and register later.
Entity types that can file
Montana's assumed business name requirement applies to sole proprietorships, general partnerships, corporations, LLCs, limited partnerships, limited liability partnerships, and out-of-state companies that regularly transact business in Montana under a name different from their legal name.
- Sole proprietors. Your legal business name is your own full name. Any other name you use publicly requires a registered assumed business name.
- General partnerships. The legal name is the name established in your partnership agreement. Operating under anything else triggers the filing requirement.
- LLCs and corporations. If your LLC or corporation wants to conduct business under a name other than its registered legal name, you must file a certificate with the Secretary of State under § 30-13-203.
- Foreign entities. Out-of-state businesses operating in Montana under a name different from their registered legal name must also comply.
One practical consequence: your business cannot maintain lawsuits or court actions under an unregistered DBA (§ 30-13-215, MCA). Registration protects your ability to enforce contracts and take legal action under that name.
When you don't need a DBA in Montana
A sole proprietor named Elena Vasquez who runs her practice as "Elena Vasquez Bookkeeping" does not need a DBA. That name is functionally her legal name. But if she wants to call her business "Big Sky Books," she must file.
The same logic applies to formed entities. If Montana Holdings, LLC operates as Montana Realty, a DBA is required. If it operates only as Montana Holdings, LLC with no alternate identity, no DBA is required.
The rule in plain terms: if the name on your storefront, website, invoices, or contracts matches your legal name exactly, you can skip the filing. The moment any variation appears, registration is required.
Montana DBA vs. LLC name vs. trade name vs. trademark
These four terms all involve business names but serve completely different legal purposes.
| DBA (assumed business name) | LLC name | Trade name | Federal trademark | |
|---|---|---|---|---|
| What it is | A registered alias to operate under a name other than your legal name | The official legal name of your LLC, established when you file Articles of Organization | A name used in commerce to identify a business; often used interchangeably with "DBA" | A federally registered mark giving exclusive rights to use a name or logo for specific goods or services |
| Who files it | Any sole proprietor, partnership, LLC, corporation, or foreign entity operating in Montana under a different name | The LLC's organizer, filed with the Montana Secretary of State at formation | Same as DBA | Any person or entity using a mark in commerce, filed with the USPTO |
| Where it's filed | Montana Secretary of State (biz.sosmt.gov) | Montana Secretary of State (biz.sosmt.gov) | Montana Secretary of State (biz.sosmt.gov) | U.S. Patent and Trademark Office (USPTO) |
| Cost | $20 registration; $20 renewal; $10 name reservation | Standard LLC formation fee | $20 (same assumed business name fee schedule) | $350 per class of goods or services (base fee, filed online) |
| Creates a new legal entity? | No | Yes | No | No |
| Liability protection? | No | Yes | No | No |
| Grants trademark rights? | No | No | No | Yes: exclusive nationwide rights for registered classes |
| Renewal required? | Yes: every 5 years | Yes: annual report required | Yes: same 5-year cycle | Yes: every 10 years |
"Trade name" is not a legally distinct category under Montana law. It is simply another way of describing an assumed business name.
- When a DBA is the right choice: A DBA is appropriate when you want to operate under a different name without forming a new entity—fast, inexpensive, and straightforward.
- When you need something more: If you need liability protection, forming an LLC is the mechanism that separates personal assets from business obligations. If you want to stop competitors from using a similar name nationwide, only a federal trademark provides that protection.
If you are weighing a more formal structure, see what is involved when you start an LLC in Montana before filing a DBA as a short-term solution.
How to check Montana DBA name availability
Montana law requires business names to be unique and not deceptively similar to any previously registered entities. Skipping this step is one of the most common reasons a filing gets rejected.
Step 1: Go to the Montana Secretary of State's business search portal
Montana's business entity search is at biz.sosmt.gov/search/business. The tool is free and open to the public, with no account required. The database includes domestic and foreign corporations, nonprofits, LLCs, limited partnerships, LLPs, business trusts, assumed business names, and registered trademarks. You can also use LegalZoom’s free Montana business name search tool to see if your name or a variation of it is still available for use in the state.
Step 2: Search using the "Contains" option, not "Starts With"
Always use "Contains" rather than "Starts With." Searching "Hamburger Guy" using "Starts With" would miss an existing business called The Hamburger Guy Inc.
Run your search at least two or three times: once with the full name, once with only the most distinctive word or phrase, and once with common abbreviations or alternate spellings. Use the Montana Secretary of State business entity search tool to search Montana business names and check both exact matches and similar variations.
Step 3: Understand what "distinguishable" means in practice
Montana applies a "distinguishable" standard—your name must be meaningfully different from existing registered names, not just technically different. Adding a generic descriptor, changing punctuation, or swapping a suffix may not be enough. If "Big Sky Plumbing LLC" is already registered, filing a DBA for "Big Sky Plumbing Services" would likely be rejected. Suffixes such as Corporation, Incorporated, LLC, and Ltd. cannot be used to claim distinguishability.
