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Review · South Dakota

South Dakota Registered Agent.co Review (2026)

With South Dakota Registered Agent.co, South Dakota registered agent service is $99 a year, the same $99 at renewal. You get an in-state street address for your registered office, and legal papers served on the company are scanned to your account. Want to start a South Dakota LLC with it? That's $199 plus the state fee, and your first year of agent service is included. It also registers outside companies in South Dakota, for $199 plus the state fee. The short version: it works well for a company that stays in South Dakota, wants one agent price and doesn't mind filing its own annual report.

By the LLC Review Desk editorial team

Our pick

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

Annual price $99; renewal price $99

Our score

9.0out of 10

9.0 out of 10

Straightforward South Dakota agent service: one price, and it holds when you renew.

In the price

  • A registered office address inside the state
  • The company's served papers show up in your account as scans

What we like

  • $99 a year and it stays flat
  • Cheaper per year than Mainstay Filing's agent-only plan
  • Also does LLC formation and foreign registration
  • Your first agent year is free when you form your LLC with them

Trade-offs

  • Doesn't cover the annual report; that stays with you
  • The EIN application costs $99 extra
  • South Dakota only; for other states you need another agent
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

What you get for $99 a year

For $99 a year, South Dakota Registered Agent.co will be your South Dakota registered agent. You get a registered office address in the state, and anything served on the company is scanned and waiting in your online account. When you renew, it's still $99.

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

South Dakota Registered Agent.co will file your formation paperwork for $199, and you pay the state's filing fee separately. Your first year as registered agent is included, and after that the agent is $99 a year. If you want them to apply for your EIN, that's $99 more, though the IRS gives EINs out free.

South Dakota Registered Agent.co doesn't file the annual report, so that one is yours. In South Dakota it comes every year, by due during the entity's anniversary month, and the state asks $55.

Bringing a company from another state into South Dakota with South Dakota Registered Agent.co

Registration with South Dakota is $199 through South Dakota Registered Agent.co, plus the state's $750. Your first year as registered agent comes with it. You'll need to provide certificate of Existence.

How South Dakota Registered Agent.co compares with Mainstay Filing and our other picks

If you only want the agent, three years cost $297 with South Dakota Registered Agent.co and $447 with Mainstay Filing, a difference of $150. Mainstay Filing has one agent plan that works 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; forming through South Dakota Registered Agent.co comes to $397 across three years, agent included, but report filing isn't part of it. SD Registered Agent.org, the other South Dakota agent we picked, charges the same $99 a year, so the two end up close.

Your questions about South Dakota Registered Agent.co

How much does South Dakota Registered Agent.co cost?

As your registered agent, it charges $99 a year and keeps that price when you renew. To form an LLC in South Dakota, add $199 plus the state's filing fee.

Will South Dakota Registered Agent.co send in my yearly report?

No. The South Dakota annual report isn't in its published prices, so that one's yours.

Would South Dakota Registered Agent.co work well as the registered agent for a South Dakota LLC?

Yes, if your company is in South Dakota and you like paying one steady price for the agent. Its average score across our South Dakota pages is 9.0.

What do I get with South Dakota Registered Agent.co?

A registered office address in South Dakota, plus scans of any papers served on the company, sent to your account.

Will South Dakota Registered Agent.co handle foreign registration for my company in South Dakota?

Yes. The price is $199 plus South Dakota's fee, and your first year as agent comes along.

More from us

Where we got the numbers

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