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LLC formation cost calculators + South Dakota

3 Best LLC Services in South Dakota (2026): Cost Calculator

The 2026 result for South Dakota LLC formation services: South Dakota Registered Agent.co ($199), Mainstay Filing ($199) and SD Registered Agent.org ($199), ranked best value first. Result range for service fees over three years: $397 to $597. Add $150 for filing in South Dakota.
Calculated by the Formation Calc editorial team

Result order: The result is 41% three-year cost and 27% filing work covered, with renewal change, break-even year and input clarity filling in the rest. The formula

Main figures

Filing fee$150sdlegislature.gov {input read October 2026, shown in full}
First-year outputs$199State fee not in these
Three-year outputs$397 to $597Renewals included
State fees by year three$260Equal for every provider
Totals cross atNone in ten yearsRanking steady to year 10

South Dakota results

Every input is copied from the company's own pricing page. The $150 state fee has to be added separately.
1

1. South Dakota Registered Agent.co: best for the smallest three-year result

Leads the results
Year-1 input$199
Input for year 2 on$99/yr
Result at year 3$397
Input $199; later years $99

Top result: South Dakota Registered Agent.co. $199 for year one, then $99 for every year after.

A lower three-year result than Mainstay Filing puts it first, since cost weighs most.

Its input does not include the annual report.

Inputs covered

  • Formation paperwork, completed
  • Agent service for the first year

Adds up well

  • No agent charge in year one
  • $199 to form
  • Then $99 a year

Adds up badly

  • Nothing in the price pays for the annual report
  • It bills $99 for the EIN application
2

2. Mainstay Filing: best for one input covering formation and upkeep

Nationwide
Year-1 input$199
Input for year 2 on$199/yr
Result at year 3$597
$199 a year plus the $150 state fee

Result 2: Mainstay Filing. One $199 input includes formation, registered agent service and every annual report.

Its three-year result is $200 above South Dakota Registered Agent.co's, and cost is 41% of the formula.

No annual report for you to file; the only extra is the state's $55.

Inputs covered

  • Formation delivered to the state office
  • Registered agent for the full year
  • Annual report, filed when due
  • EIN application prepared
  • State fee at cost

Adds up well

  • $199 a year covers filing and agent and report
  • The same $199 after year one
  • No extra fee for the EIN application

Adds up badly

  • South Dakota Registered Agent.co renews for $100 less
3

3. SD Registered Agent.org: best for a local formation service

South Dakota only
Year-1 input$199
Input for year 2 on$99/yr
Result at year 3$397
Input $199; later years $99

SD Registered Agent.org holds position 3 because $199 for year one, then $99 for every year after.

Its input does not include the annual report.

Input for input, it ties South Dakota Registered Agent.co.

Inputs covered

  • Formation paperwork, completed
  • Agent service for the first year

Adds up well

  • $199 to form
  • Then $99 a year
  • No agent charge in year one

Adds up badly

  • Nothing in the price pays for the annual report
  • It bills $99 for the EIN application

Results over time

RankServiceResult, year 1Result, year 2Result, year 3Result, year 5
1South Dakota Registered Agent.co$199$298$397$595Open South Dakota Registered Agent.coPartner link. We may earn money if you buy.
2Mainstay Filing$199$398$597$995Open Mainstay FilingPartner link. We may earn money if you buy.
3SD Registered Agent.org$199$298$397$595Open SD Registered Agent.orgPartner link. We may earn money if you buy.
Service fees only, calculated from each company's prices as of November 13, 2026. None of the totals cross in ten years.

Try other years

How long will the company stay open? Enter the years and compare, with the EIN application as an option.
Running total over 3 years: South Dakota Registered Agent.co $397, Mainstay Filing $597, SD Registered Agent.org $397. Least paid: South Dakota Registered Agent.co.

South Dakota fee list

InputAmountSource
Formation charge$150sdlegislature.gov {input read October 2026, shown in full}
Annual report$55 every yearsdlegislature.gov {input read October 2026, shown in full}
Cost of missing the deadline$50sdlegislature.gov {input read October 2026, shown in full}
State fees summed, years 1 to 3$260Calculated from the inputs above
State result = filing fee + the two later reports + any minimum tax. Open-ended costs get a mention but no number.

The working behind South Dakota

South Dakota Registered Agent.co did better than Mainstay Filing on calculated three-year cost, a 41% term.

Three years with South Dakota Registered Agent.co sum to $397, a result $200 better than Mainstay Filing.

If the EIN application is needed, the results cross in year 2, as Mainstay Filing moves past South Dakota Registered Agent.co.

How South Dakota describes its LLC filing fee and filing requirements

You submit the Articles of Organization to the South Dakota Secretary of State along with $150. Every LLC must name a registered agent with an in-state street address.

As written: sdlegislature.gov {input read October 2026, shown in full}

Without a service

Without a service the three-year input is just $260 in state fees. Hiring help adds $397 to $597 to it.

Questions

What do LLC formation services cost in South Dakota?

$199 in year one across these services, plus the state's $150 filing fee.

What do these services calculate to over three years?

Anywhere from $397 to $597 for three years of service.

How much does South Dakota charge to file an LLC?

South Dakota bills $150 for the Articles of Organization.

What does South Dakota charge each year after formation?

Plug in $55 every year for the annual report, due due during the entity's anniversary month.

Is the EIN application part of the price?

South Dakota Registered Agent.co, plus $99, Mainstay Filing, nothing added and SD Registered Agent.org, plus $99.

When does one service pass another in total cost?

No crossing within ten years; no service passes another.

Which LLC formation service calculates best in South Dakota?

Ranked results: South Dakota Registered Agent.co, Mainstay Filing and SD Registered Agent.org.

Keep comparing

Input sources

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