3 Best LLC Services in South Dakota (2026): Prices Tracked
Our 2026 watchlist puts South Dakota Registered Agent.co ($199), Mainstay Filing ($199) and SD Registered Agent.org ($199) at the top for LLC formation services in South Dakota, listed in that order. Expect $397 to $597 in service fees by year three. The $150 owed to South Dakota does not depend on the provider.
Tracked by the Filing Price Watch editorial team
Ordered by:
Order = 37% cost, 29% filings covered, and three lighter measures (details)
Snapshot
Government fee to file$150sdlegislature.gov (pulled October 2026, noted here)
Opening prices$199Provider charges only
Three-year spend$397 to $597Three years of provider charges
What the state collects in 3 years$260Does not vary by provider
Cost lines meet inDoes not happenOrder holds through year 10
Ranked picks
Services are ordered by value, and every price comes from a company page. The $150 state fee is kept outside the prices.
#Ordered byPrice in year 1Price at renewalThree-year spend
1
Top pick
1. South Dakota Registered Agent.co: best for companies that never leave the state
$199 for formation, $99 for the agent after that
Price in year 1$199
Price after year 1$99/yr
Three-year spend$397
South Dakota Registered Agent.co takes first place in South Dakota: $199 buys the formation and the agent costs $99 a year afterward.
Its three-year total sits under Mainstay Filing's, which wins it the top spot.
The annual report stays on your to-do list.
Price covers
Articles of organization, filed
A year of agent service to begin with
Holds up
$99 a year after that
$199 for the filing
Year-one agent covered
Weak spots
The annual report is not priced in
It charges $99 for the EIN application
2
Fifty states
2. Mainstay Filing: best for never touching the annual report
$199 a year, plus $150 paid to the state
Price in year 1$199
Price after year 1$199/yr
Three-year spend$597
Spot 2 goes to Mainstay Filing: for $199 a year the filing, the registered agent and the annual report are all covered, and year two costs $199.
Over three years it runs $200 higher than South Dakota Registered Agent.co.
The annual report is handled each time, with South Dakota's $55 passed along at cost.
Price covers
Formation handled for you
Registered agent for the full year
Annual report, filed when it is due
EIN application, prepared for you
Nothing added to state charges
Holds up
EIN application included
$199 a year includes filing and agent and report
Year two costs $199
Weak spots
After year one the gap to South Dakota Registered Agent.co is $100
3
South Dakota only
3. SD Registered Agent.org: best for owners who file their own reports
$199 for formation, $99 for the agent after that
Price in year 1$199
Price after year 1$99/yr
Three-year spend$397
SD Registered Agent.org takes spot 3 because $199 buys the formation and the agent costs $99 a year afterward.
The annual report stays on your to-do list.
South Dakota Registered Agent.co lists exactly the same prices.
The state's share is worked out from three pieces: what it charges to file, what it charges for the next two reports, and any minimum tax. Anything without a fixed price, newspaper notices for instance, is left out of that figure.
How first place was won
The 37% measure tracked three-year cost separated the top two.
South Dakota Registered Agent.co wins the cost measure at $397 for three years, $200 under what Mainstay Filing charges.
Put the EIN application into the sum and the totals cross at year 2, when Mainstay Filing passes South Dakota Registered Agent.co.
South Dakota LLC filing fee and requirements, as written by the state
You send the Articles of Organization and $150 to the South Dakota Secretary of State. Every LLC must name a registered agent with an in-state street address.
From the source: sdlegislature.gov (pulled October 2026, noted here)
State fees and nothing else
Do it all yourself and you owe only the state: $260 over three years. The services above add $397 to $597 for the paperwork and the agent.
About these prices
How much do LLC formation services cost in South Dakota?
Year one is $199 among these services, and South Dakota adds $150 to file.
What do these services cost over three years?
$397 to $597 across these services, not counting state fees.
What does South Dakota charge to file an LLC?
$150; the filing is the Articles of Organization.
What does South Dakota charge every year once the LLC exists?
What repeats is the annual report at $55 annually (due during the entity's anniversary month).
Does the price include the EIN application?
South Dakota Registered Agent.co adds $99, Mainstay Filing includes it and SD Registered Agent.org adds $99.
In what year does one service become pricier than another?
The order stays the same for ten years.
Which LLC formation service is the best value in South Dakota?
South Dakota Registered Agent.co wins on tracked three-year cost, followed by Mainstay Filing and SD Registered Agent.org.