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Plain and short · South Dakota

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

South Dakota, 2026: Mainstay Filing ($199), South Dakota Registered Agent.co ($199) and SD Registered Agent.org ($199), first to last, are the foreign registration services we recommend. Every option pays South Dakota $750. Three years of service run $397 to $497.
Charter Simple editors

The short version

State fee to register
$750
Home certificate?
Yes
After registering
$55, annual report
Ranked first
Mainstay Filing, South Dakota Registered Agent.co then SD Registered Agent.org

South Dakota, ranked

The order follows five checks. Three-year cost comes first, then what the price covers. See method.
1 Ranked first

1. Mainstay Filing: best for registering in many states

Register for $199. Agent renewal $149

Mainstay Filing ranks first in South Dakota. The registration price does not vary by state ($199), and the registered agent is waived for twelve months.

Choose South Dakota Registered Agent.co and save $100 across three years, if the LLC never leaves South Dakota.

From year two the registered agent renews at $149.

Includes

  • Registration, filed
  • Registered agent, no charge the first year
  • One fee for all fifty states

Good

  • No registered agent fee in year one
  • The same fee in every state
  • $199 to register

Against

  • South Dakota Registered Agent.co renews its agent $50 lower
2 South Dakota only

2. South Dakota Registered Agent.co: best for adding only this state

Register for $199. Agent renewal $99

South Dakota Registered Agent.co ranks second. $199 files the registration, and the agent renews at $99.

Includes

  • South Dakota registration filing
  • Agent for year one

Good

  • Agent renews at $99
  • $199 over the state fee
  • Year one of the agent comes with it

Against

  • Nothing outside this state
3 South Dakota only

3. SD Registered Agent.org: best for another local option

Register for $199. Agent renewal $99

SD Registered Agent.org ranks third. $199 files the registration, and the agent renews at $99.

Its prices match South Dakota Registered Agent.co exactly. The order between them is close.

Includes

  • South Dakota registration filing
  • Agent for year one

Good

  • $199 over the state fee
  • Agent renews at $99
  • Year one of the agent comes with it

Against

  • Nothing outside this state

Prices

#NameYear oneAfter year oneTotalIncludes
1 Mainstay Filing $199$149/yr$497Registration, filed; registered agent, no charge the first year; one fee for all fifty states Visit Mainstay FilingPartner link. We may earn money if you buy.
2 South Dakota Registered Agent.co $199$99/yr$397South Dakota registration filing; agent for year one Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
3 SD Registered Agent.org $199$99/yr$397South Dakota registration filing; agent for year one Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
Service fees only, read November 13, 2026. State fees are identical for every pick.

Key questions

Must my LLC register here?

An LLC formed elsewhere registers with the South Dakota Secretary of State, then begins business in South Dakota.

from sdlegislature.gov, October 2026, kept short

How much to register?

$750 to the state. $199 more if someone files for you.

By year three the state has collected $860. from sdsos.gov, October 2026, kept short

Which form, and where?

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

Include certificate of Existence.

What is due after registering?

A annual report follows. Cost: $55.

Date set by the state: 1st of the anniversary month.

What put the first pick first?

Mainstay Filing scores best on work included, which is 27% of the score.

Two checks carry most of the weight: three-year cost (38%) and work included (27%).

Two states are involved, so a provider for every state ranks above South Dakota Registered Agent.co.

Method

South Dakota registration rules, sourced

ItemRule or amountConfirm
Registration fee$750from sdsos.gov, October 2026, kept short
Home-state certificateYesfrom sdlegislature.gov, October 2026, kept short
Annual report$55from sdlegislature.gov, October 2026, kept short
State fees, three years$860Sum of the rows above
The last row adds the filing fee, the reports in years two and three, and any minimum tax. A cost with no fixed amount, such as a newspaper notice, is left out.

Questions

Do I still need an agent at home?

Yes. Each state has its own rule. Mainstay Filing can serve both from one account.

What do the picks cost over three years?

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

Where do the figures come from?

State fees come from South Dakota's official documents. Service prices come from each company's price page. Both are dated here.

Must I use a service?

No law requires a service. It is a paid convenience.

Does a service file it for me?

Yes. Every pick files it, and the state fee is the same for all.

Which ranks first in South Dakota?

Mainstay Filing, because South Dakota's fee plus $199 gets you registered, with no registered agent bill until year two. Then South Dakota Registered Agent.co and SD Registered Agent.org.

Sources

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