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Filing Verdict

Rankings of registered agents, LLC formation and foreign registration services in all 50 states.

Foreign registration verdict · South Dakota

3 Best Foreign Registration Services in South Dakota (2026)

Filing Verdict's 2026 verdict on foreign registration services in South Dakota: Mainstay Filing ($199), South Dakota Registered Agent.co ($199) and SD Registered Agent.org ($199), in that order. Mainstay Filing takes first place: $199 on top of the state fee, the same in any state, with the first year of registered agent service included.
The Filing Verdict editorial team
Our top pick
Spot 1

1. Mainstay Filing: best for companies working in several states

Service fee $199, $949 due at checkout with the state fee; agent $149 yearly after year one

9.3Editorial score
out of 10

Mainstay Filing wins here: $199 plus the state's own fee, with the registered agent free for the first year and one price in every state.

After the free first year the agent is $149 a year, whichever state you register in.

The three-year bill is $100 higher than South Dakota Registered Agent.co's, and the wider coverage is worth that to us.

What you get

  • The registration, prepared and submitted for you
  • Free registered agent service for the first year
  • Free same-business-day scans of service of process

What we like

  • Registered agent service free in year one
  • One price in all fifty states
  • Same-business-day scans of served papers, free
  • Service fee of $199, plus the state's fee

Cons

  • After year one its agent runs $149 a year, $50 above South Dakota Registered Agent.co
Visit Mainstay FilingPartner link. We may earn money if you buy. Our full Mainstay Filing verdict
Lower renewal than Mainstay
Spot 2

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

Service fee $199, state fee extra; agent $99 yearly after year one

8.8Editorial score
out of 10

Second place goes to South Dakota Registered Agent.co: $199 over the state fee to register in South Dakota, with the agent renewing at $99.

The plan gives the company an in-state street address as its registered office, and papers served on the company are scanned to your online account.

What you get

  • Foreign registration done for you
  • Year-one registered agent service

What we like

  • Agent at $99 yearly after the first year
  • Registration at $199 before state fees
  • Year-one registered agent service included

Cons

  • Covers South Dakota only; your home state needs its own agent
  • The EIN application is billed separately ($99)
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy. Our full South Dakota Registered Agent.co verdict
Low renewal
Spot 3

3. SD Registered Agent.org: best for South Dakota registrations only

Service fee $199, state fee extra; agent $99 yearly after year one

8.6Editorial score
out of 10

Third place goes to SD Registered Agent.org: $199 over the state fee to register in South Dakota, with the agent renewing at $99.

The plan gives the company an in-state street address as its registered office, and papers served on the company are scanned to your online account.

On price and features South Dakota Registered Agent.co and SD Registered Agent.org match line for line, which makes this a close call between safe choices.

What you get

  • Foreign registration done for you
  • Year-one registered agent service

What we like

  • $99 per year keeps the agent from year two
  • A year of registered agent service is part of the price
  • A $199 service fee plus the registration fee

Cons

  • Covers South Dakota only; your home state needs its own agent
  • The EIN application is billed separately ($99)
Visit SD Registered Agent.orgPartner link. We may earn money if you buy. Our full SD Registered Agent.org verdict

The 3 verdicts at a glance

No.ServiceVerdict scoreService feeYear twoBest forVisit
1Mainstay Filing9.3$199$149/yrCompanies registered in several states Visit Mainstay FilingPartner link. We may earn money if you buy.
2South Dakota Registered Agent.co8.8$199$99/yrThe lowest agent renewal here Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
3SD Registered Agent.org8.6$199$99/yrThe lowest agent renewal here Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
The marks out of 10 are editorial: Filing Verdict sets them from the criteria on How we rank, and customers do not rate anything here.

South Dakota foreign registration service prices for 2026: year one, renewals and three years

ServiceYear 1Year 2Year 3Total, 3 yearsAgent covered in year one
Mainstay Filing$199$149$149$497Free
South Dakota Registered Agent.co$199$99$99$397Included
SD Registered Agent.org$199$99$99$397Included
Prices were read from each company's own pages on November 12, 2026. South Dakota's $750 registration fee goes on top of every row and is not counted in these totals.

What settled the order

Filing Verdict gives total over three years and paperwork the price handles 35% each, and renewal behavior, match to the state and up-front pricing split the rest. In South Dakota the order was settled by paperwork the price handles.

Registering in a second state involves two states, so one provider with one price in both scored best on coverage, ahead of South Dakota Registered Agent.co.

The full list of criteria and weights is on How we rank.

South Dakota foreign LLC registration: the fee, the form and the filing office

The company registers with the South Dakota Secretary of State by filing the Application for Certificate of Authority, Foreign Limited Liability Company. The state fee is $750. South Dakota also asks for certificate of Existence.

Afterwards the company files the annual report ($55), due 1st of the anniversary month.

Before you file: a checklist

  • Certificate of Existence.
  • The exact legal name from the home state, and the date the company was formed there.
  • A registered agent with a street address in the state; each service on this page can act in that role.
  • The $750 state fee, paid with the filing.
  • A calendar entry for the annual report and its $55 fee.

What skipping South Dakota registration can cost

Contracts it signs stay valid (SDCL 47-34A-1008(b)).

South Dakota foreign registration service: questions answered

Does South Dakota require an out-of-state LLC to register?

Yes, once it transacts business there.

What does foreign registration cost in South Dakota?

The state fee is $750, and the service fee is $199.

Does South Dakota want a certificate from my home state?

Yes. It asks for certificate of Existence.

Is a registered agent required once I have registered?

Yes. The company still needs a registered agent here, with a street address in the state.

Which foreign registration services are ranked on this page?

Mainstay Filing ($199), South Dakota Registered Agent.co ($199) and SD Registered Agent.org ($199), from first place to last.

Which foreign registration service is the best pick in South Dakota?

Mainstay Filing, because it prepares the South Dakota registration for $199 and serves as your registered agent, free in year one, then $149 a year.

See also

Sources and dates

  1. South Dakota Secretary of State, Business Services / Corporations Division, confirmed August 2026
  2. South Dakota Secretary of State, Business Services / Corporations Division, confirmed August 2026
  3. South Dakota yearly filing: Annual report: fee and how, official source, confirmed October 2026
  4. South Dakota report due date, confirmed August 2026
  5. SDCL 47-34A-203, confirmed August 2026
  6. South Dakota formation fee: Filing fee, official source, confirmed October 2026
  7. South Dakota formation fee: Filing fee, official source, confirmed October 2026
  8. South Dakota registered agent statute, confirmed October 2026
  9. South Dakota Secretary of State, business services, confirmed October 2026
  10. Foreign LLC application for Certificate of Authority, confirmed October 2026
  11. SDCL 47-34A-1003, transacting business, confirmed October 2026
  12. SDCL 47-34A-1008, effect of not registering, confirmed October 2026
  13. SDCL 47-34A-1001 to 47-34A-1009, foreign limited liability companies, confirmed November 2026
  14. Checked November 12, 2026: Mainstay Filing, South Dakota service page
  15. Checked November 12, 2026: South Dakota Registered Agent.co, pricing and service pages
  16. Checked November 12, 2026: SD Registered Agent.org, pricing and service pages