Step 4: Check for restricted words
Certain words require additional approval. Montana prohibits assumed business names from including terms associated with financial institutions—"bank," "banc," "banco," "banker," "trust company," "savings and loan association," "savings bank," or "credit union"—without a consent letter from the Montana Division of Banking and Financial Institutions. Names closely resembling a federal or state agency (FBI, FDA, Montana Police, Treasury) are also prohibited. Do not include a business entity suffix like LLC or Inc. unless your business is actually that entity type.
Step 5: Run a separate USPTO trademark search
A clean result on the Montana Secretary of State portal only confirms the name is available for state registration. It does not tell you whether someone has already trademarked the name federally. If you will sell beyond Montana or want nationwide protection, run a USPTO search for identical and confusingly similar marks. Discovering an infringement issue after filing, printing business cards, and launching a website is a costly problem to fix.
Step 6: Consider reserving your name
If you are not ready to file immediately, Montana allows name reservations for 120 days at a cost of $10 through the Secretary of State's portal. Name reservations cannot be renewed. Reserving your name means another business can’t register under it as long as the reservation is active.
How to file a Montana assumed business name: Step-by-step
The filing happens entirely online through biz.sosmt.gov. There is no paper form to mail, no county office to visit, and no in-person appointment required.
What you need before you file
- Your legal name. For sole proprietors, your full personal name. For formed entities, the exact registered legal name on file with the Secretary of State.
- Your entity type. Sole proprietor, general partnership, corporation, LLC, LLP, LP, or association.
- Your desired assumed business name. Exactly as you want it to appear, already confirmed available.
- Your principal business mailing address. The address the Secretary of State will use to send renewal notices.
- Applicant contact information. Must correspond exactly to the entity type you select.
- Payment method. Credit card, debit card, or e-check for the $20 filing fee.
If your entity is a partnership, also prepare the names and business mailing addresses of all partners. For corporations and limited partnerships, your entity must already be registered with the Montana Secretary of State before you can file an assumed business name under it.
Step 1: Create or log in to your Montana Secretary of State account
Go to biz.sosmt.gov. Click "Login" in the upper right corner, then enter your credentials. To create an account, click "Create an Account" and provide a name, email address, and password. The same account manages all of your Montana Secretary of State filings going forward.
Step 2: Select "Assumed Business Name" filing
Once logged in, click "Register a Business" or "Forms" on the left. The Assumed Business Name (ABN/DBA) registration will be on the top left-hand side. You are registering a name, not forming a new legal structure. Make sure you select the assumed business name form and not a formation document.
Step 3: Complete the application
Complete every field marked with a red asterisk. The application asks for:
- The assumed business name. Exactly as you want it registered. Under § 30-13-202, MCA, you cannot include a business entity identifier that incorrectly states your entity type—a sole proprietor cannot include "LLC" or "Inc." in the assumed name.
- Entity type. Check only one: Corporation, Limited Liability Company, Limited Liability Partnership, Limited Partnership, Association, or Partnership.
- Business mailing address. City, state, and zip code.
- Applicant name and address. Must correspond exactly with the entity type you select. If you check "A Corporation," you must write in the name and address of the corporation.
The applicant section is where most filers make errors. Any discrepancy between your applicant name and your legal entity's name on file can cause a rejection or require a follow-up amendment.
Step 4: Pay the filing fee and submit
Click "FILE ONLINE" and pay by credit card, debit card, or e-check. The filing fee is $20. Montana offers expedited processing for an additional fee: $20 for 24-hour processing and $100 for a one-hour turnaround. Review every field before submitting—correcting errors after filing requires a formal amendment and an additional $20 fee.
Step 5: Confirm approval and save your records
The Secretary of State will send a letter of acknowledgment once your document meets statutory requirements and has been filed. If it does not, you will receive a letter outlining deficiencies. Once approved, your assumed business name appears in the public Montana business entity database. Download and save your confirmation—you will need it when opening a business bank account, signing contracts under the assumed name, or demonstrating compliance.
Update the Secretary of State any time your business mailing address changes. A missed renewal notice due to an outdated address is one of the most preventable ways to let a registration lapse.
Montana DBA fees, processing times, and renewal
Montana keeps costs straightforward. All fees are paid through the Secretary of State's online portal. There are no county filing fees, no publication requirements, and no additional state-level costs.
Fee schedule
| Filing type | Fee |
|---|---|
| Registration of assumed business name (initial filing) | $20 |
| Renewal of registration | $20 |
| Amendment to registration | $20 |
| Name reservation (120 days) | $10 |
| Cancellation of registration | No fee |
| Expedited processing—24-hour | Additional $20 |
| Expedited processing—1-hour | Additional $100 |
Source: Montana Secretary of State Business Filing Fee Schedule (sosmt.gov/business/fees), revised March 2025.
All fees are paid by credit card, debit card, or e-check at submission. There is no option to mail a check or pay in person.
Processing times
Standard processing typically takes a few business days. If your timeline is tight—a launch date, contract signing, or bank account opening—the expedited options are worth considering.
