Best LLC Service by State

Best LLC Service by State › South Dakota

Best LLC Formation Service in South Dakota (2026): Year-One and Year-Two Cost Compared

Our pick: Mainstay Filing. $199 a year covers forming your South Dakota LLC, your registered agent all year, your EIN application and your South Dakota annual report, and it renews at the same $199. South Dakota’s filing fee ($150, set by the South Dakota Secretary of State) is passed through at cost.

  • Official sources, checked October 20, 2026
  • Provider prices checked October 2026
Our pick in South Dakota

Mainstay Filing

Our rating: 4.9 out of 5

$199 / year + $150 state fee

  • LLC formation, prepared and filed
  • Registered agent, all year
  • EIN application (with an SSN or ITIN)
  • Annual report filed every year it is due where the state requires one
  • Compliance reminders and stored documents

Price from the Mainstay Filing pricing and FAQ pages, checked October 21, 2026. State fees are passed through at cost and shown before you pay.

Year-one and year-two cost in South Dakota

South Dakota figures include the $150 state filing fee in year 1 and the $55 report fee in the years it is due. Provider prices checked October 2026. Mainstay Filing includes the annual-report filing in its price; where a competitor charges for it, that charge is in its “included” cell, not in the totals.
ProviderYear 1Year 23-year totalWhat the price coversRenewal terms
Mainstay Filing$349$254$857Formation filing, registered agent, EIN application and every annual report filed$199 a year, the same at renewal
Northwest Registered Agent$189$180$549Formation; agent included year 1; annual report filing is an extra $100 plus the state fee$125 a year
ZenBusiness$249$254$757Starter formation; agent bought separately; Pro ($199 a year) adds EIN and annual-report filing$199 a year agent
Bizee$150$204$558Basic formation with a free first year of its agent; Standard is $199 and Premium $299$149 a year agent
LegalZoom$399$304$1,007Basic formation; agent bought separately at $249 for first-time agent customers (Pro $249, Premium $299)$249 a year agent

Which service fits which owner

Side hustle

The worry is what the LLC costs you every year while the income is small. Here that is $199 with Mainstay Filing plus $55 to South Dakota Secretary of State when the report is due. Bizee is lower in year 1 ($150 against $349), but check its year-2 cell before you take the saving.

First-time owner

Most of the work comes after the filing: the EIN, an operating agreement, an agent address and the Annual Report, due Due during the entity's anniversary month each year. Mainstay Filing prepares and files the formation and the report, applies for the EIN, and has no operating-agreement upcharge.

Online business

You will probably be asked for a business address by a bank or a payment processor. The registered agent address is on the public record and is not a business mailing address; Mainstay Filing says its address can’t stand in for one, so plan a separate mailing address. Required registered agent in South Dakota: 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.

Startup with co-founders

Two things to settle before filing: who owns what, in an operating agreement, and who is responsible for the yearly paperwork. With Mainstay Filing the agreement is not an extra charge and the report is filed for you, so the $857 three-year figure above is the whole budget apart from legal advice you choose to buy.

Non-US owner

Mainstay Filing applies for the EIN as part of formation. It charges a one-time $99 for founders with no SSN or ITIN (a faxed Form SS-4), on top of the $199 and the $150 South Dakota filing fee.

South Dakota facts

Filing
Articles of Organization, $150, filed with the South Dakota Secretary of State
Yearly report
Annual Report, every year, $55 Due: Due during the entity's anniversary month each year.
Registered agent
Required. Every LLC must name a registered agent with an in-state street address.

Should you file it yourself?

You can. File the Articles of Organization with the South Dakota Secretary of State for $150, get the EIN free from the IRS, name a registered agent (you may serve as your own if you meet the address rule), and calendarthe Annual Report. What a service adds is the address on the public record, the reminders and a single yearly price. The steps and what is left after filing.

Questions

Do I need an operating agreement in South Dakota?

Whether South Dakota requires one is a legal point we have not checked state by state; with more than one owner, a written agreement settles who decides what. Mainstay Filing does not charge extra for one.

Can I be my own registered agent in South Dakota?

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. If you meet that rule you can, and the cost is $0 plus the address on the public record.

What does an LLC cost after year one in South Dakota?

Mainstay Filing: $199 plus the $55 state report fee in year 2. The others vary: Northwest Registered Agent $180, ZenBusiness $254, Bizee $204, LegalZoom $304.

Sources