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Quick answer · South Dakota

3 Best LLC Services in South Dakota (2026), Ranked

Best LLC formation services in South Dakota for 2026: South Dakota Registered Agent.co ($199), Mainstay Filing ($199) and SD Registered Agent.org ($199), ranked in that order. State fee: $150. Services over three years: $397 to $597.

LLC Q and A editorial team ·

At a glance

State filing fee
$150, one time
Then
$55 yearly
Registered agent
Yes, the statute demands one
Pick
South Dakota Registered Agent.co, Mainstay Filing then SD Registered Agent.org

South Dakota ranking

Prices come from each company's own page. See the method.
1#1 pick

1. South Dakota Registered Agent.co: best for a one-state LLC

Form for $199; renew at $99 a year

#1 in South Dakota: South Dakota Registered Agent.co, because formation is $199 with the agent covered in year one, then $99 a year.

On three-year cost it beats Mainstay Filing, and cost counts most.

The annual report is excluded, so you file it.

Price covers

  • South Dakota formation filing
  • Agent for year one

For

  • Agent free at the start
  • $199 plus state fee to form
  • Agent renews at $99

Against

  • The annual report falls to you
  • $99 charge for the EIN application
South Dakota Registered Agent.co sitePartner link. We may earn money if you buy.
2All fifty states

2. Mainstay Filing: best for one price for formation and upkeep

Annual price $199, renewal price $199, state fee extra

Mainstay Filing ranks second since the annual report is filed inside the $199 annual price, with formation and the registered agent.

Ranked lower because three years cost $200 more than South Dakota Registered Agent.co, and cost has the biggest weight.

Annual report filing is included. The state's $55 is the only addition, at cost.

Price covers

  • Formation filed with the state
  • Registered agent for a year
  • Annual report filed
  • EIN application
  • State fees at cost

For

  • Renewal holds at $199
  • No fee for the EIN application
  • One fee, $199 a year

Against

  • Pays $100 more each year than South Dakota Registered Agent.co
Mainstay Filing sitePartner link. We may earn money if you buy.
3South Dakota specialist

3. SD Registered Agent.org: best for another local option

Form for $199; renew at $99 a year

SD Registered Agent.org ranks third since formation is $199 with the agent covered in year one, then $99 a year.

The annual report is excluded, so you file it.

Same published prices as South Dakota Registered Agent.co, so the order between them is close.

Price covers

  • South Dakota formation filing
  • Agent for year one

For

  • Agent free at the start
  • Agent renews at $99
  • $199 plus state fee to form

Against

  • The annual report falls to you
  • $99 charge for the EIN application
SD Registered Agent.org sitePartner link. We may earn money if you buy.

Comparison

#ServiceYear 1RenewalTotal, 3 yearsCovers
1South Dakota Registered Agent.co$199$99/yr$397South Dakota formation filing; agent for year oneSouth Dakota Registered Agent.co sitePartner link. We may earn money if you buy.
2Mainstay Filing$199$199/yr$597formation filed with the state; registered agent for a year; annual report filedMainstay Filing sitePartner link. We may earn money if you buy.
3SD Registered Agent.org$199$99/yr$397South Dakota formation filing; agent for year oneSD Registered Agent.org sitePartner link. We may earn money if you buy.
Service fees only, from company price pages read November 13, 2026. State fees are identical for every pick.

Questions and replies

How much to start an LLC in this state?

State fee $150; add $199 for first-year service.

With the recurring report, state fees total $260 over three years. sdlegislature.gov (October 2026) is the source of record

Which form, filed where?

Approval of one filing creates the LLC: the Articles of Organization, lodged at the South Dakota Secretary of State.

State processing time: Paper 1 to 3 business days; online processed immediately. sdlegislature.gov (October 2026) is the source of record

Must the LLC name a registered agent?

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

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.

sdlegislature.gov (October 2026) is the source of record

Later-year obligations?

Annual report: every year, $55. For timing, the state's own calendar reads: due during the entity's anniversary month, so plan ahead of it.

A late filing adds $50.

sdlegislature.gov (October 2026) is the source of record

Can I do it myself?

Yes; your three-year bill would be the state's $260.

A service adds $397 to $597 over three years; with Mainstay Filing the reports are in that price.

What decided #1?

South Dakota Registered Agent.co scores best on three-year price, which is 36% of the total.

Five criteria: three-year price (36%), chores removed from your list (26%), price shown up front (15%), year-two bill (12%) and states served (11%).

South Dakota Registered Agent.co wins on cost: $397, a $200 saving over Mainstay Filing.

The five criteria

What South Dakota requires to form an LLC

RequirementRule or amountOfficial page
LLC filing fee$150sdlegislature.gov (October 2026) is the source of record
Registered agentYes, the statute demands onesdlegislature.gov (October 2026) is the source of record
Annual report$55 every yearsdlegislature.gov (October 2026) is the source of record
State fees, 3 years$260Total of the rows above
Rows link to official sources; the final row is our own addition of filing, two reports and any minimum tax.

More replies

Processing time?

Paper 1 to 3 business days; online processed immediately.

EIN application included?

Mainstay Filing includes it. Others charge: South Dakota Registered Agent.co $99; SD Registered Agent.org $99.

Late fee for the report?

A late report costs $50 more.

Three-year cost of each?

Totals over three years: South Dakota Registered Agent.co at $397, Mainstay Filing at $597, SD Registered Agent.org at $397, before state fees.

Where do the numbers come from?

Official South Dakota sources for the state side, published prices for the service side.

Which LLC service should I use in South Dakota?

South Dakota Registered Agent.co: $199 forms the LLC and the agent renews at $99. Behind it: Mainstay Filing and SD Registered Agent.org.

Sources

  1. Reference line for South Dakota Secretary of State, drawn from sdsos.gov and confirmed August 2026, as noted by our editors
  2. Reference line for South Dakota Secretary of State, drawn from sosenterprise.sd.gov and confirmed August 2026, as noted by our editors
  3. Reference line for South Dakota yearly filing: Annual, drawn from sdlegislature.gov and confirmed October 2026, as noted by our editors
  4. Reference line for South Dakota report due date, drawn from sdlegislature.gov and confirmed August 2026, as noted by our editors
  5. Reference line for SDCL 47-34A-203, drawn from sdlegislature.gov and confirmed August 2026, as noted by our editors
  6. Reference line for South Dakota formation fee: Filing, drawn from sdsos.gov and confirmed October 2026, as noted by our editors
  7. Reference line for South Dakota formation fee: Filing, drawn from sdlegislature.gov and confirmed October 2026, as noted by our editors
  8. Reference line for South Dakota registered agent statute, drawn from sdlegislature.gov and confirmed October 2026, as noted by our editors
  9. Reference line for Processing, official source, drawn from sdsos.gov and confirmed October 2026, as noted by our editors
  10. Price page: South Dakota Registered Agent.co pricing page, accessed November 13, 2026
  11. Price page: Mainstay Filing South Dakota service page, accessed November 13, 2026
  12. Price page: SD Registered Agent.org pricing page, accessed November 13, 2026