Renewal period and how to renew
Montana assumed business names must be renewed every five years. The state sends a renewal notification no later than 90 days before expiration, and that 90-day window is your entire renewal opportunity. Under Montana Code Annotated § 30-13-206(3), if you do not file within that window, the Secretary of State will cancel the registration. There is no grace period, no warning after the window closes, and no reinstatement path. Once canceled, the name returns to the available pool.
To renew, log in to biz.sosmt.gov, locate your assumed business name record, follow the renewal prompts, and pay the $20 fee.
What happens if you miss the renewal deadline
Your registration is canceled. You lose the right to operate under that name, and an unregistered name removes your ability to maintain lawsuits or enforce contracts under it. You must re-file as a new initial registration and pay the $20 fee again, and someone else may have registered the name in the interim.
The simplest prevention: when you file or renew, calendar the expiration date and set a reminder 100 days out, just ahead of the 90-day window.
What to do after your Montana DBA is approved
Once approved, your assumed business name appears in the Montana Secretary of State's public database, giving vendors, clients, and banks a way to verify your business identity. You can then do several things to set your business up for success.
- Open a business bank account under the assumed name. Most banks require a copy of your DBA filing before opening an account under your assumed name. Using your assumed business name and EIN, set up a dedicated account to keep business and personal finances separate.
- Use the assumed name correctly on contracts. Sign contracts with both your legal name and your DBA name. Your legal name ensures the contract holds up in court; your DBA name makes the relationship between your business and the assumed name clear to the other party.
- Understand what the DBA does not change about your taxes. A DBA only changes the name of a business. It has no effect on your entity's tax status, your EIN, or your state tax registration with the Montana Department of Revenue.
- Check whether you need a Montana business license. A DBA is not a business license. Whether you need one depends on your industry and location. Check with your local city or county clerk's office and review Montana business license requirements.
How to change or cancel a Montana DBA
Business needs can evolve, and the Montana Secretary of State provides clear procedures for modifying or ending your registered assumed business name. Whether you need to update registration details or permanently close out your filing, follow the established protocols to keep your business records compliant.
How to amend a Montana assumed business name
An amendment is required any time the details on your registration no longer reflect reality—a change to your business address or the assumed name itself. The amendment application must include: the complete assumed business name prior to the amendment; the complete new assumed business name, if applicable; the name and address of the registrant, including street name and number; and if the name of any person having an interest in the business is changing, the new name of that person.
File the amendment online through the Secretary of State's portal. The fee is $20. The applicant name on the amendment must match exactly with the current registration—if it does not, you must also file an Assumed Business Name Amendment alongside your renewal. Failure to meet amendment requirements results in cancellation.
How to cancel a Montana assumed business name
If you stop using your assumed business name, you are responsible for canceling the registration. Montana does not automatically remove a name just because you stop using it. To cancel, deliver a cancellation form to the Secretary of State that includes the complete registered assumed business name and the name and business mailing address of the registrant of record. You can cancel online. There is no cancellation fee.
Save the acknowledgment letter confirming cancellation. Once canceled, the name returns to the available pool immediately—if there is any chance you might want it again, canceling means you could lose it for good.
File your Montana DBA with LegalZoom
If you would rather skip the portal navigation, LegalZoom can file a DBA in Montana on your behalf, reducing the risk of form errors, mismatched applicant names, or a rejected submission. LegalZoom has helped form over 4.8 million businesses, including DBA filings across all 50 states. You provide the information; LegalZoom handles the filing. If questions come up along the way, LegalZoom's attorney network is available to help you work through them before you commit to a name or a structure.
Montana DBA FAQs
Does a Montana DBA protect my personal information?
No. Your name and business mailing address appear in the Montana Secretary of State's public database. If separating your personal identity from your business is a priority, forming an LLC, not filing a DBA, is the mechanism for doing that.
Does an LLC have to file a tax return in Montana?
Montana LLCs are pass-through entities by default, meaning profits flow to members, who report them on personal returns. LLCs taxed as corporations must pay Montana corporate income tax. A DBA does not change any of these obligations. For specifics, contact the Montana Department of Revenue directly.
How do I set up a sole proprietorship in Montana?
Montana does not require formal state registration to operate as a sole proprietor. However, if you want to operate under any name other than your own full legal name, you must register an assumed business name. For a structure with liability protection, see what is involved when you start an LLC in Montana.
What is the registration loophole in Montana?
The "Montana registration loophole" refers to vehicle registration, not business name filings, specifically, registering vehicles through Montana LLCs to avoid sales tax and registration fees in other states. It is facing heightened scrutiny as states move to penalize taxpayers who use it. If you landed here looking for that, consult a tax attorney.
What are the downsides of using a Montana LLC?
Montana LLCs must file an annual report and pay the associated fee to remain in good standing. Members may also face self-employment taxes on their share of profits. Formation and ongoing compliance, including your operating agreement, registered agent, and annual filings, adds administrative overhead that a DBA does not. If you only need to operate under a different name without liability protection, a DBA is simpler and less expensive.
Can I have more than one DBA in Montana?
Yes. Montana law does not limit how many assumed business names a single entity can hold. Each requires a separate $20 filing and carries its own five-year renewal cycle. Track each expiration date independently to avoid an unintentional lapse.
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