LLC service ratings · South Dakota
3 Best LLC Services in South Dakota (2026)
1. South Dakota Registered Agent.co: best for a South Dakota LLC that will not expand
$199 to form, $99 a year for the agent, state fee extra
South Dakota Registered Agent.co is rated first: $199 to form, state fee on top, then $99 a year for the agent.
The plan lists an in-state street address as the registered office and scans papers served there into your account.
The annual report sits outside its published prices; you file it with South Dakota yourself every year.
Over three years it sums lower than Mainstay Filing, and cost is one of our two heaviest criteria.
What you get
- Articles prepared and filed
- A year of registered agent service at the start
Pros
- $99 per year to keep the agent
- Registered agent service for year one is included
- $199 service fee and the filing fee
Trade-offs
- The annual report is not on its price list
- EIN application billed at $99
2. Mainstay Filing: best for formation, agent and annual report on a single line
$199 a year plus the state fee, $349 due at checkout
Mainstay Filing is rated second: the South Dakota formation, the registered agent and the annual report are bundled into $199 a year.
Mainstay files the annual report at each renewal. The state's line is $55 every year, due due during the entity's anniversary month, with $50 added if late, and Mainstay passes that fee on at cost.
South Dakota Registered Agent.co is $200 cheaper on the three-year sum, and that lowers Mainstay Filing's cost rating.
What you get
- LLC formation filed on your behalf
- Registered agent service for the whole year
- Annual report prepared and filed
- EIN application
Pros
- South Dakota's fee goes through at cost
- EIN application is in the package
- One $199 yearly line that includes the annual report
- $199 on renewal with no extras
Trade-offs
- Agent renews $100 a year above South Dakota Registered Agent.co
3. SD Registered Agent.org: best for staying local in South Dakota
$199 to form, $99 a year for the agent, state fee extra
SD Registered Agent.org is rated third: $199 to form, state fee on top, then $99 a year for the agent.
The plan lists an in-state street address as the registered office and scans papers served there into your account.
The annual report sits outside its published prices; you file it with South Dakota yourself every year.
Nothing in the published amounts or features separates South Dakota Registered Agent.co from SD Registered Agent.org; take either.
What you get
- Articles prepared and filed
- A year of registered agent service at the start
Pros
- The first registered agent year is covered
- Then $99 yearly for the agent
- Formation line of $199, plus the state's fee
Trade-offs
- The annual report is not on its price list
- EIN application billed at $99
The 3 ratings summarized
| Line | Service | Rating | Service fee | Year two | Best for | Open |
|---|---|---|---|---|---|---|
| 1 | South Dakota Registered Agent.co | 9.4 | $199 | $99/yr | A South Dakota-only LLC counting every dollar | Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy. |
| 2 | Mainstay Filing | 9.1 | $199 | $199/yr | Formation, agent and annual report on one line | Visit Mainstay FilingPartner link. We may earn money if you buy. |
| 3 | SD Registered Agent.org | 8.9 | $199 | $99/yr | A South Dakota-only LLC counting every dollar | Visit SD Registered Agent.orgPartner link. We may earn money if you buy. |
South Dakota LLC service amounts for 2026: year one, renewal and three-year sum
| Service | Year one | Year two | Year three | Three-year sum | Annual report filed by them |
|---|---|---|---|---|---|
| South Dakota Registered Agent.co | $199 | $99 | $99 | $397 | No |
| Mainstay Filing | $199 | $199 | $199 | $597 | Yes |
| SD Registered Agent.org | $199 | $99 | $99 | $397 | No |
What decided the order
Weights: 27% cost over years one to three, 27% inclusions per price, 46% shared by renewal price and terms, fit with state rules and price clarity. Cost over years one to three decided South Dakota.
South Dakota Registered Agent.co sums to $397 across three years, $200 below Mainstay Filing. Mainstay would also file the annual report, but an owner can file it directly for the state fee alone, so the lower amount decided the rating.
Each criterion and its weight is listed on How we rank.
South Dakota LLC formation: official amount and form
Filing the Articles of Organization costs $150, paid to the South Dakota Secretary of State. Each service here passes that amount through at cost, added to its own.
State processing time: Paper 1 to 3 business days; online processed immediately.
Ongoing items for a South Dakota LLC
Plan on the annual report every year; the date is due during the entity's anniversary month. State amount: $55. Late: $50 extra. Every LLC must name a registered agent with an in-state street address.
South Dakota LLC service: your questions
What are the total costs to form an LLC in South Dakota?
$150 to the state plus $199 to the service.
What is the formation document called?
It is the Articles of Organization, lodged with the South Dakota Secretary of State.
How long does South Dakota take to process a new LLC?
The filing office reports: Paper 1 to 3 business days; online processed immediately.
Is a registered agent a requirement for a South Dakota LLC?
Yes. South Dakota wants a registered agent on file at all times, with a physical street address in the state.
Which filings recur each year for a South Dakota LLC?
One line item: the annual report, every year, due due during the entity's anniversary month, fee $55.
Is the EIN application a separate charge?
Mainstay Filing includes it in the yearly price. South Dakota Registered Agent.co and SD Registered Agent.org charge $99 separately. At the IRS the EIN itself costs nothing.
Which LLC service holds the top rating in South Dakota?
South Dakota Registered Agent.co, as $199 plus the South Dakota filing fee, first-year registered agent service included, then $99 a year.
Source lines
- South Dakota Secretary of State, Business Services / Corporations Division (ledger date August 2026)
- South Dakota Secretary of State, Business Services / Corporations Division (ledger date August 2026)
- South Dakota yearly filing: Annual report: fee and how, official source (ledger date October 2026)
- South Dakota report due date (ledger date August 2026)
- SDCL 47-34A-203 (ledger date August 2026)
- South Dakota formation fee: Filing fee, official source (ledger date October 2026)
- South Dakota formation fee: Filing fee, official source (ledger date October 2026)
- South Dakota registered agent statute (ledger date October 2026)
- Processing, official source (ledger date October 2026)
- South Dakota Registered Agent.co, pricing and service pages: amounts read November 12, 2026
- Mainstay Filing, South Dakota service page: amounts read November 12, 2026
- SD Registered Agent.org, pricing and service pages: amounts read November 12, 2026