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Biz Formation Academy

A plain textbook on LLC paperwork, one state per chapter.

Unit 3 · South Dakota

Foreign LLC Registration Chapter, South Dakota (2026): 5 Sections and the 3 Best Services

In 2026 the services this chapter recommends for registering an LLC formed elsewhere in South Dakota are Mainstay Filing ($199), SD Registered Agent.org ($199) and South Dakota Registered Agent.co ($199), best first. A foreign LLC pays South Dakota $750 to register; the 5 sections show how.
Written by the Biz Formation Academy editorial board

Essential facts

Registration fee $750 Reference: sdsos.gov, consulted October 2026
Home certificate Required Part of the filing package
Annual report $55 Annual report
State cost, years 1 to 3 $860 Service fees excluded
Sections in this chapter 5 Taken one at a time

After this chapter you will understand

  • Whether South Dakota registration applies to an LLC
  • The official form and fee
  • The cost of staying registered
  • Which services are recommended and why

If you want someone else to file

Ranked by the grading page: three-year cost (34%), paperwork completed (30%), second-year price, fit with South Dakota rules and clarity of the price list.

1. Mainstay Filing: best for LLCs that keep expanding

Top recommendation
$199 to register, $149 per year afterward

In South Dakota, Mainstay Filing heads the list: $199 above the state fee in any state; the registered agent costs nothing the first year, then $149 yearly.

Set against SD Registered Agent.org, the three-year premium is $100, which the 30% weight on paperwork covered outweighs.

Year two brings a charge for the agent, $149 a year, and it is the same in every state.

Price covers

  • The registration is prepared and submitted
  • The registered agent carries no charge in year one
  • Any state at one price

Advantages

  • The same fee in every state
  • The first agent year is included
  • $199 plus the state fee

Limitations

  • Renewal $50 above SD Registered Agent.org's
Visit Mainstay Filing Partner link. We may earn money if you buy.

2. SD Registered Agent.org: best for one more state

Local option
$199 to register, $99 per year afterward

Second place is held by SD Registered Agent.org, since the registration charge is $199 plus state fees, and the first agent year is already paid.

Price covers

  • Registration filing
  • A year of agent service is built into the price

Advantages

  • $99 a year for the agent afterward
  • The first agent year is free
  • $199 plus the state fee

Limitations

  • A separate agent is required at home
Visit SD Registered Agent.org Partner link. We may earn money if you buy.

3. South Dakota Registered Agent.co: best for registering in South Dakota only

Local option
$199 to register, $99 per year afterward

Third place is held by South Dakota Registered Agent.co, since the registration charge is $199 plus state fees, and the first agent year is already paid.

Its prices equal SD Registered Agent.org's, so either serves.

Price covers

  • Registration filing
  • A year of agent service is built into the price

Advantages

  • $199 plus the state fee
  • The first agent year is free
  • $99 a year for the agent afterward

Limitations

  • A separate agent is required at home
Visit South Dakota Registered Agent.co Partner link. We may earn money if you buy.

3 services, side by side

#ServiceFirst yearFrom year twoThree-year total
1 Mainstay Filing $199$149/yr$497 Visit Mainstay Filing Partner link. We may earn money if you buy.
2 SD Registered Agent.org $199$99/yr$397 Visit SD Registered Agent.org Partner link. We may earn money if you buy.
3 South Dakota Registered Agent.co $199$99/yr$397 Visit South Dakota Registered Agent.co Partner link. We may earn money if you buy.

Company prices as listed on November 13, 2026. No row includes the $750 state fee.

How registration works in South Dakota

  1. Section 1

    When South Dakota requires registration

    South Dakota requires an out-of-state LLC to register first if it will do business here. The consequences of failing to register include: its contracts can still be enforced (SDCL 47-34A-1008(b))

    Reference: Reference: sdlegislature.gov, consulted October 2026

  2. Section 2

    Collect the document issued by the home state

    The application must include certificate of Existence.

    Leave it until the other documents are ready.

  3. Section 3

    Appoint a registered agent for South Dakota

    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 recommended reading covers this role.

    Reference: Reference: sdlegislature.gov, consulted October 2026

  4. Section 4

    Next comes the Application for Certificate of Authority, Foreign Limited Liability Company

    The form and a fee of $750 are sent together to the South Dakota Secretary of State.

    Reference: Reference: sdsos.gov, consulted October 2026

  5. Section 5

    Keep the registration in force

    What follows registration is the annual report, priced at $55, with timing of 1st of the anniversary month.

What each section costs in South Dakota

EntryGoes toSum
Section on registration Paid to the state$750
Annual report Paid to the state$55
Filing service (optional) The service company$199 in year one
Three-year state total Paid to the state$860

Anything paid to South Dakota is an official fee that can be verified in the bibliography. The three-year row combines the filing, two later reports and a minimum tax where one exists; service prices are not part of it.

Why Mainstay Filing is first

Chapters the price completes accounts for 30% of the ranking, and led on it in South Dakota.

The LLC was formed in one state and works in another, so a provider serving both earned first place.

South Dakota questions

How much must an LLC formed elsewhere pay to register with South Dakota?

$750 at the filing office. Service fees: $199.

Which form do I file to register?

The Application for Certificate of Authority, Foreign Limited Liability Company is the form needed, and it goes 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?

The annual report keeps the registration in force, at $55.

Which service should handle the registration?

Mainstay Filing, because a charge of $199 plus South Dakota's fee covers the filing and the first year of the registered agent. After it come SD Registered Agent.org and South Dakota Registered Agent.co.

More chapters

Bibliography and primary texts

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