How to Name Your South Dakota LLC

Filing fee: $150 (online) / $165 (paper)

Processing time: Typically 3–5 business days (online)

State agency: South Dakota Secretary of State

Annual report due: No annual report required for LLCs

State tax rate: No state corporate income tax; no state personal income tax

To name your South Dakota LLC, your name must include an LLC designator, be distinguishable from every other business entity on file with the South Dakota Secretary of State, and avoid restricted words. South Dakota's naming rules are straightforward compared to many states — there are no additional state-specific restrictions beyond these core requirements.

South Dakota LLC naming requirements

Every South Dakota LLC name must end with a designator that signals its legal structure. Acceptable designators are: "Limited Liability Company," "Limited Liability Co.," "LLC," or "L.L.C." You can also use "Limited Company," "LC," or "L.C." Omitting the designator entirely will get your Articles of Organization rejected.

Beyond the designator, your name must be distinguishable from every other business entity already on file with the Secretary of State. Minor tweaks — swapping punctuation, replacing a numeral with a spelled-out number, or adding a common word — generally won't be enough if the overall impression of the name is the same as an existing one.

South Dakota doesn't layer on extra naming restrictions the way some states do, but that doesn't mean anything goes. Certain words — like "bank," "insurance," or "university" — require additional state approval or a licensed professional to be involved before you can use them. If your name implies a regulated activity, check with the relevant state agency before filing.

South Dakota business entity search

Before you file, check whether your name is available using the South Dakota Secretary of State's free online Business Name Availability search tool. It searches the state's business entity database and tells you whether a proposed name conflicts with an existing registration.

For a broader search — including viewing entity status, filing history, and registered agent information — use the Business Filing Search tool on the same portal. Results show the business name, entity type, business ID, filing date, and current status, which helps you spot names that are close to yours even if they aren't an exact match.

Both tools are free and available directly through the Secretary of State's website. Running both searches before you file is worth the few minutes it takes — finding a conflict after submission means starting the process over.

Trademarks and service marks

A name that clears the Secretary of State's database can still infringe on a registered trademark. State availability and trademark rights are separate — the state won't flag a trademark conflict when it approves your filing.

Search state-registered trademarks using the South Dakota Secretary of State's free Trademark Search tool. This covers marks registered under South Dakota law, including trademarks, emblems, and similar registrations filed with the state.

Federal trademark rights can block your use of a name even if it's clear in South Dakota's records. Search the USPTO's Trademark Electronic Search System (TESS) for existing federal registrations and pending applications that might conflict with your proposed name. If you find a close match, talk to a legal professional before filing.

South Dakota DBA (fictitious name)

South Dakota allows your LLC to do business under a name that's different from its legal name. This is called a DBA — "doing business as" — or a fictitious business name. It's useful if you want a customer-facing brand name that doesn't include your full legal LLC name.

In South Dakota, DBA registration is handled at the county level, not through the Secretary of State. You'll file with the register of deeds in the county where your business operates. Requirements and fees vary by county, so check with your local register of deeds office for the specifics.

How to reserve your LLC name

If you've found a name you want but aren't ready to file your Articles of Organization yet, you can reserve it. South Dakota lets you hold a name for 120 days by filing an Application for Reservation of Name with the Secretary of State. The filing fee is $25.

Before submitting the reservation, run the name through the Secretary of State's Business Name Availability tool to confirm it's open. The reservation form is available on the Secretary of State's Limited Liability Companies forms page. The statutory authority for name reservations is SDCL 47-34A-106.

Registering your name with the Secretary of State

Your LLC name is officially registered when you file your Articles of Organization with the South Dakota Secretary of State. The name you include in that filing becomes your legal business name on record. There's no separate name registration step — the formation filing handles it.

Before you file, confirm the name is available, includes an acceptable LLC designator, and doesn't conflict with any trademarks. Getting those three things right before submission means your filing goes through without delays.