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Formation Scorecard

Write-up · South Dakota

South Dakota Registered Agent.co Review (2026)

South Dakota Registered Agent.co charges $99 a year for South Dakota registered agent service, with the same $99 at renewal. The plan includes an in-state street address for the registered office and online scans of legal papers served on the company. The company also forms a South Dakota LLC for $199 plus the state fee, counting the first year of agent service in that price. It also handles foreign registration in South Dakota at $199 plus the state fee. Score note: a good match for a South Dakota-only company that wants a flat agent price and files its own annual report.
Researched and written by the Formation Scorecard editorial team
Score summary

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

9.1 Editor score out of 10
$99 a year, the same at renewal

A plain South Dakota agent: flat price, fixed renewal, nothing fancy.

What you get

  • A state street address serving as the registered office
  • Online scans of each legal paper served on the company

Strengths

  • $99 a year with no step up
  • Costs less each year than Mainstay Filing
  • Handles LLC formation and foreign registration as well
  • Year-one agent service is free when it forms your LLC

Watch for

  • Annual report filing is not covered
  • EIN application costs $99 extra
  • Serves South Dakota only, so other states need their own agent
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

The $99 plan, line by line

For $99 a year, South Dakota Registered Agent.co acts as the South Dakota registered agent. You receive an in-state street address for the registered office, and papers served on the company are scanned and posted to your account. Renewal holds at $99.

Using South Dakota Registered Agent.co to form a South Dakota LLC

South Dakota Registered Agent.co prepares and files the formation document for $199; the state's filing fee is billed separately. Year one of registered agent service comes with it, and the agent runs $99 a year afterwards. The EIN application is a $99 extra, though the IRS charges nothing for an EIN.

Later, South Dakota asks for the annual report every year, due due during the entity's anniversary month with a $55 fee. South Dakota Registered Agent.co does not file it, so it stays on your list.

Bringing an existing company into South Dakota with South Dakota Registered Agent.co

South Dakota Registered Agent.co sends the registration to the state for $199, and South Dakota's $750 fee is added. A year of registered agent service rides along. You supply certificate of Existence.

Where South Dakota Registered Agent.co stands against Mainstay Filing

Agent service alone adds up to $297 over three years at South Dakota Registered Agent.co and $447 at Mainstay Filing, a $150 spread. Mainstay Filing runs a single agent plan across all fifty states and scans the first three government mailings a year free. Mainstay Filing's formation package costs $199 a year and adds the annual report, while South Dakota Registered Agent.co's LLC route totals $397 over three years with the agent but no report filing. SD Registered Agent.org is the other South Dakota agent on the card; it charges the same $99 a year, and the two sit close together.

South Dakota Registered Agent.co: quick questions

What is South Dakota Registered Agent.co's price?

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

Will South Dakota Registered Agent.co handle my yearly report?

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

Does South Dakota Registered Agent.co score well as a registered agent for a South Dakota LLC?

Yes, when the company will stay in South Dakota and wants a steady agent price. Its average score across our South Dakota pages is 9.1.

What does the South Dakota Registered Agent.co plan include?

A South Dakota registered office address and online scans of anything served on the company.

Can South Dakota Registered Agent.co bring an outside company into South Dakota?

Yes, for $199 plus South Dakota's fee, with a year of agent service included.

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Where the figures come from

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