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Foreign registration cost calculators + South Dakota

3 Best Foreign Registration Services in South Dakota (2026): Cost Calculator

The 2026 result for South Dakota foreign registration services: Mainstay Filing ($199), SD Registered Agent.org ($199) and South Dakota Registered Agent.co ($199), ranked best value first. Registration in South Dakota is $750; the services add $397 to $497 to that over three years.
Calculated by the Formation Calc editorial team

Result order: Cost 41% plus coverage 27% plus three smaller terms (see the formula)

Calculator summary

Government fee to register$750sdsos.gov {input read October 2026, shown in full}
What year one calculates to$199Excludes state charges
Three-year outputs$397 to $497Renewals included
State fees by year three$860Independent of the service
Lines cross inNo crossoverStable for a decade

Ranked results

Reading across: year one, the price after that, then the three-year total. Add South Dakota's $750 to whichever result you pick.
1

1. Mainstay Filing: best for the same cost in each state

Leads the results
Year-1 input$199
Input for year 2 on$149/yr
Result at year 3$497
$199 for registration, $149 for the agent after that

Mainstay Filing gives the best result in South Dakota: $199 added to the state fee, the first registered agent year at zero, then $149 yearly.

SD Registered Agent.org is $100 lower at year three, but the 27% coverage term still ranks this one first.

After the free year, the agent bills $149 annually.

Inputs covered

  • The foreign registration filing
  • Registered agent free in year one
  • Good in all fifty states

Adds up well

  • Same fee wherever you register
  • The first agent year is covered
  • Service charge of $199

Adds up badly

  • $50 more each year for the agent
2

2. SD Registered Agent.org: best for adding only one state

One-state service
Year-1 input$199
Input for year 2 on$99/yr
Result at year 3$397
$199 for registration, $99 for the agent after that

Position 2 is SD Registered Agent.org: $199 above the state fee and $99 per later year.

Inputs covered

  • Registration completed for you
  • Agent service for the first year

Adds up well

  • Then $99 a year
  • $199 on top of the state fee
  • No agent charge in year one

Adds up badly

  • Limited to one state
3

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

One-state service
Year-1 input$199
Input for year 2 on$99/yr
Result at year 3$397
$199 for registration, $99 for the agent after that

Position 3 is South Dakota Registered Agent.co: $199 above the state fee and $99 per later year.

The year-one and renewal inputs both equal SD Registered Agent.org's.

Inputs covered

  • Registration completed for you
  • Agent service for the first year

Adds up well

  • Then $99 a year
  • $199 on top of the state fee
  • No agent charge in year one

Adds up badly

  • Limited to one state

Year-by-year totals

RankServiceResult, year 1Result, year 2Result, year 3Result, year 5
1Mainstay Filing$199$348$497$795Open Mainstay FilingPartner link. We may earn money if you buy.
2SD Registered Agent.org$199$298$397$595Open SD Registered Agent.orgPartner link. We may earn money if you buy.
3South Dakota Registered Agent.co$199$298$397$595Open South Dakota Registered Agent.coPartner link. We may earn money if you buy.
The first-year price plus renewals, using the prices entered November 13, 2026. No break-even appears within ten years.

Break-even test

Enter a number of years and the calculator recomputes each service's running total.
3 years of fees calculate to Mainstay Filing $497, SD Registered Agent.org $397, South Dakota Registered Agent.co $397. Least paid: SD Registered Agent.org.

South Dakota state fees (official)

InputAmountSource
Filing to register the foreign LLC$750sdsos.gov {input read October 2026, shown in full}
Annual report$55sdlegislature.gov {input read October 2026, shown in full}
State side, 3 years$860Sum of the inputs above
State result = filing fee + the two later reports + any minimum tax. Open-ended costs get a mention but no number.

Why result one is first

For South Dakota, the deciding term was filing work in the price (27% of the formula), where Mainstay Filing came out ahead.

The home state counts as well; a single account for both scored highest.

How South Dakota describes the foreign LLC registration fee and rules

Out-of-state LLCs deliver the Application for Certificate of Authority, Foreign Limited Liability Company to the South Dakota Secretary of State with $750. Add certificate of Existence.

Quoted text: sdlegislature.gov {input read October 2026, shown in full}

The no-service result

Do-it-yourself result: $860 paid to the state across three years. A service at $397 to $497 is what avoiding the forms costs.

About these results

What is the registration fee for a foreign LLC in South Dakota?

$750 for the filing itself, with $199 more for the service in year one.

What do these services calculate to over three years?

Anywhere from $397 to $497 for three years of service.

Which form registers the LLC?

Complete Application for Certificate of Authority, Foreign Limited Liability Company and deliver it to the South Dakota Secretary of State.

Does the South Dakota filing need a document from the home state?

Yes, namely certificate of Existence.

What recurring filing follows registration?

The annual report, charged at $55.

When does one service pass another in total cost?

No break-even within ten years.

Which foreign registration service calculates best for South Dakota?

Mainstay Filing, which wins on filing work in the price. SD Registered Agent.org and South Dakota Registered Agent.co follow.

See also

Input sources

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