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Founder Mentor Guide

Walkthrough 2 · South Dakota

South Dakota Registered Agent Walkthrough (2026): 6 Stages and the 3 Best Agents

Here is the short answer for naming a registered agent in South Dakota in 2026: South Dakota Registered Agent.co ($99 a year), Mainstay Filing ($149 a year) and SD Registered Agent.org ($99 a year), ranked from first to last. In 6 stages you will know what South Dakota wants from a registered agent, who can do the job, which address works and how to make the appointment official.

Advice from the Founder Mentor Guide mentors

Walkthrough snapshot

Must you name one?
Yes
sdlegislature.gov, seen in October 2026
Agent price range
$99 to $149 a year
From company pricing pages
Annual report
$55 a year
sdlegislature.gov, seen in October 2026
Stages in this walkthrough
6
In order

Walkthrough goals

  • Why South Dakota wants an agent on file
  • Who can act as agent
  • Getting the agent listed
  • Who we would phone as agent

The South Dakota call list

Five weighted criteria set the order (see how we score), and three-year cost and work taken off your desk count most.

Our call

1. South Dakota Registered Agent.co: best for owners watching every dollar

Top recommendationFirst year $99, second year $99

South Dakota Registered Agent.co is our first call in South Dakota: a street address in the state for $99 a year.

Its three-year total is under Mainstay Filing's, which earns first place because cost carries 32%.

What you get

  • An in-state office address
  • Online copies of legal papers

What works

  • Less each year than Mainstay Filing
  • $99 a year, same at renewal

What to watch

  • Another state means another agent
  • You finish the annual report on your own
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

Our call

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

Does the most for youFirst year $149, second year $149

Mainstay Filing comes in second: one annual fee of $149 follows the company when it expands, and renewal stays $149.

South Dakota Registered Agent.co comes in $150 cheaper across three years, enough to keep this one out of first.

What you get

  • A real street address in the state
  • Papers served on the company are scanned for you, no charge
  • Up to three government mailings a year are scanned for free
  • Also works for nonprofits, corporations, LPs and LLPs

What works

  • A flat $149 yearly
  • The same provider anywhere

What to watch

  • Costs $50 extra every year
  • Agent service and nothing more
Visit Mainstay FilingPartner link. We may earn money if you buy.

Our call

3. SD Registered Agent.org: best for a local backup

Local choiceFirst year $99, second year $99

Our third call, SD Registered Agent.org: a street address in the state for $99 a year.

Its prices are identical to South Dakota Registered Agent.co's, so either is fine on cost.

What you get

  • An in-state office address
  • Online copies of legal papers

What works

  • Less each year than Mainstay Filing
  • $99 a year, same at renewal

What to watch

  • Another state means another agent
  • You finish the annual report on your own
Visit SD Registered Agent.orgPartner link. We may earn money if you buy.

Every price in one table

#ServiceAnnual priceRenewal priceThree-year total
1South Dakota Registered Agent.co$99$99/yr$297Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
2Mainstay Filing$149$149/yr$447Visit Mainstay FilingPartner link. We may earn money if you buy.
3SD Registered Agent.org$99$99/yr$297Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
Listed prices, viewed November 13, 2026. The state bills the same no matter which agent you name.

The stages

  1. Stage 1

    Begin with the rule

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

    Check it yourself: sdlegislature.gov, seen in October 2026

  2. Stage 2

    See who is eligible

    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. The rule comes from SDCL 59-11-6.

  3. Stage 3

    Pass the address test

    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.

    The record shows the service's address instead of yours.

  4. Stage 4

    Be your own agent or hire one

    Qualify and you may serve yourself. A professional from our list runs $99 to $149 per year.

  5. Stage 5

    Put the agent on the state's record

    A brand-new LLC lists its agent on the Articles of Organization, which goes to the South Dakota Secretary of State. Swapping agents later means filing a change with the same office.

    Check it yourself: sdlegislature.gov, seen in October 2026

  6. Stage 6

    Update when something changes

    South Dakota checks the agent's details through the annual report ($55, every year, due due during the entity's anniversary month); letters about it go to your registered agent.

    Check it yourself: sdlegislature.gov, seen in October 2026

What the agent costs in South Dakota

EntryReceiverSum
Registered agent serviceThe service company$99 to $149 a year
From year twoThe service company$99 to $149 a year
Annual reportState office$55 every year
Whatever goes to South Dakota is an official fee you can verify on the pages listed below. The three-year row combines the filing, two later reports and a minimum tax where there is one; service prices stay out of it.

How we scored the South Dakota picks

edged out on three-year bill, which counts for 32%.

South Dakota Registered Agent.co wins the cost score at $297 over three years, against $150 more at Mainstay Filing.

Common questions

Will South Dakota insist on a registered agent for your LLC?

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

Can I be my own registered agent?

Maybe. Stages 2 and 3 show whether both rules fit you.

Can I change my registered agent later?

Change it whenever you like through the South Dakota Secretary of State, as stage 5 describes.

What does a registered agent cost in South Dakota?

The agents we recommend charge $99 to $149 a year.

What does the LLC pay the state each year?

The main cost is the annual report, $55 every year.

Which registered agent would you choose?

South Dakota Registered Agent.co, Mainstay Filing and SD Registered Agent.org, from the top score to the lowest.

Where we got the facts

  1. South Dakota Secretary of State, Business Services /: go straight to sdsos.gov, checked August 2026.
  2. South Dakota Secretary of State, Business Services /: go straight to sosenterprise.sd.gov, checked August 2026.
  3. South Dakota yearly filing: Annual report: fee and: go straight to sdlegislature.gov, checked October 2026.
  4. South Dakota report due date: go straight to sdlegislature.gov, checked August 2026.
  5. SDCL 47-34A-203: go straight to sdlegislature.gov, checked August 2026.
  6. South Dakota formation fee: Filing fee, official source: go straight to sdsos.gov, checked October 2026.
  7. South Dakota formation fee: Filing fee, official source: go straight to sdlegislature.gov, checked October 2026.
  8. South Dakota registered agent statute: go straight to sdlegislature.gov, checked October 2026.
  9. South Dakota Registered Agent.co pricing page; prices copied November 13, 2026
  10. Mainstay Filing South Dakota service page; prices copied November 13, 2026
  11. SD Registered Agent.org pricing page; prices copied November 13, 2026