3 Best LLC Services in South Dakota (2026): Your Questions Answered
Wondering about LLC formation services in South Dakota, for 2026 our order is SD Registered Agent.org ($199), Mainstay Filing ($199) and South Dakota Registered Agent.co ($199). Every option pays South Dakota $150 to file, then charges $397 to $597 for three years of service.
Answered by the Ask About LLC editorial team ·
The short answers
What does the state charge?
$150, one time
Every year after
$55 each year
Registered agent
Yes, name one
Who to ask
SD Registered Agent.org, Mainstay Filing then South Dakota Registered Agent.co
Our South Dakota answer, best first
The order follows our five questions: three-year cost first, then how much the price covers.
1Our first answer
1. SD Registered Agent.org: best for companies that stay local
$199 plus the state fee, then $99 a year
Why SD Registered Agent.org at the top? With a $99 renewal, three years total $397.
For a company that stays put, the lower three-year price than Mainstay Filing earns it the top spot.
Leave room in your calendar for the annual report, because the price does not cover it.
Prices as of November 13, 2026. The state's own fees are in the checklist below.
Questions owners ask
How much money do I need to start?
The state charges $150, and a service that files for you in year one adds $199.
State fees for years one through three come to $260. sdlegislature.gov, read in October 2026 for this answer
Which form do I file, and where does it go?
The paper that starts the company is the Articles of Organization, and it is submitted to the South Dakota Secretary of State.
Processing time, per the state: Paper 1 to 3 business days; online processed immediately. sdlegislature.gov, read in October 2026 for this answer
Do I have to name a registered agent?
Every LLC must name a registered agent with an in-state street address.
A commercial registered agent listed with the state, a noncommercial agent (an individual or entity with a South Dakota address), or the title of an office in the company.
The last row is arithmetic, not a state figure: filing fee, plus the reports due in years two and three, plus a minimum tax where one applies. Open-ended costs stay out.
Still wondering?
How long does the state take?
Paper 1 to 3 business days; online processed immediately.
Who applies for the EIN?
With Mainstay Filing it costs nothing extra. SD Registered Agent.org charges $99, South Dakota Registered Agent.co charges $99.
Is there a late fee?
Expect a $50 late fee.
What do the picks cost over three years?
SD Registered Agent.org comes to $397; Mainstay Filing comes to $597; South Dakota Registered Agent.co comes to $397, with state fees on top.
Are the fees official?
State fees come from South Dakota's official documents, and service fees come from each company's own pricing page. Both carry dates on this page.
Who should I ask first about a LLC service in South Dakota?
SD Registered Agent.org, because forming costs $199, the agent is covered in year one, then $99 a year. After that, Mainstay Filing and South Dakota Registered Agent.co.
Sources for this answer
Our answer on South Dakota Secretary of State rests on sdsos.gov, a page we confirmed August 2026 and still point you to
Our answer on South Dakota Secretary of State rests on sosenterprise.sd.gov, a page we confirmed August 2026 and still point you to
Our answer on South Dakota yearly filing: Annual rests on sdlegislature.gov, a page we confirmed October 2026 and still point you to
Our answer on South Dakota report due date rests on sdlegislature.gov, a page we confirmed August 2026 and still point you to
Our answer on SDCL 47-34A-203 rests on sdlegislature.gov, a page we confirmed August 2026 and still point you to
Our answer on South Dakota formation fee: Filing rests on sdsos.gov, a page we confirmed October 2026 and still point you to
Our answer on South Dakota formation fee: Filing rests on sdlegislature.gov, a page we confirmed October 2026 and still point you to
Our answer on South Dakota registered agent statute rests on sdlegislature.gov, a page we confirmed October 2026 and still point you to
Our answer on Processing, official source rests on sdsos.gov, a page we confirmed October 2026 and still point you to
SD Registered Agent.org pricing page, read November 13, 2026
Mainstay Filing South Dakota service page, read November 13, 2026
South Dakota Registered Agent.co pricing page, read November 13, 2026