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Open it up · South Dakota

3 Best Foreign Registration Services in South Dakota (2026): What Is Inside Each

Opened up for 2026, the foreign registration services in South Dakota rank SD Registered Agent.org ($199), Mainstay Filing ($199) and South Dakota Registered Agent.co ($199), best on top. Inside the cost: $750 goes to South Dakota, and three years of service add $397 to $497.
Unpacked by the LLC Unpacked editorial team

Four things inside

State fee to register
$750
Certificate from home?
Yes
Once registered
$55, annual report
Top of the stack
SD Registered Agent.org, Mainstay Filing then South Dakota Registered Agent.co

Our South Dakota picks, opened up

Curious about the order? The method is here.
Top of the stack

1. SD Registered Agent.org: best for registering in a single place

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

What puts SD Registered Agent.org first: it charges $199 with first-year agent service inside, then $99 annually.

Cost decides it: the three-year total here is under Mainstay Filing's.

Inside the price

  • Foreign filing handled
  • A first year of agent service

Inside, the good

  • A first year of agent service is inside
  • Agent renews at $99
  • $199 plus the state fee

Inside, the catch

  • Nothing outside this state
All fifty states

2. Mainstay Filing: best for registering in many states

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

What puts Mainstay Filing second: the fee is $199 on top of South Dakota's own, the registered agent is waived at first, and it settles at $149 a year.

A $100 three-year gap to SD Registered Agent.org explains the lower spot.

Year one of the registered agent is inside the price; afterward it is $149 annually.

Inside the price

  • Out-of-state registration filed
  • Registered agent, not charged in year one
  • One fee, any state

Inside, the good

  • The price does not change by state
  • $199 to file
  • The first agent year is inside

Inside, the catch

  • SD Registered Agent.org renews its agent $50 lower
South Dakota only

3. South Dakota Registered Agent.co: best for one added state, no more

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

South Dakota Registered Agent.co sits third because it charges $199 with first-year agent service inside, then $99 annually.

Its prices match SD Registered Agent.org exactly, so the order between them is close.

Inside the price

  • Foreign filing handled
  • A first year of agent service

Inside, the good

  • Agent renews at $99
  • A first year of agent service is inside
  • $199 plus the state fee

Inside, the catch

  • Nothing outside this state

Inside each price

#PickOpening priceRenewalTotal, 3 yearsCovers
1SD Registered Agent.org$199$99/yr$397foreign filing handled; A first year of agent serviceLook inside SD Registered Agent.orgPartner link. We may earn money if you buy.
2Mainstay Filing$199$149/yr$497Out-of-state registration filed; registered agent, not charged in year one; one fee, any stateLook inside Mainstay FilingPartner link. We may earn money if you buy.
3South Dakota Registered Agent.co$199$99/yr$397foreign filing handled; A first year of agent serviceLook inside South Dakota Registered Agent.coPartner link. We may earn money if you buy.
Service fees only, from company prices read November 13, 2026. State fees are the same whichever pick you open.

Layer by layer

Does my LLC from another state have to register?

The order matters: the South Dakota Secretary of State gets the registration first, and the LLC starts doing business in South Dakota afterward.

peek at sdlegislature.gov, confirmed October 2026

How much does registration cost?

The state charges $750, and a service adds $199.

Three years of state fees, registration included, stack up to $860. peek at sdsos.gov, confirmed October 2026

Which form is inside the filing, and where does it go?

You open one form, the Application for Certificate of Authority, Foreign Limited Liability Company, and send it to the South Dakota Secretary of State.

Pack in certificate of Existence.

What is due after the LLC registers?

Next in the box: the annual report, at $55.

The state frames the deadline as 1st of the anniversary month.

What put number one on top?

SD Registered Agent.org is strongest on total across three years, a layer worth 34% of the score.

Two layers carry most of the weight, total across three years (34%) and what is inside the price (29%).

SD Registered Agent.org stacks up to $397 over three years, $100 under Mainstay Filing.

How we open it up

What South Dakota requires to register

PartWhat is insidePeek at source
Registration fee$750peek at sdsos.gov, confirmed October 2026
Certificate from homeYespeek at sdlegislature.gov, confirmed October 2026
Annual report$55peek at sdlegislature.gov, confirmed October 2026
What the state collects in three years$860The rows above, stacked
Last row = filing fee + two later reports + minimum tax, if the state has one. Variable costs are described in the text, not added.

More boxes to open

Does the home state need its own agent?

Expect to appoint one in each state. A company that operates nationwide, Mainstay Filing for instance, can fill both roles.

What do the picks cost over three years?

Opened up over three years: SD Registered Agent.org at $397, Mainstay Filing at $497, South Dakota Registered Agent.co at $397, with state fees on top.

Are the fees official?

The state-side figures were taken from South Dakota's own publications, and the service prices from the price page each company posts. Dates for both appear on this page.

Do I have to use a service?

No. Owners can file with the state directly. A service saves time and can act as agent, but nothing makes you hire one.

Will a service file the registration for me?

Each company here handles the filing itself. What differs between them is only the service fee, since the state charges the same.

What is the best foreign registration service for South Dakota?

SD Registered Agent.org, because three years of its service fees come to $397. Then Mainstay Filing and South Dakota Registered Agent.co.

What the page rests on

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