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A practical guide · South Dakota

3 Best Registered Agents in South Dakota (2026), Ranked for You

For registered agents in South Dakota, we recommend Mainstay Filing ($149 a year), South Dakota Registered Agent.co ($99 a year) and SD Registered Agent.org ($99 a year) in 2026, ranked from first to last. Prices start at $99 to $149 for the first year and add up to $297 to $447 by year three.
Written by the Simple Filing Guide editorial team

The short route

Must you have one?
Yes, by law
Legal title
Registered agent
Price of an agent
$99 to $149 annually
Our ranking
Mainstay Filing, South Dakota Registered Agent.co then SD Registered Agent.org

Our South Dakota shortlist

Prices come from each company's own page. Read how we rank for the method.

#1 Number 1

1. Mainstay Filing: best for one agent for every state

$149 a year, then $149 at renewal

Start with Mainstay Filing in South Dakota: its price is $149 a year across all fifty states.

South Dakota Registered Agent.co costs $150 less over three years, provided the company never leaves South Dakota.

Checklist: what is included
  • Registered office in the state
  • Free scans of three government mailings per year
  • Covers more than LLCs: corporations, LPs, LLPs and nonprofits
What works
  • Flat $149 a year, no change at renewal
  • A single account works in any state
Gaps
  • Costs $50 more per year than South Dakota Registered Agent.co
  • Nothing beyond the agent role
Open Mainstay Filing Partner link. We may earn money if you buy.
#2 One-state pick

2. South Dakota Registered Agent.co: best for tight budgets

$99 a year, then $99 at renewal

Why South Dakota Registered Agent.co second? Because you get an in-state agent for $99 a year.

Checklist: what is included
  • A local address on file
  • Legal papers scanned to your account
What works
  • Flat $99 a year, no change at renewal
  • Costs less per year than Mainstay Filing
Gaps
  • Covers South Dakota and nothing else
  • Not included: the annual report
Open South Dakota Registered Agent.co Partner link. We may earn money if you buy.
#3 One-state pick

3. SD Registered Agent.org: best for owners who prefer a local firm

$99 a year, then $99 at renewal

Why SD Registered Agent.org third? Because you get an in-state agent for $99 a year.

Price for price it ties with South Dakota Registered Agent.co.

Checklist: what is included
  • A local address on file
  • Legal papers scanned to your account
What works
  • Flat $99 a year, no change at renewal
  • Costs less per year than Mainstay Filing
Gaps
  • Covers South Dakota and nothing else
  • Not included: the annual report
Open SD Registered Agent.org Partner link. We may earn money if you buy.

Costs side by side

#CompanyYear-one costAt renewal3-year totalIncluded
1 Mainstay Filing $149$149/yr$447registered office in the state; free scans of three government mailings per year; Covers more than LLCs: corporations, LPs, LLPs and nonprofits Open Mainstay Filing Partner link. We may earn money if you buy.
2 South Dakota Registered Agent.co $99$99/yr$297A local address on file; legal papers scanned to your account Open South Dakota Registered Agent.co Partner link. We may earn money if you buy.
3 SD Registered Agent.org $99$99/yr$297A local address on file; legal papers scanned to your account Open SD Registered Agent.org Partner link. We may earn money if you buy.

Each company's listed prices on November 13, 2026. State fees are extra and do not vary by pick.

Questions to settle

Must I name a registered agent?

Every LLC must name a registered agent with an in-state street address.

Governing law: SDCL 59-11-6. sdlegislature.gov, confirmed October 2026, official source

Who qualifies as an agent?

A commercial registered agent listed with the state, a noncommercial agent (an individual or entity with a South Dakota address), or the title of an office in the company.

When you fit the rule, you can fill the role for free.

What will I pay an agent?

The recommended services charge $99 to $149 annually; three years cost $297 to $447.

The state bills the same amount with any agent.

What is the agent for?

When a lawsuit or a state letter reaches the LLC in South Dakota, the agent receives it.

The aim is that nothing important sits unnoticed while you are away. Service of process, defined

What recurs besides the agent?

Expect the annual report to come back every year, at $55 each time. In the state's words it is due due during the entity's anniversary month, so mark the date.

sdlegislature.gov, confirmed October 2026, official source

How did you rank them?

Mainstay Filing wins on filing jobs included, a 27% check.

64% of the score comes from total for three years and filing jobs included.

Check the reach: only the first pick works in all fifty states, and that matters when your LLC registers elsewhere.

See the scoring

South Dakota checklist, with sources

ItemDetailsOfficial source
Fee to file the LLC $150sdlegislature.gov, confirmed October 2026, official source
Registered agent Yes, by lawsdlegislature.gov, confirmed October 2026, official source
Annual report $55 every yearsdlegislature.gov, confirmed October 2026, official source
What the state collects in three years $260The rows above, totaled

Last row = filing fee + report in year two + report in year three + minimum tax, if any. Variable costs are described in the text, not added.

FAQ

May I name myself as agent?

Usually. Check who qualifies and what address counts, and if you fit, do it yourself.

Where does the agent have to be located?

The address has to be an actual street address or rural route box number in South Dakota, plus a South Dakota mailing address if it differs.

What do the picks cost over three years?

Three-year costs: Mainstay Filing, $447; South Dakota Registered Agent.co, $297; SD Registered Agent.org, $297

Where do you get the fees?

State-set fees come from South Dakota's publications; what services charge comes from the prices they post.

Do I need to hire a service?

Nothing requires a service. Consider it a paid convenience.

Which registered agent should I start with in South Dakota?

Mainstay Filing, because it charges $149 a year in this state, and the price is the same in every other state. Then South Dakota Registered Agent.co and SD Registered Agent.org.

Sources and price pages

  1. sdsos.gov (South Dakota Secretary of State), verified August 2026
  2. sosenterprise.sd.gov (South Dakota Secretary of State), verified August 2026
  3. sdlegislature.gov (South Dakota yearly filing: Annual), verified October 2026
  4. sdlegislature.gov (South Dakota report due date), verified August 2026
  5. sdlegislature.gov (SDCL 47-34A-203), verified August 2026
  6. sdsos.gov (South Dakota formation fee: Filing), verified October 2026
  7. sdlegislature.gov (South Dakota formation fee: Filing), verified October 2026
  8. sdlegislature.gov (South Dakota registered agent statute), verified October 2026
  9. Prices read November 13, 2026 from the Mainstay Filing South Dakota service page
  10. Prices read November 13, 2026 from the South Dakota Registered Agent.co pricing page
  11. Prices read November 13, 2026 from the SD Registered Agent.org pricing page