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Filing Verdict

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

Registered agent verdict · South Dakota

3 Best Registered Agents in South Dakota (2026)

Filing Verdict's 2026 verdict on registered agents in South Dakota: South Dakota Registered Agent.co ($99 a year), Mainstay Filing ($149 a year) and SD Registered Agent.org ($99 a year), in that order. South Dakota Registered Agent.co takes first place: a South Dakota specialist at $99 a year, with an in-state street address for the registered office.
The Filing Verdict editorial team
Best here
Spot 1

1. South Dakota Registered Agent.co: best for the lowest yearly fee on this list

$99 per year, flat

9.4Editorial score
out of 10

South Dakota Registered Agent.co wins here: $99 a year, flat, with served legal papers scanned and sent to you online.

With South Dakota Registered Agent.co, the registered office address sits in the state, and anything served on the company is scanned and sent to you online.

Over three years it comes in under Mainstay Filing, and cost is one of our two heaviest criteria.

What you get

  • A registered office address inside the state
  • Legal papers delivered to the company arrive in your account as scans

What we like

  • Yearly price under Mainstay Filing's
  • Forms LLCs too, first agent year included
  • $99 per year, renewing at the same price

Cons

  • The annual report filing is yours to handle
  • Built for South Dakota; other states need a separate agent
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy. Our full South Dakota Registered Agent.co verdict
Best for multi-state companies
Spot 2

2. Mainstay Filing: best for all fifty states

$149 per year, flat

8.9Editorial score
out of 10

Second place goes to Mainstay Filing: $149 a year whether the company stays put or expands, and the first three government mailings each year are scanned free.

New company? Mainstay's formation package at $199 a year adds the South Dakota filing and the annual report.

Over three years South Dakota Registered Agent.co is $150 cheaper, which puts Mainstay Filing behind it on cost.

What you get

  • A street address in the state, on the public record
  • Same-business-day scan and upload of served papers, no charge
  • The first three government mailings each year scanned free
  • Compliance reminders

What we like

  • Same-business-day scans of served papers, free
  • Serves LLCs, corporations, LPs, LLPs and nonprofits
  • $149 a year, unchanged at renewal
  • Three government mailings a year scanned free

Cons

  • The agent alone runs $50 a year above South Dakota Registered Agent.co
  • Report filing is a formation-package feature, not part of the agent plan
Visit Mainstay FilingPartner link. We may earn money if you buy. Our full Mainstay Filing verdict
South Dakota specialist
Spot 3

3. SD Registered Agent.org: best for South Dakota specialists

$99 per year, flat

8.7Editorial score
out of 10

Third place goes to SD Registered Agent.org: $99 a year, flat, with served legal papers scanned and sent to you online.

Your registered office address comes from SD Registered Agent.org, and legal papers served there are scanned to your online account.

Nothing in the published prices or features divides South Dakota Registered Agent.co from SD Registered Agent.org; pick either.

What you get

  • The in-state street address the state requires
  • Papers served on the company are scanned and posted to your online account

What we like

  • Cheaper per year than Mainstay Filing
  • Yearly cost of $99, unchanged when it renews
  • LLC formation available, first agent year free

Cons

  • The annual report filing is yours to handle
  • Built for South Dakota; other states need a separate agent
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 scoreYearly priceRenewalBest forVisit
1South Dakota Registered Agent.co9.4$99$99/yrThe lowest yearly price we rank here Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
2Mainstay Filing8.9$149$149/yrAn agent that works in all fifty states Visit Mainstay FilingPartner link. We may earn money if you buy.
3SD Registered Agent.org8.7$99$99/yrThe lowest yearly price we rank here Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
Scores come from Filing Verdict's editors, out of 10, using the criteria explained on How we rank; they are not customer ratings.

South Dakota registered agent prices for 2026: year one, renewals and three years

ServiceYear 1Year 2Year 3Total, 3 yearsRenewal price unchanged
South Dakota Registered Agent.co$99$99$99$297Yes
Mainstay Filing$149$149$149$447Yes
SD Registered Agent.org$99$99$99$297Yes
Prices were read from each company's own pages on November 12, 2026. South Dakota's fees do not depend on which agent you choose.

What settled the order

Two criteria lead Filing Verdict's method at 35% apiece: total over three years and paperwork the price handles. Renewal behavior, match to the state and up-front pricing share the other 30%, and South Dakota came down to total over three years.

South Dakota Registered Agent.co totals $297 over three years, $150 under Mainstay Filing. A company that needs an agent in South Dakota only gains little from fifty-state coverage, so the lower yearly price decided it.

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

South Dakota registered agent requirements, from South Dakota Secretary of State (official)

Every LLC must name a registered agent with an in-state street address. The address has to be an actual street address or rural route box number in South Dakota, plus a South Dakota mailing address if it differs. Citation: SDCL 59-11-6.

South Dakota annual report: what it costs and when it is due

Every South Dakota LLC owes the annual report every year. The state fee is $55, due due during the entity's anniversary month. A late filing adds $50. Notices about it go to your registered agent.

South Dakota registered agent: questions answered

Must a South Dakota LLC have a registered agent?

Yes. South Dakota requires every LLC to keep a registered agent on file, and the agent needs a street address in the state.

What do South Dakota registered agents charge each year?

The prices run $99 to $149 a year, and every service keeps its price at renewal.

May I act as my own registered agent?

Only if you meet the state's conditions. A commercial registered agent listed with the state, a noncommercial agent (an individual or entity with a South Dakota address), or the title of an office in the company.

What is the due date for the South Dakota annual report?

Due due during the entity's anniversary month; the state fee is $55. Filing late adds $50.

Which registered agents are ranked on this page?

South Dakota Registered Agent.co ($99 a year), Mainstay Filing ($149 a year) and SD Registered Agent.org ($99 a year), from first place to last.

Which registered agent is the best value in South Dakota?

South Dakota Registered Agent.co, because $99 a year, unchanged at renewal, and the lowest yearly price on this list.

Related pages

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. Checked November 12, 2026: South Dakota Registered Agent.co, pricing and service pages
  10. Checked November 12, 2026: Mainstay Filing, South Dakota service page
  11. Checked November 12, 2026: SD Registered Agent.org, pricing and service pages