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Quick answer · South Dakota

3 Best Foreign Registration Services in South Dakota (2026), Ranked

In South Dakota for 2026, rank foreign registration services Mainstay Filing ($199), SD Registered Agent.org ($199) and South Dakota Registered Agent.co ($199). State fee: $750. Services over three years: $397 to $497.

LLC Q and A editorial team ·

At a glance

State registration fee
$750
Certificate required?
Yes
After registering
$55, annual report
Pick
Mainstay Filing, SD Registered Agent.org then South Dakota Registered Agent.co

Best in South Dakota, in order

Prices come from each company's own page. See the method.
1#1 pick

1. Mainstay Filing: best for registering in several states

$199 plus state fee, then $149/yr

Mainstay Filing ranks first since $199 above the state fee registers you, the registered agent is free in year one and $149 a year after.

Not the lowest bill: SD Registered Agent.org is $100 less over three years, in South Dakota only.

No registered agent fee in year one; $149 a year from year two.

Price covers

  • Out-of-state registration filed
  • Registered agent, free first year
  • Same price in any state

For

  • Ready for state number three
  • $199 to file
  • First agent year covered

Against

  • SD Registered Agent.org renews its agent $50 lower
Open Mainstay FilingPartner link. We may earn money if you buy.
2South Dakota only

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

$199 plus state fee, then $99/yr

Why SD Registered Agent.org is second: registration is $199 over the state fee, agent covered in year one, then $99 a year.

Price covers

  • Foreign filing handled
  • First-year agent included

For

  • Agent renews at $99
  • No agent charge in year one
  • Service fee $199

Against

  • Nothing outside this state
Open SD Registered Agent.orgPartner link. We may earn money if you buy.
3South Dakota only

3. South Dakota Registered Agent.co: best for one more state only

$199 plus state fee, then $99/yr

Why South Dakota Registered Agent.co is third: registration is $199 over the state fee, agent covered in year one, then $99 a year.

It charges exactly what SD Registered Agent.org charges.

Price covers

  • Foreign filing handled
  • First-year agent included

For

  • Agent renews at $99
  • Service fee $199
  • No agent charge in year one

Against

  • Nothing outside this state
Open South Dakota Registered Agent.coPartner link. We may earn money if you buy.

Comparison

#CompanyFirst yearRenewal3-year costCovers
1Mainstay Filing$199$149/yr$497Out-of-state registration filed; registered agent, free first year; same price in any stateOpen Mainstay FilingPartner link. We may earn money if you buy.
2SD Registered Agent.org$199$99/yr$397foreign filing handled; First-year agent includedOpen SD Registered Agent.orgPartner link. We may earn money if you buy.
3South Dakota Registered Agent.co$199$99/yr$397foreign filing handled; First-year agent includedOpen South Dakota Registered Agent.coPartner link. We may earn money if you buy.
Service fees only, from company price pages read November 13, 2026. State fees are identical for every pick.

Questions and replies

Must my LLC register here?

Before it does business in South Dakota, with the South Dakota Secretary of State.

sdlegislature.gov (October 2026) is the source of record

What does registering cost?

$750 to the state, plus $199 for a service.

Three-year state total, registration included: $860. sdsos.gov (October 2026) is the source of record

Which form, filed where?

Lodge the Application for Certificate of Authority, Foreign Limited Liability Company at the South Dakota Secretary of State; one filing registers the LLC.

Attach certificate of Existence.

Any recurring filing?

The annual report: $55.

Deadline per the state: 1st of the anniversary month.

Why this order?

Winning criterion for Mainstay Filing: chores removed from your list, weighted 26%.

Five criteria: three-year price (36%), chores removed from your list (26%), price shown up front (15%), year-two bill (12%) and states served (11%).

Two states in play, so a provider for all states outranks SD Registered Agent.org.

Method

What South Dakota requires of a foreign LLC

RequirementDetailSource
Fee to register$750sdsos.gov (October 2026) is the source of record
Home-state certificateYessdlegislature.gov (October 2026) is the source of record
Annual report$55sdlegislature.gov (October 2026) is the source of record
Three-year state total$860Sum of the rows above
To verify the total: filing fee, two later reports, minimum tax if one applies. Costs without a set amount are excluded.

More replies

Does the home state still need an agent?

Yes, in most cases. A company active in every state, such as Mainstay Filing, can cover home and this state together.

Three-year cost of each?

Mainstay Filing will run $497, SD Registered Agent.org will run $397, South Dakota Registered Agent.co will run $397, with state fees on top.

Are the fees official?

State fees cite their official page; service prices come from the company's own site.

Do I have to hire one?

No. Owners can file directly. A service saves time and can act as agent.

Can someone register the LLC for me?

Yes. Filing is part of each company's service on this page.

Which foreign registration service should I use in South Dakota?

Rank Mainstay Filing ahead of SD Registered Agent.org and South Dakota Registered Agent.co.

Sources

  1. Reference line for South Dakota Secretary of State, drawn from sdsos.gov and confirmed August 2026, as noted by our editors
  2. Reference line for South Dakota Secretary of State, drawn from sosenterprise.sd.gov and confirmed August 2026, as noted by our editors
  3. Reference line for South Dakota yearly filing: Annual, drawn from sdlegislature.gov and confirmed October 2026, as noted by our editors
  4. Reference line for South Dakota report due date, drawn from sdlegislature.gov and confirmed August 2026, as noted by our editors
  5. Reference line for SDCL 47-34A-203, drawn from sdlegislature.gov and confirmed August 2026, as noted by our editors
  6. Reference line for South Dakota formation fee: Filing, drawn from sdsos.gov and confirmed October 2026, as noted by our editors
  7. Reference line for South Dakota formation fee: Filing, drawn from sdlegislature.gov and confirmed October 2026, as noted by our editors
  8. Reference line for South Dakota registered agent statute, drawn from sdlegislature.gov and confirmed October 2026, as noted by our editors
  9. Reference line for South Dakota Secretary of State, drawn from sdsos.gov and confirmed October 2026, as noted by our editors
  10. Reference line for Foreign LLC application for Certificate, drawn from sdsos.gov and confirmed October 2026, as noted by our editors
  11. Reference line for SDCL 47-34A-1003, transacting business, drawn from sdlegislature.gov and confirmed October 2026, as noted by our editors
  12. Reference line for SDCL 47-34A-1008, effect of not, drawn from sdlegislature.gov and confirmed October 2026, as noted by our editors
  13. Reference line for SDCL 47-34A-1001 to 47-34A-1009, foreign, drawn from sdlegislature.gov and confirmed November 2026, as noted by our editors
  14. Mainstay Filing South Dakota service page, read November 13, 2026
  15. SD Registered Agent.org pricing page, read November 13, 2026
  16. South Dakota Registered Agent.co pricing page, read November 13, 2026