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Biz Formation Report

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

Provider review · South Dakota

South Dakota Registered Agent.co Review (2026)

By the Biz Formation Report editorial team

$99 a year is what South Dakota Registered Agent.co charges for South Dakota registered agent service, and the same $99 at renewal. The plan covers an in-state street address for the registered office and online scans of legal papers served on the company. a South Dakota LLC formed through it costs $199 plus the state fee, with the first year of agent service included. Foreign registration in South Dakota runs $199 plus the state fee. Our reading: a fit for a South Dakota-only company that wants a fixed agent price and will file its own annual report.

Our finding

South Dakota Registered Agent.co: a fit for a South Dakota-only companies

Score9.3out of 10
Annual price $99; renewal price $99

A straightforward South Dakota agent with a flat price and a fixed renewal.

What you get

  • A registered office with a physical address in the state
  • Every legal paper served is scanned for you to read online

Good

  • $99 a year, unchanged at renewal
  • A lower yearly agent price than Mainstay Filing
  • Offers LLC formation and foreign registration too
  • Year-one agent service is included with LLC formation

Weak spots

  • Submitting the annual report is left to you
  • $99 extra for the EIN application
  • South Dakota only; other states need a different agent
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

What $99 a year includes

Under the $99-a-year plan, South Dakota Registered Agent.co becomes the company's South Dakota registered agent. The company gets an in-state street address for its registered office, and legal papers served there are scanned and uploaded to your account. The renewal price is unchanged at $99.

South Dakota Registered Agent.co for a South Dakota LLC formation

For $199, South Dakota Registered Agent.co prepares and submits the formation document, and South Dakota's own filing fee is extra. Year one of registered agent service is included, then the agent costs $99 a year. An EIN application adds $99, although the IRS issues EINs free of charge.

South Dakota Registered Agent.co leaves the annual report to the owner. South Dakota expects it every year, due due during the entity's anniversary month at $55.

South Dakota Registered Agent.co and foreign registration in South Dakota

South Dakota Registered Agent.co registers an outside company in South Dakota for $199 plus the state's $750 fee. Year one of registered agent service is part of the package. The company supplies certificate of Existence.

South Dakota Registered Agent.co compared with Mainstay Filing

Mainstay Filing's agent plan totals $447 over three years, against $297 at South Dakota Registered Agent.co, a difference of $150. Mainstay Filing offers one agent plan that works in all fifty states and scans the first three government mailings a year free. Mainstay Filing charges $199 a year for formation and files the annual report; South Dakota Registered Agent.co totals $397 over three years for formation and the agent, with no report filing. SD Registered Agent.org is the other South Dakota agent in this report; it charges the same $99 a year, and the two grade close together.

South Dakota Registered Agent.co: common questions

How much does South Dakota Registered Agent.co cost per year?

$99 a year for registered agent service, with no change at renewal. LLC formation costs $199 plus the South Dakota filing fee.

Does South Dakota Registered Agent.co prepare my annual report?

No. The South Dakota annual report is not covered by its published prices, so you submit it.

Is South Dakota Registered Agent.co a reasonable registered agent for a South Dakota LLC?

Yes, for a company that will remain in South Dakota and wants a stable agent price. Its average score across our South Dakota pages is 9.3.

What is included with South Dakota Registered Agent.co?

South Dakota registered office address, with online scans of papers served on the company.

Does South Dakota Registered Agent.co handle foreign registration in South Dakota?

Yes, at $199 plus South Dakota's fee, and it includes a year of agent service.

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Source notes

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