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Q&A · South Dakota

3 Best Foreign Registration Services in South Dakota (2026) for You

Who should you hire in South Dakota for foreign registration services in 2026: we say SD Registered Agent.org ($199), South Dakota Registered Agent.co ($199) and Mainstay Filing ($199), ranked best first. State fee: $750. Service fees over three years: $397 to $497.
By the LLC Answered editorial team

The brief reply

Short reply
Price to register
$750
Proof from home?
It is required
Once registered
$55, annual report
Hire in this order
SD Registered Agent.org, South Dakota Registered Agent.co then Mainstay Filing

Our South Dakota picks, best first

The scoring is explained on this page.

#1 Hire first

1. SD Registered Agent.org: best for a low yearly agent fee

$199 plus the state fee; then $99 a year

SD Registered Agent.org comes first, as $199 above the state fee at the start, and $99 yearly after that.

Three years cost less here than at Mainstay Filing, and cost counts most.

What is bundled

  • State registration done
  • First-year agent

Pluses

  • No agent charge for year one
  • Low $99 renewal
  • $199 to register

Downsides

  • Home state needs a separate agent
Visit SD Registered Agent.org site Partner link. We may earn money if you buy.
#2 For South Dakota

2. South Dakota Registered Agent.co: best for a second in-state filer

$199 plus the state fee; then $99 a year

South Dakota Registered Agent.co comes next since $199 above the state fee at the start, and $99 yearly after that.

Its prices match SD Registered Agent.org exactly, so either works.

What is bundled

  • State registration done
  • First-year agent

Pluses

  • Low $99 renewal
  • No agent charge for year one
  • $199 to register

Downsides

  • Home state needs a separate agent
Visit South Dakota Registered Agent.co site Partner link. We may earn money if you buy.
#3 Coverage everywhere

3. Mainstay Filing: best for companies that keep growing

$199 plus the state fee; then $149 a year

In third spot, Mainstay Filing, as it asks $199 plus state fees and waives the registered agent charge for the first year.

Three years here run $100 above SD Registered Agent.org.

Year one carries no registered agent fee; after that it is $149 a year.

What is bundled

  • Application prepared and sent
  • Registered agent, covered the first year
  • One service fee for all fifty states

Pluses

  • Service fee $199
  • Agent service is free for the first year
  • Fifty states covered

Downsides

  • Agent renews at $149, $50 over SD Registered Agent.org
Visit Mainstay Filing site Partner link. We may earn money if you buy.

Numbers at a glance

#CompanyFirst yearRenewalThree-year costPrice buys
1 SD Registered Agent.org $199$99/yr$397state registration done; First-year agent Visit SD Registered Agent.org site Partner link. We may earn money if you buy.
2 South Dakota Registered Agent.co $199$99/yr$397state registration done; First-year agent Visit South Dakota Registered Agent.co site Partner link. We may earn money if you buy.
3 Mainstay Filing $199$149/yr$497application prepared and sent; registered agent, covered the first year; one service fee for all fifty states Visit Mainstay Filing site Partner link. We may earn money if you buy.

Read November 13, 2026 from company pricing; three years = year one plus two renewals.

Straight replies

When does an LLC from elsewhere have to register?

Before it starts doing business in South Dakota, an LLC formed elsewhere registers with the South Dakota Secretary of State.

sdlegislature.gov, last confirmed October 2026, official site

What will registration set me back?

Registering yourself costs $750; a service lifts that by $199.

By year three the state has collected $860. sdsos.gov, last confirmed October 2026, official site

What registers the LLC?

You file the Application for Certificate of Authority, Foreign Limited Liability Company, and the South Dakota Secretary of State receives it.

Attach certificate of Existence.

Is there a recurring filing?

Annual report: $55.

The schedule says 1st of the anniversary month.

Why this order?

SD Registered Agent.org leads on three-year price, a 36% test.

We weigh three-year price first and paperwork covered second, then three smaller tests.

Three years with SD Registered Agent.org cost $397, which is $100 less than Mainstay Filing.

See the scoring

South Dakota: the requirements, cited

QuestionAmount or ruleProof
Registration fee $750sdsos.gov, last confirmed October 2026, official site
Certificate from home state It is requiredsdlegislature.gov, last confirmed October 2026, official site
Annual report $55sdlegislature.gov, last confirmed October 2026, official site
State fees, first three years $860Total of the fees above

The bottom line adds up the filing fee, the reports for years two and three and the minimum tax if there is one. A cost with no set price, like a newspaper notice, is left out of the sum.

A few more

Is one agent enough for both states?

Yes. The home state keeps its own agent rule, and Mainstay Filing can serve both states from one account.

After three years, what has each cost?

Three-year costs are SD Registered Agent.org, $397; South Dakota Registered Agent.co, $397; Mainstay Filing, $497, and state fees are separate.

How do you know these fees?

South Dakota publications for the state's fees, company price pages for the rest, with dates shown on this page.

Does the law require a service?

Not at all. Owners can file with the state directly; a service is there to save you the work and to act as agent.

Is filing part of the service?

Yes, filing is part of what each of these companies sells, and the state fee is a constant.

Which one do you pick in South Dakota?

SD Registered Agent.org first: registering costs $199 over the state fee, agent covered in year one, then $99 a year. South Dakota Registered Agent.co and Mainstay Filing follow.

Next stop

Sources, prices and dates

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