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Review · South Dakota

South Dakota Registered Agent.co Review (2026)

South Dakota Registered Agent.co is a South Dakota registered agent service at $99 a year, the same $99 at renewal. You get a registered office address inside the state, and a scan of each legal paper served on the company lands in your online account. Starting a South Dakota LLC with this company runs $199 above the state fee, and the first year as your agent is thrown in. Registering an outside company in South Dakota through it runs $199 on top of the state fee. Bottom line: it suits a South Dakota-only company that likes a fixed agent price and will handle its own annual report.

From the Filing Shortlist editorial team

Shortlisted

South Dakota Registered Agent.co: on the list for a South Dakota-only companies

$99 yearly

Editor score8.8out of 10

A plain South Dakota agent with one price and no renewal surprises.

In the price

  • A registered office with a street address in the state
  • Anything served on the company is scanned and posted to your account

Good

  • A flat $99 a year
  • Cheaper each year than Mainstay Filing's agent plan
  • Also offers LLC formation and foreign registration
  • The first agent year is free when it forms your LLC

Watch for

  • You still file the annual report yourself
  • The EIN application costs extra ($99)
  • South Dakota only; other states need a different agent
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

What you get for $99 a year

South Dakota Registered Agent.co fills the South Dakota registered agent role at $99 a year. The plan includes a registered office address inside the state, and each legal paper served on the company is scanned into your online account. The price holds at $99 on renewal.

Starting a South Dakota LLC with South Dakota Registered Agent.co

South Dakota Registered Agent.co files the formation paperwork for $199, with the state filing fee added. Year one of registered agent service comes with it, and the agent then costs $99 a year. The EIN application is an extra $99, though the IRS hands out EINs for free.

South Dakota wants the annual report every year, due due during the entity's anniversary month with a $55 state fee. South Dakota Registered Agent.co does not file it for you.

Registering a foreign LLC in South Dakota through South Dakota Registered Agent.co

South Dakota Registered Agent.co handles the state registration for $199, and South Dakota charges $750 on top. The first year as registered agent is covered. You supply certificate of Existence.

South Dakota Registered Agent.co compared with Mainstay Filing and the rest of the list

For the agent alone, three years with South Dakota Registered Agent.co come to $297 and with Mainstay Filing to $447, a difference of $150. Mainstay Filing has a single agent plan that is good in every state and scans the first three government mailings a year free. Mainstay Filing's package is $199 a year and includes the annual report; with South Dakota Registered Agent.co the LLC route adds up to $397 over three years including the agent, but report filing is not covered. SD Registered Agent.org, the other South Dakota agent we shortlisted, asks the same $99 a year, and the two end up near each other.

Common questions about South Dakota Registered Agent.co

What is the price of South Dakota Registered Agent.co?

$99 a year for registered agent service, the same at renewal. An LLC formation is $199 plus the South Dakota filing fee.

Will South Dakota Registered Agent.co file my annual report?

No. The South Dakota annual report is not in its published prices, so you file it.

Is South Dakota Registered Agent.co a fair pick for a South Dakota LLC?

Yes, if the company is based in South Dakota and you want a steady agent price. Its average score across our South Dakota pages is 8.8.

What is in the South Dakota Registered Agent.co plan?

A registered office address in South Dakota, and a scan of any papers served on the company posted to your account.

Can South Dakota Registered Agent.co register an out-of-state company in South Dakota?

Yes. It handles the registration filing at $199, with South Dakota's fee added, and a year as your agent is part of the deal.

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Where the figures come from

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