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LLC Straight Talk What it costs, what you have to file, who's worth paying.

Straight talk · South Dakota

3 Best Foreign Registration Services in South Dakota (2026), No Fluff

If you need foreign registration services in South Dakota in 2026, here's the order we'd go in: Mainstay Filing ($199), SD Registered Agent.org ($199) and South Dakota Registered Agent.co ($199). Every option pays South Dakota $750, then services run $397 to $497 over three years.
Straight from the LLC Straight Talk editorial team

The short of it

The short of it
State fee to register
$750
Bring a home-state certificate?
Yes, attach it
Afterward
$55, annual report
Who we'd use
Mainstay Filing, SD Registered Agent.org then South Dakota Registered Agent.co

Who we'd use in South Dakota

Prices come from each company's own page. Here's how we judge.

#1 Who we'd call first

1. Mainstay Filing: best for registering in several states

Service $199 plus $750 to the state; agent renewal $149

There's one fee, $199, whatever state you're registering in, and the registered agent is waived for the first year. That's why Mainstay Filing is first.

Here's the catch: SD Registered Agent.org costs $100 less over three years, but it only works in South Dakota.

You don't pay for the registered agent the first year. From year two, it's $149 annually wherever you registered.

What you get

  • Your registration filed for you
  • Registered agent, waived for the first year
  • A flat fee in every state

Pluses

  • $199 to file
  • No registered agent fee in year one
  • Same fee in every state

What's not

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

2. SD Registered Agent.org: best for adding this state and no others

Service $199 plus $750 to the state; agent renewal $99

$199 files the registration, and from year two the agent's $99. That puts SD Registered Agent.org second.

What you get

  • South Dakota registration filing
  • The first agent year's on them

Pluses

  • $199 to register
  • Agent renews at $99
  • A free agent year at the start

What's not

  • Nothing outside this state
Check SD Registered Agent.org Partner link. We may earn money if you buy.
#3 South Dakota only

3. South Dakota Registered Agent.co: best for another in-state choice

Service $199 plus $750 to the state; agent renewal $99

$199 files the registration, and from year two the agent's $99. That puts South Dakota Registered Agent.co third.

It charges what SD Registered Agent.org charges.

What you get

  • South Dakota registration filing
  • The first agent year's on them

Pluses

  • $199 to register
  • A free agent year at the start
  • Agent renews at $99

What's not

  • Nothing outside this state
Check South Dakota Registered Agent.co Partner link. We may earn money if you buy.

The numbers

#CompanyYear oneThenThree-year totalWhat you get
1 Mainstay Filing $199$149/yr$497your registration filed for you; registered agent, waived for the first year; A flat fee in every state Check Mainstay Filing Partner link. We may earn money if you buy.
2 SD Registered Agent.org $199$99/yr$397South Dakota registration filing; The first agent year's on them Check SD Registered Agent.org Partner link. We may earn money if you buy.
3 South Dakota Registered Agent.co $199$99/yr$397South Dakota registration filing; The first agent year's on them Check South Dakota Registered Agent.co Partner link. We may earn money if you buy.

Service fees only, from each company's prices on November 13, 2026. State fees are the same whoever you pick.

The questions that matter

Does my LLC have to register here?

Registration has to come before the business does in South Dakota.

go check sdlegislature.gov, last confirmed October 2026

How much does registering run?

$750 goes to the state. A service is $199 more.

Over three years the state's fees reach $860, counting any recurring report. go check sdsos.gov, last confirmed October 2026

What registers the LLC?

You file the Application for Certificate of Authority, Foreign Limited Liability Company with the South Dakota Secretary of State, and that single filing registers the LLC.

Attach certificate of Existence.

Is there a filing that repeats?

Expect the annual report: $55.

Straight from the state, the deadline is 1st of the anniversary month.

Why this order?

On jobs the price actually covers (30% of the score), Mainstay Filing wins.

We run five tests: money out the door in three years (35%), jobs the price actually covers (30%), no hunting for the price (14%), no surprise at renewal (11%) and where it works (10%).

With two states in play, a provider that covers every state beat SD Registered Agent.org.

The five tests

What South Dakota requires to register

RequirementDetailCheck it
Fee to register $750go check sdsos.gov, last confirmed October 2026
Good standing certificate Yes, attach itgo check sdlegislature.gov, last confirmed October 2026
Annual report $55go check sdlegislature.gov, last confirmed October 2026
State fees, years one to three $860The rows above, added up

The last row is our math, not the state's: filing fee, plus the reports in years two and three, plus any minimum tax. If a cost has no fixed amount, like a newspaper notice, it's explained above and left out.

More questions

Do I still need an agent at home?

Each state sets its own rule, so keep an agent at home too. A provider that works in every state, like Mainstay Filing, can handle both.

What do the picks cost over three years?

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

Where do these numbers come from?

Official South Dakota sources back the state side, and posted prices back the service side.

Is a service required?

Not required. The state takes filings from owners.

Can I pay somebody to register the LLC?

All of them do, so the service fee's the only difference.

Who should I use for a foreign registration service in South Dakota?

Mainstay Filing is first: South Dakota's fee plus $199 gets you registered, and nobody bills you for the registered agent until year two. Then comes SD Registered Agent.org and South Dakota Registered Agent.co.

What's next

Sources, so you can check

  1. Where South Dakota Secretary of State comes from: sdsos.gov, confirmed August 2026, and you can go look yourself
  2. Where South Dakota Secretary of State comes from: sosenterprise.sd.gov, confirmed August 2026, and you can go look yourself
  3. Where South Dakota yearly filing: Annual comes from: sdlegislature.gov, confirmed October 2026, and you can go look yourself
  4. Where South Dakota report due date comes from: sdlegislature.gov, confirmed August 2026, and you can go look yourself
  5. Where SDCL 47-34A-203 comes from: sdlegislature.gov, confirmed August 2026, and you can go look yourself
  6. Where South Dakota formation fee: Filing comes from: sdsos.gov, confirmed October 2026, and you can go look yourself
  7. Where South Dakota formation fee: Filing comes from: sdlegislature.gov, confirmed October 2026, and you can go look yourself
  8. Where South Dakota registered agent statute comes from: sdlegislature.gov, confirmed October 2026, and you can go look yourself
  9. Where South Dakota Secretary of State comes from: sdsos.gov, confirmed October 2026, and you can go look yourself
  10. Where Foreign LLC application for Certificate comes from: sdsos.gov, confirmed October 2026, and you can go look yourself
  11. Where SDCL 47-34A-1003, transacting business comes from: sdlegislature.gov, confirmed October 2026, and you can go look yourself
  12. Where SDCL 47-34A-1008, effect of not comes from: sdlegislature.gov, confirmed October 2026, and you can go look yourself
  13. Where SDCL 47-34A-1001 to 47-34A-1009, foreign comes from: sdlegislature.gov, confirmed November 2026, and you can go look yourself
  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