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Researched and written by the Launchwise Review editorial team
Launchwise Review

Rankings of registered agents, LLC formation and foreign registration services in all 50 states.

Launch guide · South Dakota · LLC service

3 Best LLC Services in South Dakota (2026)

Researched and written by the Launchwise Review editorial team
For a 2026 launch in South Dakota, Launchwise Review grades LLC services this way: South Dakota Registered Agent.co ($199), Mainstay Filing ($199) and SD Registered Agent.org ($199). South Dakota Registered Agent.co earns the top grade here: $199 for formation plus the state fee, then $99 yearly for the agent.
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Our top pick

1. South Dakota Registered Agent.co: best for a South Dakota LLC that wants to stay close to home

$199 to form, then $99 a year for the agent, plus the state fee

Our mark 9.4 out of 10

Top grade, South Dakota Registered Agent.co: South Dakota formation at $199 on top of the state fee, year-one registered agent service included, then $99 a year.

You get an in-state street address for the registered office, and any papers served on the company are scanned into your online account.

The annual report is not in its published price, so that task stays on your list with South Dakota, due every year.

On a three-year bill it comes in under Mainstay Filing, and that is a heavily weighted criterion for us.

In the price

  • South Dakota formation filed for you
  • A first year as your registered agent

Pros

  • Year-one registered agent duty is covered
  • A $199 service price plus the state fee
  • Year-two agent price: $99

Less good

  • No annual report filing in the price
  • EIN application costs extra ($99)
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
Read the South Dakota Registered Agent.co launch review
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Best bundle

2. Mainstay Filing: best for formation, agent and annual report wrapped into one price

$199 yearly, state fee billed on top ($349 at checkout in all)

Our mark 9.1 out of 10

Next up is Mainstay Filing: one $199 yearly price filing the South Dakota formation, serving as your registered agent and filing the annual report, then renewing at $199.

When renewal comes, Mainstay prepares and files the annual report so it is off your list. The South Dakota fee is $55 every year, with a due during the entity's anniversary month deadline, and being late adds $50; Mainstay passes the fee along at cost.

South Dakota Registered Agent.co is $200 lower across three years, which puts Mainstay Filing behind it on cost.

In the price

  • Formation paperwork prepared and sent in
  • A full year as your registered agent
  • Annual report, prepared and filed each cycle
  • Your EIN application, done for you

Pros

  • South Dakota's fee goes through at cost
  • Renews at $199 without add-ons
  • A single $199 yearly price that covers the annual report
  • Your EIN application is included

Less good

  • After year one the agent portion is $100 a year above South Dakota Registered Agent.co's
Visit Mainstay FilingPartner link. We may earn money if you buy.
Read the Mainstay Filing launch review
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Best local option

3. SD Registered Agent.org: best for a launch that stays in South Dakota

$199 to form, then $99 a year for the agent, plus the state fee

Our mark 9.0 out of 10

Rounding out the list is SD Registered Agent.org: South Dakota formation at $199 on top of the state fee, year-one registered agent service included, then $99 a year.

You get an in-state street address for the registered office, and any papers served on the company are scanned into your online account.

The annual report is not in its published price, so that task stays on your list with South Dakota, due every year.

Nothing in the published price or features separates South Dakota Registered Agent.co from SD Registered Agent.org; go with whichever you like.

In the price

  • South Dakota formation filed for you
  • A first year as your registered agent

Pros

  • Keeps your agent for $99 yearly
  • Covers the first year of registered agent service
  • $199 to start the LLC, plus the filing fee

Less good

  • No annual report filing in the price
  • EIN application costs extra ($99)
Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
Read the SD Registered Agent.org launch review

The 3 grades at a glance

Place Company Launch grade Service price Second year Best fit Go
1 South Dakota Registered Agent.co 9.4 $199 $99/yr A South Dakota launch on a tight budget Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
2 Mainstay Filing 9.1 $199 $199/yr Formation, agent and annual report wrapped into one price Visit Mainstay FilingPartner link. We may earn money if you buy.
3 SD Registered Agent.org 9.0 $199 $99/yr A South Dakota launch on a tight budget Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
Each grade out of 10 reflects our editors' reading of the weighted criteria on How we rank, not a customer rating.

South Dakota LLC service cost in 2026: first year, renewals, three-year total

Company Year 1 Year 2 Year 3 Three years, total Files the annual report for you
South Dakota Registered Agent.co $199 $99 $99 $397 No
Mainstay Filing $199 $199 $199 $597 Yes
SD Registered Agent.org $199 $99 $99 $397 No
Prices were copied from each company's own pages on November 12, 2026. Add South Dakota's $150 filing fee to any row; it is not in the totals.

Why this order

Launchwise Review puts 26% on cost to launch and stay and 26% on launch paperwork handled, then spreads 48% over renewal behavior, state match and price transparency. For South Dakota, the call came down to cost to launch and stay.

South Dakota Registered Agent.co comes to $397 over three years, $200 under Mainstay Filing. Mainstay would file the annual report too, but an owner can handle it alone for the state fee, so the lower price took this page.

Every criterion and weight is listed on How we rank.

Launching in South Dakota: the state filing fee and form

Plan on $150 at the South Dakota Secretary of State when you file the Articles of Organization. Each company below adds that state fee at cost.

What the state says about turnaround: Paper 1 to 3 business days; online processed immediately.

Your South Dakota LLC after launch: the upkeep list

Next on the list: the annual report, every year, due due during the entity's anniversary month. Set aside $55 for the state. Late filing adds $50. Every LLC must name a registered agent with an in-state street address.

Quick answers about South Dakota LLC services

What will it cost to launch an LLC in South Dakota?

The state filing fee is $150; add a service fee of $199.

Which form starts the LLC?

Look for the Articles of Organization at the South Dakota Secretary of State.

How soon does South Dakota approve a new LLC?

Plan around Paper 1 to 3 business days; online processed immediately, the state's own standard processing estimate.

Is a registered agent required on the South Dakota formation form?

Yes. You name one on the formation form and keep one on file, with a street address in South Dakota.

What stays on the to-do list after the LLC is launched?

The annual report is the recurring item, filed every year with a due during the entity's anniversary month deadline and a $55 state charge.

Will the EIN application be handled in this price?

Mainstay Filing folds it into the yearly price. The application runs $99 at South Dakota Registered Agent.co and SD Registered Agent.org. Founders can also get an EIN from the IRS directly, with no fee.

Which service is the best start for a new South Dakota LLC?

South Dakota Registered Agent.co, because it forms the LLC in South Dakota for $199 over the state's fee, with the registered agent free for year one, and keeps the agent for $99 a year.

More from us

Sources and dates

  1. South Dakota Secretary of State, Business Services / Corporations Division, dated August 2026
  2. South Dakota Secretary of State, Business Services / Corporations Division, dated August 2026
  3. South Dakota yearly filing: Annual report: fee and how, official source, dated October 2026
  4. South Dakota report due date, dated August 2026
  5. SDCL 47-34A-203, dated August 2026
  6. South Dakota formation fee: Filing fee, official source, dated October 2026
  7. South Dakota formation fee: Filing fee, official source, dated October 2026
  8. South Dakota registered agent statute, dated October 2026
  9. Processing, official source, dated October 2026
  10. From South Dakota Registered Agent.co: pricing and service pages, copied November 12, 2026
  11. From Mainstay Filing: South Dakota service page, copied November 12, 2026
  12. From SD Registered Agent.org: pricing and service pages, copied November 12, 2026