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Founder Primer

LLC paperwork, boiled down for founders.

Primer 2 · South Dakota

South Dakota Registered Agent Primer (2026): 6 Moves and the 3 Best Agents

Best picks for appointing a registered agent in South Dakota in 2026, in order: Mainstay Filing ($149 a year), South Dakota Registered Agent.co ($99 a year) and SD Registered Agent.org ($99 a year). 6 moves: the South Dakota rule for a registered agent, who qualifies, the address test and how to record the agent.
From the Founder Primer desk

Key facts

Required by law?
Yes
Per sdlegislature.gov, as of October 2026
What our picks charge
$99 to $149 a year
From each company's pricing page
Annual report
$55 a year
Per sdlegislature.gov, as of October 2026
Primer moves
6
First to last

You will know

  • Why South Dakota wants an agent on file
  • The eligibility and address rules
  • How to name or change the agent
  • The agents we rank

South Dakota: services we rank

Marked on the scoring page: three-year cost (27%), to-dos cleared (38%), renewal, fit with South Dakota's rules and readable pricing.

First choice $149 a year; renews at $149

1. Mainstay Filing: best for a nationwide agent at one price

In South Dakota, Mainstay Filing is number one: $149 a year, $149 when it renews, same plan in all fifty states.

You pay $150 more than at South Dakota Registered Agent.co across three years and keep less of the paperwork.

Inside the price
  • A South Dakota street address on file
  • Served papers scanned free, the same business day
  • Three government letters a year scanned at no charge
  • Also serves nonprofits, corporations, LPs and LLPs
In its favor
  • Good in every state
  • A flat $149 per year
Against it
  • $50 more per year than the local pick
  • Agent service only
Visit Mainstay Filing Partner link. We may earn money if you buy.
In-state service $99 a year; renews at $99

2. South Dakota Registered Agent.co: best for single-state companies

Second place is South Dakota Registered Agent.co, because $99 a year with scans of served papers in an online account.

Inside the price
  • A South Dakota street address
  • Legal papers scanned and posted
In its favor
  • $99 a year, no increase
  • Less per year than Mainstay Filing
Against it
  • No help in other states
  • No help with the annual report
Visit South Dakota Registered Agent.co Partner link. We may earn money if you buy.
In-state service $99 a year; renews at $99

3. SD Registered Agent.org: best for a second local choice

Third place is SD Registered Agent.org, because $99 a year with scans of served papers in an online account.

It lists the same prices as South Dakota Registered Agent.co.

Inside the price
  • A South Dakota street address
  • Legal papers scanned and posted
In its favor
  • $99 a year, no increase
  • Less per year than Mainstay Filing
Against it
  • No help in other states
  • No help with the annual report
Visit SD Registered Agent.org Partner link. We may earn money if you buy.

The South Dakota picks compared

# Service Annual price Renewal price Three-year total
1 Mainstay Filing $149 $149/yr $447 Visit Mainstay Filing Partner link. We may earn money if you buy.
2 South Dakota Registered Agent.co $99 $99/yr $297 Visit South Dakota Registered Agent.co Partner link. We may earn money if you buy.
3 SD Registered Agent.org $99 $99/yr $297 Visit SD Registered Agent.org Partner link. We may earn money if you buy.

Posted prices, read November 13, 2026. Switching agents leaves state fees unchanged.

The moves

  1. Move 1

    What South Dakota wants from an agent

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

    Where this comes from: Per sdlegislature.gov, as of October 2026

  2. Move 2

    Who is allowed to act

    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 is in SDCL 59-11-6.

  3. Move 3

    Meet the address rule

    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.

    Each service we rank gives you the in-state address.

  4. Move 4

    Decide who takes the role

    Qualifying owners can name themselves. The recommended agents cost $99 to $149 annually.

  5. Move 5

    Record the appointment

    For a new South Dakota LLC the agent goes on the Articles of Organization. A change later is its own filing with the South Dakota Secretary of State.

    Where this comes from: Per sdlegislature.gov, as of October 2026

  6. Move 6

    Track the repeating filing

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

    Where this comes from: Per sdlegislature.gov, as of October 2026

What you will pay

Line Goes to Figure
Hiring an agent Service $99 to $149 a year
Agent renewal Service $99 to $149 a year
Annual report State agency $55 every year

State amounts are South Dakota's official fees (sources below); service prices come from each company's site. Three years of state cost is the filing, the reports in years two and three and any minimum tax.

How the marks came out

edged out on to-dos the price takes off you, worth 38%.

Covering all fifty states outweighed South Dakota Registered Agent.co in our scoring.

South Dakota questions

Does South Dakota force an LLC to keep a registered agent?

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

Can I be my own registered agent?

Yes, if you pass the eligibility and address tests in moves 2 and 3.

Can I change my registered agent later?

Yes, any time. Move 5 shows how to file the change with the South Dakota Secretary of State.

What does a registered agent cost in South Dakota?

Prices here run $99 to $149 a year.

What does the LLC pay the state each year?

Expect to file the annual report and pay $55 every year.

Which registered agent would you choose?

Our order: Mainstay Filing, South Dakota Registered Agent.co and SD Registered Agent.org. Mainstay Filing leads because $149 a year for an agent that goes wherever the company goes next.

More primers

Sources, so you can check us

  1. Verify South Dakota Secretary of State, Business Services / at sdsos.gov. Our copy of it is from August 2026.
  2. Verify South Dakota Secretary of State, Business Services / at sosenterprise.sd.gov. Our copy of it is from August 2026.
  3. Verify South Dakota yearly filing: Annual report: fee and at sdlegislature.gov. Our copy of it is from October 2026.
  4. Verify South Dakota report due date at sdlegislature.gov. Our copy of it is from August 2026.
  5. Verify SDCL 47-34A-203 at sdlegislature.gov. Our copy of it is from August 2026.
  6. Verify South Dakota formation fee: Filing fee, official source at sdsos.gov. Our copy of it is from October 2026.
  7. Verify South Dakota formation fee: Filing fee, official source at sdlegislature.gov. Our copy of it is from October 2026.
  8. Verify South Dakota registered agent statute at sdlegislature.gov. Our copy of it is from October 2026.
  9. Pricing from Mainstay Filing (South Dakota service page), November 13, 2026
  10. Pricing from South Dakota Registered Agent.co (pricing page), November 13, 2026
  11. Pricing from SD Registered Agent.org (pricing page), November 13, 2026