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Plain CharterLLC questions, short answers.

Answered simply · South Dakota

3 Best Foreign Registration Services in South Dakota (2026), Plainly Answered

We'd pick Mainstay Filing ($199), SD Registered Agent.org ($199) and South Dakota Registered Agent.co ($199) in South Dakota for 2026, in that order. On top of the $750 state fee, service fees come to $397 to $497 over three years.

By the Plain Charter editorial team ·

Short version

What the state charges
$750
Home-state certificate?
Required
Each year after
$55, annual report
Our order
Mainstay Filing, SD Registered Agent.org then South Dakota Registered Agent.co

The South Dakota picks

Best first, by our stated criteria.
1Top pick

1. Mainstay Filing: best for growing companies

$199 plus the $750 state fee; renewal $149

Start with Mainstay Filing: it costs $199 plus South Dakota's fee, with a free first year of registered agent service and $149 a year after.

It costs $100 more than SD Registered Agent.org over three years; the difference buys one provider in every state.

The registered agent renews at $149 a year in every state.

The price covers

  • Application prepared and sent
  • Registered agent, first year free
  • Any state, one fee

Upsides

  • Same fee in every state
  • Year-one agent included
  • Service fee $199

What to weigh

  • Agent renews at $149, $50 over SD Registered Agent.org
Visit Mainstay FilingPartner link. We may earn money if you buy.
2Local choice

2. SD Registered Agent.org: best for adding just this state

$199 plus the $750 state fee; renewal $99

SD Registered Agent.org comes second: it charges $199 to register with a first year of agent service, then $99 a year.

The price covers

  • Registration, filed
  • A year of agent service

Upsides

  • Service fee $199
  • Agent service, year one
  • Low $99 renewal

What to weigh

  • Home state needs a separate agent
Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
3Local choice

3. South Dakota Registered Agent.co: best for another local option

$199 plus the $750 state fee; renewal $99

South Dakota Registered Agent.co comes third: it charges $199 to register with a first year of agent service, then $99 a year.

Same published prices as SD Registered Agent.org; pick whichever you prefer.

The price covers

  • Registration, filed
  • A year of agent service

Upsides

  • Agent service, year one
  • Service fee $199
  • Low $99 renewal

What to weigh

  • Home state needs a separate agent
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

Compare at a glance

#CompanyTo startRenewalOver three yearsCovers
1Mainstay Filing$199$149/yr$497application prepared and sent; registered agent, first year free; any state, one feeVisit Mainstay FilingPartner link. We may earn money if you buy.
2SD Registered Agent.org$199$99/yr$397Registration, filed; A year of agent serviceVisit SD Registered Agent.orgPartner link. We may earn money if you buy.
3South Dakota Registered Agent.co$199$99/yr$397Registration, filed; A year of agent serviceVisit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
Read from company pricing on November 12, 2026; three years means the first year plus two renewals.

Common questions

When does an out-of-state LLC have to register here?

Registration comes before doing business in South Dakota for any out-of-state LLC.

sdlegislature.gov (October 2026)

What will it cost to register?

The state charges $750; a service adds $199.

Over three years the state's fees reach $860, counting any recurring report. sdsos.gov (October 2026)

What is the application called?

The South Dakota Secretary of State accepts the Application for Certificate of Authority, Foreign Limited Liability Company from LLCs formed elsewhere.

Send along certificate of Existence.

Any ongoing fees?

$55 for the annual report.

When: 1st of the anniversary month.

Why these three?

Because of what the price takes off your plate: Mainstay Filing does best there, and it counts for 30%.

Three-year cost counts for 35% and what the price takes off your plate for 30%; the other three criteria are smaller.

Your home state needs an agent too; one account that covers both is simpler.

The criteria in full

South Dakota requirements checklist

RuleAnswerOfficial source
Application fee$750sdsos.gov (October 2026)
Home-state certificateRequiredsdlegislature.gov (October 2026)
Annual report$55sdlegislature.gov (October 2026)
Paid to the state by year 3$860Our sum of the fees above
Every amount links to its official source. The three-year line is our own sum of filing, reports and any minimum tax.

People also ask

Do I still need an agent in my home state?

Both states have their own rules. Mainstay Filing works in each; a one-state service covers only its state.

Three years in, what has each cost?

Mainstay Filing $497, SD Registered Agent.org $397 and South Dakota Registered Agent.co $397, state fees extra.

Where do these figures come from?

Each state fee links its official source; each service price comes from the company's site.

Is a service required by law?

It is optional; the state charges the same either way.

Do the picks handle the filing?

Each of our picks prepares and files it; the state fee stays the same.

Who is your first choice in South Dakota?

Mainstay Filing tops our list because you pay $199 to register and nothing for the registered agent until year two; SD Registered Agent.org and South Dakota Registered Agent.co come next.

Sources

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