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LLC 101 Guide

Section 3 · South Dakota

Foreign LLC Registration in South Dakota (2026): 5 Tasks and the 3 Best Services

For registering an out-of-state LLC in South Dakota in 2026, this unit puts SD Registered Agent.org ($199), Mainstay Filing ($199) and South Dakota Registered Agent.co ($199) at the top of the class, in that order. Do you have to register at all? Start there; 5 tasks follow, with a $750 state fee at the end.

Prepared by the LLC 101 Guide instructors

Unit overview

Cost to register
$750
Taken from sdsos.gov in October 2026
Certificate you must attach
Required
Attached to the filing
Yearly filing
$55
Annual report
What the state collects in three years
$860
Without any service fee
How many tasks
5
In order

Unit goals

  • Which LLCs must register
  • The filing, its price and its office
  • What comes after registration
  • Our recommendations, with reasons

Who we would hire in South Dakota

Five weighted criteria set the order (see how we grade), and three-year cost and assignments completed count most.

Top of the class

1. SD Registered Agent.org: best for one extra state

Top of the classService $199, renewal $99 a year

SD Registered Agent.org comes out first, and the reason is that a $199 service fee and $99 a year for the South Dakota agent after that.

Three years cost less here than at Mainstay Filing, and three-year cost is 34% of the grade.

What the price covers

  • Filing made with the state
  • One year of agent service is part of the price

What works

  • The agent renews at $99
  • $199 above the state fee
  • A year of agent service is included

What to weigh

  • South Dakota only; your home state needs its own agent
Visit SD Registered Agent.orgPartner link. We may earn money if you buy.

Top of the class

2. Mainstay Filing: best for one provider for home and away

Upkeep coveredService $199, renewal $149 a year

Mainstay Filing takes second place: registering costs $199 plus state fees, and the first year of the registered agent is free.

It runs $100 above SD Registered Agent.org over three years, and cost is 34% of the grade.

At renewal the agent becomes $149 a year, in every state.

What the price covers

  • Registration is filed for you
  • The registered agent costs nothing in year one
  • Any state, one price

What works

  • $199 plus the state fee
  • The same fee in every state
  • The agent costs nothing in year one

What to weigh

  • Agent renews at $149, $50 above SD Registered Agent.org
Visit Mainstay FilingPartner link. We may earn money if you buy.

Top of the class

3. South Dakota Registered Agent.co: best for a small agent renewal

South Dakota specialistService $199, renewal $99 a year

Third goes to South Dakota Registered Agent.co, since a $199 service fee and $99 a year for the South Dakota agent after that.

It lists the same prices as SD Registered Agent.org.

What the price covers

  • Filing made with the state
  • One year of agent service is part of the price

What works

  • $199 above the state fee
  • The agent renews at $99
  • A year of agent service is included

What to weigh

  • South Dakota only; your home state needs its own agent
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

The South Dakota picks compared

#ServiceFirst yearFrom year twoThree-year total
1SD Registered Agent.org$199$99/yr$397Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
2Mainstay Filing$199$149/yr$497Visit Mainstay FilingPartner link. We may earn money if you buy.
3South Dakota Registered Agent.co$199$99/yr$397Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
Listed prices, read November 13, 2026. Every row also owes the $750 state fee.

The unit, task by task

  1. Task 1

    When registration is required

    LLCs formed outside South Dakota file a foreign registration to transact business here. If you skip it: Its contracts can still be enforced (SDCL 47-34A-1008(b)).

    Source: Taken from sdlegislature.gov in October 2026

  2. Task 2

    Order the home-state certificate

    Get certificate of Existence.

    Order it at the end so it is fresh when you file.

  3. Task 3

    Get a registered agent with a South Dakota address

    Every LLC must name a registered agent with an in-state street address. The address has to be an actual street address or rural route box number in South Dakota, plus a South Dakota mailing address if it differs.

    The picks above supply one.

    Source: Taken from sdlegislature.gov in October 2026

  4. Task 4

    Work through the Application for Certificate of Authority, Foreign Limited Liability Company

    Fill in the Application for Certificate of Authority, Foreign Limited Liability Company, include $750, and mail or upload it to the South Dakota Secretary of State.

    Source: Taken from sdsos.gov in October 2026

  5. Task 5

    What comes after

    Next on the list is the annual report for $55, 1st of the anniversary month.

What each task costs in South Dakota

EntryGoes toAmount
The registration taskState agency$750
Annual reportState agency$55
Service, if you hire oneThe service company$199 at the start
State fees over years one to threeState agency$860
Three years of state cost equals the filing fee, plus the reports in years two and three, plus any minimum tax. The sources are listed below.

How the grades came out

pulled ahead of on course fee across three years, a criterion worth 34%.

SD Registered Agent.org wins the cost criterion with $397 over three years, against $100 more at Mainstay Filing.

South Dakota questions

What will foreign registration in South Dakota cost?

$750 to the state. Our recommended services add $199.

Which form do I file to register?

Fill in the form named in task 4 and send it to the South Dakota Secretary of State.

Do I need a certificate from my home state?

Yes: certificate of Existence.

What if the LLC does business there without registering?

Its contracts can still be enforced (SDCL 47-34A-1008(b)).

What is due after registering?

Task 5 covers it: the annual report for $55.

Which service should handle the registration?

Go with SD Registered Agent.org: $199 over the state fee to register, then $99 yearly. Then Mainstay Filing and South Dakota Registered Agent.co.

Reading list and sources

  1. Everything about South Dakota Secretary of State, Business Services / above traces to sdsos.gov, a page we reread in August 2026.
  2. Everything about South Dakota Secretary of State, Business Services / above traces to sosenterprise.sd.gov, a page we reread in August 2026.
  3. Everything about South Dakota yearly filing: Annual report: fee and above traces to sdlegislature.gov, a page we reread in October 2026.
  4. Everything about South Dakota report due date above traces to sdlegislature.gov, a page we reread in August 2026.
  5. Everything about SDCL 47-34A-203 above traces to sdlegislature.gov, a page we reread in August 2026.
  6. Everything about South Dakota formation fee: Filing fee, official source above traces to sdsos.gov, a page we reread in October 2026.
  7. Everything about South Dakota formation fee: Filing fee, official source above traces to sdlegislature.gov, a page we reread in October 2026.
  8. Everything about South Dakota registered agent statute above traces to sdlegislature.gov, a page we reread in October 2026.
  9. Everything about South Dakota Secretary of State, business services above traces to sdsos.gov, a page we reread in October 2026.
  10. Everything about Foreign LLC application for Certificate of Authority above traces to sdsos.gov, a page we reread in October 2026.
  11. Everything about SDCL 47-34A-1003, transacting business above traces to sdlegislature.gov, a page we reread in October 2026.
  12. Everything about SDCL 47-34A-1008, effect of not registering above traces to sdlegislature.gov, a page we reread in October 2026.
  13. Everything about SDCL 47-34A-1001 to 47-34A-1009, foreign limited liability companies above traces to sdlegislature.gov, a page we reread in November 2026.
  14. Figures from SD Registered Agent.org's pricing page, November 13, 2026
  15. Figures from Mainstay Filing's South Dakota service page, November 13, 2026
  16. Figures from South Dakota Registered Agent.co's pricing page, November 13, 2026