How to Form an LLC in South Dakota
The full process to form a South Dakota LLC — name, registered agent, Articles of Organization, EIN, operating agreement, taxes, and the ongoing report. File directly with the state; you don't need a middleman.
Check your business name is available
Search the South Dakota business database for your exact name. It must be distinguishable from existing entities and usually must include "LLC" or "Limited Liability Company".
Appoint a registered agent
South Dakota requires a registered agent with a physical in-state street address, available during business hours. You can serve as your own agent, or use a service (~$100–$150/year) to keep your address private.
File the Articles of Organization
File online with the South Dakota filing office. The fee is about $150 and processing typically takes immediate online ($165 by paper). Do not use a third-party "filing mill" — file directly with the state.
Get an EIN from the IRS
Free, online, a few minutes. You'll need it for a business bank account, taxes, and hiring. Single-member LLCs still typically get one to avoid using an SSN.
Write an operating agreement
Even a single-member LLC should have one — it documents ownership, how the business is run, and reinforces the liability shield. It's an internal document; you keep it, you don't file it.
Register for South Dakota taxes
South Dakota has a sales/use tax and has no individual income tax. Register with the state tax agency for whatever applies before you collect tax or run payroll.
Calendar the ongoing report
South Dakota requires a annual report of about $50. Miss it and the state can dissolve your LLC.
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Build my planFrequently asked
How much does an LLC cost in South Dakota?
The state filing fee is about $150. Ongoing: a annual report of ~$50, plus a registered agent if you hire one (~$100–$150/year). An EIN is free.
How long does it take to form an LLC in South Dakota?
Standard processing is immediate online ($165 by paper). Expedited options are usually available for an extra fee.
Can I be my own registered agent in South Dakota?
Yes, if you have a physical street address in South Dakota (not a PO box) and are generally available during business hours to accept legal mail. Many owners still use a service to keep their home address off the public record.
Do I need an operating agreement in South Dakota?
South Dakota may not legally require one, but you should have one anyway — banks and the IRS treat it as evidence your LLC is separate from you, and it prevents disputes if you add owners later.
What's the difference between an LLC and a sole proprietorship in South Dakota?
A sole proprietorship needs no filing — you just start working — but your personal assets are exposed if the business is sued or owes money. An LLC costs about $150 to form and adds a liability shield between the business and your personal finances.
Official sources
- South Dakota — form your LLC
- South Dakota — tax registration
- South Dakota — annual / periodic report
- IRS — apply for an EIN (free)
Fees and timelines are commonly-cited figures last reviewed 2025-06 and can change — always confirm on the official site. This is educational information, not legal or tax advice.