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Biz Formation Report

Rankings of registered agents, LLC formation and foreign registration services in all 50 states.

LLC formation report · South Dakota

3 Best LLC Services in South Dakota (2026)

By the Biz Formation Report editorial team

Biz Formation Report ranks LLC services in South Dakota for 2026 as Mainstay Filing ($199), South Dakota Registered Agent.co ($199) and SD Registered Agent.org ($199), in that order. Mainstay Filing earns the top grade: the formation filing, the registered agent and the annual report come to $199 a year, renewing at $199.

No.1

Our top pick in South Dakota

1. Mainstay Filing: best for formation, agent and annual report on one invoice

Score9.6out of 10
$199 a year plus the state fee, $349 due at checkout

Top grade, Mainstay Filing: a flat $199 yearly fee takes in the South Dakota formation, your registered agent and the annual report.

The renewal covers the annual report, which Mainstay files for you. South Dakota collects $55 every year, with a deadline of due during the entity's anniversary month, and a late filing adds $50; Mainstay passes the state's fee through at cost.

Over three years Mainstay costs $200 more than South Dakota Registered Agent.co; our grading treats the broader coverage as worth that.

What you get

  • The LLC formation, done for you
  • Registered agent service all year
  • The annual report prepared and filed
  • The EIN application

Good

  • A single $199 yearly price, including the annual report
  • Renewal is $199 with no add-ons
  • South Dakota's state fee is passed through at cost
  • Includes the EIN application

Weak spots

  • Its agent renews at $100 a year more than South Dakota Registered Agent.co's
Visit Mainstay FilingPartner link. We may earn money if you buy.
Read the Mainstay Filing review
No.2

Best value here

2. South Dakota Registered Agent.co: best for a South Dakota LLC that expects to stay put

Score9.4out of 10
$199 for formation, then $99 a year for the agent, plus the state fee

Second grade, South Dakota Registered Agent.co: $199 for formation on top of the state fee, then $99 a year for the agent.

The plan seats the company at an in-state street address and posts scans of papers served there to your online account.

The annual report is outside its published prices, so you submit it to South Dakota yourself every year.

What you get

  • Formation prepared and filed
  • Year-one registered agent service

Good

  • Agent renewal of $99
  • $199 service fee, state fee added
  • The first year as your registered agent is included

Weak spots

  • Does not handle the annual report
  • The EIN application costs $99 extra
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
Read the South Dakota Registered Agent.co review
No.3

Lower renewal than Mainstay

3. SD Registered Agent.org: best for local South Dakota formation

Score9.3out of 10
$199 for formation, then $99 a year for the agent, plus the state fee

Third grade, SD Registered Agent.org: $199 for formation on top of the state fee, then $99 a year for the agent.

The plan seats the company at an in-state street address and posts scans of papers served there to your online account.

The annual report is outside its published prices, so you submit it to South Dakota yourself every year.

Prices and features do not separate South Dakota Registered Agent.co from SD Registered Agent.org; either works.

What you get

  • Formation prepared and filed
  • Year-one registered agent service

Good

  • Formation costs $199 before the state fee
  • First-year registered agent service is part of the price
  • $99 annually to keep the agent

Weak spots

  • Does not handle the annual report
  • The EIN application costs $99 extra
Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
Read the SD Registered Agent.org review

Summary of the 3 grades

RankProviderGradeService feeYear twoBest fitSite
1Mainstay Filing9.6$199$199/yrFormation, agent and annual report on one invoiceVisit Mainstay FilingPartner link. We may earn money if you buy.
2South Dakota Registered Agent.co9.4$199$99/yrA South Dakota-only LLC keeping costs downVisit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
3SD Registered Agent.org9.3$199$99/yrA South Dakota-only LLC keeping costs downVisit SD Registered Agent.orgPartner link. We may earn money if you buy.

The grades are editorial: Biz Formation Report assigns every mark out of 10 using the criteria on How we rank, not customer ratings.

South Dakota LLC service prices, 2026: year one, renewal and three-year outlay

ProviderYear 1Year 2Year 3Three-year outlayAnnual report done for you
Mainstay Filing$199$199$199$597Yes
South Dakota Registered Agent.co$199$99$99$397No
SD Registered Agent.org$199$99$99$397No

All prices were taken from the companies' own websites on November 12, 2026. South Dakota's $150 filing fee is payable on top of each row and is not part of these totals.

What decided the order

Of the grade, 32% rests on three-year bill and 32% on what the money buys; renewal handling, local rules match and pricing openness share the remaining 36%. What the money buys decided South Dakota.

South Dakota requires a report every year, charging $55, plus $50 if it is late. Mainstay's price includes the filing and South Dakota Registered Agent.co's does not, which outweighed South Dakota Registered Agent.co's lower three-year cost in the coverage grade.

Every criterion and weight is listed on How we rank.

South Dakota LLC filing fee and form, from official sources

The South Dakota Secretary of State charges $150 for the Articles of Organization. Each provider here adds that fee at cost on top of its own.

Processing time at the state: Paper 1 to 3 business days; online processed immediately.

What a South Dakota LLC owes after formation

Expect the annual report every year, with a deadline of due during the entity's anniversary month. It costs $55. Late filing adds $50. Every LLC must name a registered agent with an in-state street address.

South Dakota LLC service: common questions

What does South Dakota charge to start an LLC, all in?

$150 goes to the state and $199 to the service.

Which document starts the LLC?

the South Dakota Secretary of State accepts the Articles of Organization.

What is the processing time for a South Dakota LLC filing?

According to the filing office: Paper 1 to 3 business days; online processed immediately.

Is a registered agent mandatory for a South Dakota LLC?

Yes. South Dakota requires one, with a physical street address in the state, from the day the LLC exists.

What recurring paperwork follows an LLC in South Dakota?

A single item: the annual report, filed every year (due during the entity's anniversary month) for $55.

Does the service price cover the EIN?

The Mainstay Filing yearly price covers it. South Dakota Registered Agent.co and SD Registered Agent.org list it at $99. The IRS does not charge for issuing an EIN.

What is the best LLC service in South Dakota, by our report?

Mainstay Filing: $199 a year buys the South Dakota formation, a year as your registered agent and the annual report filing, then renews at $199.

Read next

Source notes

  1. South Dakota Secretary of State, Business Services / Corporations Division (verified August 2026)
  2. South Dakota Secretary of State, Business Services / Corporations Division (verified August 2026)
  3. South Dakota yearly filing: Annual report: fee and how, official source (verified October 2026)
  4. South Dakota report due date (verified August 2026)
  5. SDCL 47-34A-203 (verified August 2026)
  6. South Dakota formation fee: Filing fee, official source (verified October 2026)
  7. South Dakota formation fee: Filing fee, official source (verified October 2026)
  8. South Dakota registered agent statute (verified October 2026)
  9. Processing, official source (verified October 2026)
  10. Pulled November 12, 2026: Mainstay Filing, South Dakota service page
  11. Pulled November 12, 2026: South Dakota Registered Agent.co, pricing and service pages
  12. Pulled November 12, 2026: SD Registered Agent.org, pricing and service pages