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Business Basics LabLLC paperwork, measured state by state.

Lab sheet 2 · South Dakota

The South Dakota Registered Agent (2026): 6 Procedures and the 3 Best Agents

Result for 2026: appointing a registered agent in South Dakota is best served by Mainstay Filing ($149 a year), SD Registered Agent.org ($99 a year) and South Dakota Registered Agent.co ($99 a year), ranked in that order. Procedure 1 records what South Dakota law says about a registered agent; by procedure 6 the appointment is on file.

Recorded by the Business Basics Lab staff ·

Sheet summary

Mandatory?
YesReference sdlegislature.gov, October 2026
Agent service
$99 to $149 a yearListed prices
Annual report
$55 a yearReference sdlegislature.gov, October 2026
Procedures
6One at a time

Aims of this sheet

  • Why South Dakota requires an agent on file
  • Who may serve and from where
  • Naming the agent with the state
  • How the ranked agents compare

Best reading

The South Dakota results

Cost over three years comes first, then procedures performed, renewal, South Dakota fit and price legibility (method page).
Best overall

1. Mainstay Filing: best for owners planning expansion

Year 1 $149; year 2 $149

Top of the South Dakota readings is Mainstay Filing: $149 a year, and the reading is unchanged for states added later.

Three years run $150 higher than at SD Registered Agent.org, in exchange for more of the work being done.

What the price performs

  • A South Dakota street address on record
  • Papers served on the company are scanned free on the same business day
  • Three government letters a year are scanned at no charge
  • Also serves nonprofits, corporations, LPs and LLPs

Measured strengths

  • $149 annually
  • One provider everywhere

Measured limits

  • Costs $50 more every year
  • Report filing requires the formation package
Visit Mainstay FilingPartner link. We may earn money if you buy.
South Dakota focus

2. SD Registered Agent.org: best for LLCs that never leave South Dakota

Year 1 $99; year 2 $99

Reading 2 belongs to SD Registered Agent.org, because a one-state plan reading $99 a year and $99 at renewal.

What the price performs

  • A registered office address
  • Scans of served papers

Measured strengths

  • A flat $99 per year
  • Below Mainstay Filing on price

Measured limits

  • South Dakota only; every other state needs its own agent
  • The annual report is left for the owner to complete
Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
South Dakota focus

3. South Dakota Registered Agent.co: best for a local alternative

Year 1 $99; year 2 $99

Reading 3 belongs to South Dakota Registered Agent.co, because a one-state plan reading $99 a year and $99 at renewal.

Its prices equal SD Registered Agent.org's, so either is acceptable.

What the price performs

  • A registered office address
  • Scans of served papers

Measured strengths

  • A flat $99 per year
  • Below Mainstay Filing on price

Measured limits

  • South Dakota only; every other state needs its own agent
  • The annual report is left for the owner to complete
Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.

Prices in one table

#ServiceAnnual priceRenewal priceThree-year total
1Mainstay Filing$149$149/yr$447Visit Mainstay FilingPartner link. We may earn money if you buy.
2SD Registered Agent.org$99$99/yr$297Visit SD Registered Agent.orgPartner link. We may earn money if you buy.
3South Dakota Registered Agent.co$99$99/yr$297Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy.
Prices are recorded from each company's own site on November 13, 2026. Changing agent leaves state fees unchanged.

The sheet, procedure by procedure

  1. Procedure 1: Record the requirement

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

    Specimen: Reference sdlegislature.gov, October 2026

  2. Procedure 2: Who can take the role

    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. Statutory basis: SDCL 59-11-6.

  3. Procedure 3: Use a qualifying office address

    The address has to be an actual street address or rural route box number in South Dakota, plus a South Dakota mailing address if it differs.

    TipA service supplies a South Dakota street address, which keeps the owner's address off the filing.

  4. Procedure 4: Decide who fills the role

    Eligible owners may name themselves, and the ranked agents charge $99 to $149 annually.

  5. Procedure 5: Name the agent in the filing

    New companies list the agent on the Articles of Organization; a later replacement means a new filing with the South Dakota Secretary of State.

    Specimen: Reference sdlegislature.gov, October 2026

  6. Procedure 6: Maintain accurate details

    State correspondence about the annual report arrives with the registered agent. Its price is $55 every year, with the due date given as due during the entity's anniversary month.

    Specimen: Reference sdlegislature.gov, October 2026

Agent and state costs

ProcedurePaid toCost
A professional agentService$99 to $149 a year
Each later yearService$99 to $149 a year
Annual reportState$55 every year
Every state amount here can be verified against the specimens below. The three-year row combines formation, two later reports and a minimum tax where one exists, and it never includes service prices.

How the readings worked out

prevailed on procedures the price performs (28% of the reading), with close behind.

Coverage placed it ahead of SD Registered Agent.org.

South Dakota questions

Does South Dakota law require a registered agent for an LLC?

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

Can I be my own registered agent?

Yes, when the eligibility and address tests in procedures 2 and 3 are met.

Can I change my registered agent later?

A change is permitted whenever wanted, through the South Dakota Secretary of State, as procedure 5 describes.

What does a registered agent cost in South Dakota?

From $99 to $149 a year on this sheet.

What does the LLC pay the state each year?

The LLC files the annual report for $55 every year.

Which registered agent would you choose?

Select Mainstay Filing: the agent price is $149 a year in every state. Then SD Registered Agent.org and South Dakota Registered Agent.co.

Further reading

Specimens and records

  1. Notebook entry for South Dakota Secretary of State, Business Services /: the observations rest on sdsos.gov, revisited in August 2026. Replicate the check by opening that page.
  2. Notebook entry for South Dakota Secretary of State, Business Services /: the observations rest on sosenterprise.sd.gov, revisited in August 2026. Replicate the check by opening that page.
  3. Notebook entry for South Dakota yearly filing: Annual report: fee and: the observations rest on sdlegislature.gov, revisited in October 2026. Replicate the check by opening that page.
  4. Notebook entry for South Dakota report due date: the observations rest on sdlegislature.gov, revisited in August 2026. Replicate the check by opening that page.
  5. Notebook entry for SDCL 47-34A-203: the observations rest on sdlegislature.gov, revisited in August 2026. Replicate the check by opening that page.
  6. Notebook entry for South Dakota formation fee: Filing fee, official source: the observations rest on sdsos.gov, revisited in October 2026. Replicate the check by opening that page.
  7. Notebook entry for South Dakota formation fee: Filing fee, official source: the observations rest on sdlegislature.gov, revisited in October 2026. Replicate the check by opening that page.
  8. Notebook entry for South Dakota registered agent statute: the observations rest on sdlegislature.gov, revisited in October 2026. Replicate the check by opening that page.
  9. Mainstay Filing South Dakota service page, recorded November 13, 2026
  10. SD Registered Agent.org pricing page, recorded November 13, 2026
  11. South Dakota Registered Agent.co pricing page, recorded November 13, 2026