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LLC formation worksheets · South Dakota

3 Best LLC Services in South Dakota (2026): Worked Prices

After the sums, Mainstay Filing ($199), South Dakota Registered Agent.co ($199) and SD Registered Agent.org ($199) lead the 2026 South Dakota table of LLC formation services, in that order. The service rows total $397 to $597 over three years; South Dakota separately charges $150 to file, whoever does it.
Worked by the Formation Math editorial team

↓ Sorted by: Score = 42% three-year total + 28% coverage + three smaller terms (details)

South Dakota in brief

Formation fee $150 sdlegislature.gov (checked October 2026) as the source
Year 1 spread $199 Provider charges only
Totals after three years $397 to $597 Opening price and two renewals
Government total, 3 years $260 The same whoever files
Break-even year Does not occur The order stays put for ten years

Rows ranked by value

Prices are copied from each company's own pricing. The $150 state fee is added separately.

1
Highest score

1. Mainstay Filing: best for a cost that stays flat

$199 per year, renewing at $199
Year-1 price $199
Price after year 1 $199/yr
Sum of 3 years $597

Mainstay Filing comes out on top. Working: $199 a year pays for the filing, the registered agent and the annual report, so year two is $199 again.

The $200 three-year premium over South Dakota Registered Agent.co buys coverage, and coverage decides this ranking.

Each annual report is part of the service, with the state's $55 billed at cost.

The price buys

  • Formation paperwork, done for you
  • Registered agent, covered all year
  • Annual report, filed when due
  • EIN application, handled
  • The official fee, nothing added

Adds up

  • $199 in year two
  • $199 for the whole bundle
  • EIN application covered

Does not add up

  • $100 more per year than South Dakota Registered Agent.co after year one
2
South Dakota only

2. South Dakota Registered Agent.co: best for companies that will stay in one state

$199 to form, $99 each year after
Year-1 price $199
Price after year 1 $99/yr
Sum of 3 years $397

Next in the working, South Dakota Registered Agent.co: $199 the first year, $99 for every year after.

Allow time for the annual report; it is not covered.

The price buys

  • Formation handled start to finish
  • Year-one agent service

Adds up

  • A small $99 renewal
  • First agent year included
  • Formation priced at $199

Does not add up

  • Filing the annual report is left to you
  • An EIN add-on at $99
3
South Dakota only

3. SD Registered Agent.org: best for a small agent renewal

$199 to form, $99 each year after
Year-1 price $199
Price after year 1 $99/yr
Sum of 3 years $397

Next in the working, SD Registered Agent.org: $199 the first year, $99 for every year after.

Allow time for the annual report; it is not covered.

No difference in price from South Dakota Registered Agent.co.

The price buys

  • Formation handled start to finish
  • Year-one agent service

Adds up

  • First agent year included
  • Formation priced at $199
  • A small $99 renewal

Does not add up

  • Filing the annual report is left to you
  • An EIN add-on at $99

Cumulative cost, year by year

No. Provider Year 1 total Total at year 2 Total at year 3 Total at year 5
1 Mainstay Filing $199 $398 $597 $995 Visit Mainstay Filing Partner link. We may earn money if you buy.
2 South Dakota Registered Agent.co $199 $298 $397 $595 Visit South Dakota Registered Agent.co Partner link. We may earn money if you buy.
3 SD Registered Agent.org $199 $298 $397 $595 Visit SD Registered Agent.org Partner link. We may earn money if you buy.

Year one plus renewals, from the prices read on November 13, 2026. The ranking by running sum is stable for ten years.

Worksheet calculator

Sums for 1 to 5 years, EIN application optional. State fees are left out because they match in every row.

Adding up 3 years: Mainstay Filing $597, South Dakota Registered Agent.co $397, SD Registered Agent.org $397. Lowest total at that point: South Dakota Registered Agent.co.

Official state amounts

Term Value Where it comes from
LLC formation filing $150 sdlegislature.gov (checked October 2026) as the source
Annual report $55 every year sdlegislature.gov (checked October 2026) as the source
Penalty if the report is late $50 sdlegislature.gov (checked October 2026) as the source
Sum of state fees, years 1 to 3 $260 Our addition

Working: filing fee, plus the recurring report in years two and three, plus any minimum tax. The sum is the three-year state line.

How the ranking worked out

For South Dakota, the term that decided it was items covered per dollar (28% of the score), where Mainstay Filing came out ahead.

South Dakota Registered Agent.co totals less over three years but leaves the annual report with you.

EIN application included, break-even comes in year 2, when Mainstay Filing passes South Dakota Registered Agent.co.

South Dakota LLC filing fee and rules, from the source

The LLC exists once the South Dakota Secretary of State accepts the Articles of Organization along with $150. Every LLC must name a registered agent with an in-state street address.

Quoted from: sdlegislature.gov (checked October 2026) as the source

The state-fees-only case

Do it yourself and only state fees remain, $260 over three years. The service rows add $397 to $597 for the paperwork and the agent.

South Dakota price questions, answered

What does an LLC formation service cost in South Dakota?

$199 for year one across our rows, plus the state's $150 fee.

What do the services add up to over three years?

$397 to $597 across the rows, not counting state fees.

What is the South Dakota fee to file an LLC?

Filing costs $150, and you submit the Articles of Organization.

What does South Dakota collect each year after formation?

Expect $55 every year when the annual report is filed (due during the entity's anniversary month).

Does the price include the EIN application?

Each row differs: Mainstay Filing (included), South Dakota Registered Agent.co ($99) and SD Registered Agent.org ($99).

In what year does one service pass another in total cost?

The rows do not cross in the first ten years.

Which LLC formation service is best value in South Dakota?

By the five-part score the South Dakota rows run Mainstay Filing, South Dakota Registered Agent.co and SD Registered Agent.org, led by Mainstay Filing on items covered per dollar.

Next worksheets

LLC formation worksheets, all 50 states Best LLC services overall The method

Inputs and sources

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