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Foreign registration price index · South Dakota

3 Best Foreign Registration Services in South Dakota (2026): Price Index

The index for 2026 puts South Dakota Registered Agent.co ($199), Mainstay Filing ($199) and SD Registered Agent.org ($199) at the top of the South Dakota foreign registration services ledger, in that order. The state's $750 is common to all lines. Services subtotal $397 to $497 by year three.
Entries by the LLC Price Index editorial team

Index basis: Rows follow our value index, led by three-year cost

Quick tally

State registration line$750sdsos.gov (read October 2026) per the state
First-year column$199Before state charges
Subtotal at year three$397 to $497Opening price + two renewals
State subtotal at year 3$860Not part of the index
First crossingDoes not happenSubtotals keep their order

South Dakota lines, indexed

Service prices only. The $750 state fee is identical on every line.
1

1. South Dakota Registered Agent.co: best for a lean way in on this ledger

Best value on the ledger
First year$199
Years 2 and on$99/yr
Three-year sum$397
$199 for the registration, $99 yearly after

Best value in South Dakota is South Dakota Registered Agent.co: $199 on top of the state fee, agent included for year one, $99/yr afterward.

It beats Mainstay Filing on the three-year column, the largest weight in the index.

Line includes

  • Foreign registration handled
  • Agent service in year one

Credits

  • The first agent year is included
  • $99 a year for the agent afterward
  • $199 for the registration

Debits

  • Covers South Dakota only, so the home state needs its own agent
2

2. Mainstay Filing: best for a second state or a fifth

Works anywhere
First year$199
Years 2 and on$149/yr
Three-year sum$497
$199 for the registration, $149 yearly after

Mainstay Filing fills line 2: $199 beyond South Dakota's fee, then $149 a year for the agent.

The $100 three-year difference from South Dakota Registered Agent.co fixes its position.

After the free year, the agent costs $149 annually, whichever state applies.

Line includes

  • Foreign registration, prepared and sent
  • Registered agent free for the first year
  • Works in all fifty states

Credits

  • $199 for the registration
  • No agent charge the first year
  • One price anywhere

Debits

  • South Dakota Registered Agent.co charges $50 less for the agent
3

3. SD Registered Agent.org: best for a single added state

Single-state plan
First year$199
Years 2 and on$99/yr
Three-year sum$397
$199 for the registration, $99 yearly after

SD Registered Agent.org fills line 3: $199 on top of the state fee, agent included for year one, $99/yr afterward.

Same year-one and renewal prices as South Dakota Registered Agent.co.

Line includes

  • Foreign registration handled
  • Agent service in year one

Credits

  • $99 a year for the agent afterward
  • $199 for the registration
  • The first agent year is included

Debits

  • Covers South Dakota only, so the home state needs its own agent

Subtotal by year

LineProviderTotal, year 1Total, year 2Total, year 3Total, year 5
1South Dakota Registered Agent.co$199$298$397$595Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
2Mainstay Filing$199$348$497$795Visit Mainstay FilingPartner link. We may earn money if you buy.
3SD Registered Agent.org$199$298$397$595Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
Company prices from November 13, 2026, accumulated year by year. The lines never cross within ten years.

Work it out

Subtotals for 1 to 5 years. State fees are omitted because every line carries the same ones.
Over 3 years: South Dakota Registered Agent.co $397, Mainstay Filing $497, SD Registered Agent.org $397. Smallest to date: South Dakota Registered Agent.co.

State fees, with citations

EntryAmountCited from
Registration filing charge$750sdsos.gov (read October 2026) per the state
Annual report$55sdlegislature.gov (read October 2026) per the state
3-year state cost$860Sum of the lines above
The three-year state line combines the filing fee, the reports due in years two and three and any yearly minimum tax. Publication and other variable costs are named but left out of the sum.

Index notes

South Dakota Registered Agent.co indexed above Mainstay Filing on three-year cost index, a 38% column.

Three years with South Dakota Registered Agent.co cost $397, while Mainstay Filing runs $100 higher.

Official South Dakota foreign LLC registration fee and rules

Registering means filing the Application for Certificate of Authority, Foreign Limited Liability Company at the South Dakota Secretary of State and paying $750. The filing asks for certificate of Existence.

Source text: sdlegislature.gov (read October 2026) per the state

The no-service line

Skip the service and you pay South Dakota $860 over three years while handling every form yourself. The services bill $397 to $497 on top for that work.

Price questions

What does South Dakota charge an out-of-state LLC to register?

$750 to the filing office, plus service fees starting in the $199 range.

What is the three-year subtotal for these services?

$397 to $497 across the lines, before state fees.

Which document does the registering?

The registering document is Application for Certificate of Authority, Foreign Limited Liability Company, and the South Dakota Secretary of State is the office that takes it.

Does South Dakota want a paper from the LLC's home state?

Yes: certificate of Existence.

What recurring filing comes after registration?

Next comes the annual report, billed at $55.

When does one line pass another in total cost?

Within ten years, never: the order of the subtotals stays the same.

Which foreign registration service indexes best in South Dakota?

South Dakota Registered Agent.co: line one on three-year cost index. Then Mainstay Filing and SD Registered Agent.org.

Keep comparing

Source lines

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