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

Verdict · South Dakota

South Dakota Registered Agent.co Review (2026)

South Dakota Registered Agent.co sells South Dakota registered agent service for $99 a year, the same $99 at renewal. That buys an in-state street address for the registered office and online scans of legal papers served on the company. Forming a South Dakota LLC through it costs $199 plus the state fee, and the first year of agent service is included. For foreign registration in South Dakota it charges $199 plus the state fee. Verdict: a sound choice for a South Dakota-only company that wants a fixed agent price and will file its own annual report.
The Filing Verdict editorial team
The verdict

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

$99 per year, flat

9.1Editorial score
out of 10

A no-frills South Dakota agent with a flat price and a fixed renewal.

What you get

  • A physical in-state address for the registered office
  • Each legal paper served on the company is scanned into your account

What we like

  • $99 a year, flat
  • Undercuts Mainstay Filing's yearly agent price
  • Also sells LLC formation and foreign registration
  • A free first agent year when it forms your LLC

Cons

  • The annual report is left to you
  • The EIN application is billed separately ($99)
  • Covers South Dakota only; other states need another agent
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

What $99 a year buys

South Dakota Registered Agent.co serves as your South Dakota registered agent for $99 a year. The plan supplies an in-state street address for the registered office and scans legal papers served on the company to your online account. At renewal the price stays $99.

Forming a South Dakota LLC through South Dakota Registered Agent.co

South Dakota Registered Agent.co files the formation document for $199, and the state's filing fee goes on top. The first year of registered agent service is included; after that the agent is $99 a year. An EIN application costs $99 extra, although the IRS issues EINs free.

South Dakota expects 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, so that job stays with you.

Registering an outside company in South Dakota with South Dakota Registered Agent.co

South Dakota Registered Agent.co files the registration with the state for $199, plus South Dakota's $750 fee. A year of registered agent service is part of it. You provide certificate of Existence.

South Dakota Registered Agent.co next to Mainstay Filing and the other picks

For the agent alone, South Dakota Registered Agent.co comes to $297 over three years and Mainstay Filing to $447, a gap of $150. Mainstay Filing sells one agent plan for all fifty states and scans the first three government mailings a year free. Mainstay Filing's formation package is $199 a year and includes the annual report; South Dakota Registered Agent.co's LLC route comes to $397 over three years with the agent but without report filing. SD Registered Agent.org, the other South Dakota agent on our list, charges the same $99 a year, and the two finish close together.

South Dakota Registered Agent.co: questions answered

What does South Dakota Registered Agent.co charge?

$99 a year for registered agent service, unchanged at renewal. Forming an LLC costs $199 plus the South Dakota filing fee.

Does South Dakota Registered Agent.co take care of my yearly report?

No. The South Dakota annual report is outside its published prices, so you file it.

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

For a one-state company in South Dakota that wants a steady agent price, yes. Its average score across our South Dakota pages is 9.1.

What comes with the South Dakota Registered Agent.co plan?

South Dakota registered office address, plus scans of served papers sent to your account.

Does South Dakota Registered Agent.co register out-of-state companies in South Dakota?

Yes. It files the registration for $199 plus South Dakota's fee and includes a year of agent service.

More from us

Sources and dates

  1. South Dakota registered agent statute, confirmed October 2026
  2. South Dakota Secretary of State, Business Services / Corporations Division, confirmed August 2026
  3. South Dakota Secretary of State, Business Services / Corporations Division, confirmed August 2026
  4. South Dakota yearly filing: Annual report: fee and how, official source, confirmed October 2026
  5. South Dakota report due date, confirmed August 2026
  6. SDCL 47-34A-203, confirmed August 2026
  7. South Dakota formation fee: Filing fee, official source, confirmed October 2026
  8. South Dakota formation fee: Filing fee, official source, 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: South Dakota Registered Agent.co, home, pricing and service pages
  15. Checked November 12, 2026: Mainstay Filing, South Dakota service pages