Lesson 2 · South Dakota
Registered Agent in South Dakota (2026): a 6-Step Lesson and the 3 Best Agents
The short version
You will be able to
- Why South Dakota wants an agent on file
- The address and eligibility rules
- Recording the agent
- The agents we recommend
The South Dakota services we recommend
1. SD Registered Agent.org: best for South Dakota founders
SD Registered Agent.org gets our top grade for South Dakota: $99 a year buys a South Dakota agent with an office in the state.
Mainstay Filing costs more over three years, and that hands this service the top spot.
What the price covers
- A physical South Dakota address
- Served documents posted online
Marks in its favor
- Annual price $99, renewal price $99
- A smaller yearly bill than Mainstay Filing
Where it loses points
- A one-state service
- No help with the annual report
2. Mainstay Filing: best for companies in several states
Mainstay Filing lands in second place, and the reason is clear: a flat yearly price of $149 no matter which state the LLC is in.
On three-year cost it falls $150 behind SD Registered Agent.org.
What the price covers
- A registered office address in South Dakota
- A same-business-day scan of each served paper comes at no charge
- Government mail scanned free, three pieces a year
- Also works for nonprofits, corporations, LPs and LLPs
Marks in its favor
- Works in every state
- $149 a year
Where it loses points
- $50 more per year than the local pick
- Report filing needs the formation package
3. South Dakota Registered Agent.co: best for a second local option
For number 3 we picked South Dakota Registered Agent.co: $99 a year buys a South Dakota agent with an office in the state.
It posts the same prices as SD Registered Agent.org.
What the price covers
- A physical South Dakota address
- Served documents posted online
Marks in its favor
- A smaller yearly bill than Mainstay Filing
- Annual price $99, renewal price $99
Where it loses points
- A one-state service
- No help with the annual report
Our South Dakota picks side by side
| # | Service | Annual price | Renewal price | Three-year total | |
|---|---|---|---|---|---|
| 1 | SD Registered Agent.org | $99 | $99/yr | $297 | Visit SD Registered Agent.orgPartner link. We may earn money if you buy. |
| 2 | Mainstay Filing | $149 | $149/yr | $447 | Visit Mainstay FilingPartner link. We may earn money if you buy. |
| 3 | South Dakota Registered Agent.co | $99 | $99/yr | $297 | Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy. |
The lesson, step by step
-
Step
1Learn what South Dakota requires
Every LLC must name a registered agent with an in-state street address.
Where this comes from: Look it up at sdlegislature.gov; last checked October 2026
-
Step
2Find out who can serve
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. See SDCL 59-11-6.
-
Step
3Use an address that qualifies
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.
Every pick on our list provides the South Dakota office address.
-
Step
4Settle who will be the agent
Qualified owners may act as their own agent. Otherwise our graded picks charge $99 to $149 per year.
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Step
5List the agent with the state
A new LLC names its agent in the Articles of Organization sent to the South Dakota Secretary of State. An existing LLC that wants a different agent files a change with that same office.
Where this comes from: Look it up at sdlegislature.gov; last checked October 2026
-
Step
6Keep the agent information current
Your registered agent receives the state's mail about the annual report, a filing that is $55 every year and due due during the entity's anniversary month.
Where this comes from: Look it up at sdlegislature.gov; last checked October 2026
The cost of this lesson
| Step | Paid to | Cost |
|---|---|---|
| Registered agent service | Your service | $99 to $149 a year |
| From year two | Your service | $99 to $149 a year |
| Annual report | The state | $55 every year |
Behind the ranking
won on tuition over three years (32% of the grade), with right behind.
Paying SD Registered Agent.org for three years adds up to $297, which is $150 below the Mainstay Filing total.
Short answers
Must a South Dakota LLC have a registered agent?
Yes. Every LLC must name a registered agent with an in-state street address.
Can I be my own registered agent?
Yes, as long as you pass the tests for who may serve and for the address, which steps 2 and 3 go through.
Can I change my registered agent later?
Yes, at any time. Step 5 shows how to file the change with the South Dakota Secretary of State.
What does a registered agent cost in South Dakota?
$99 to $149 per year for the agents we graded.
What does the LLC pay the state each year?
The recurring state cost is the annual report at $55 every year.
Which registered agent would you choose?
SD Registered Agent.org: $99 a year with no jump at renewal, for an LLC that stays in South Dakota. Then come Mainstay Filing and South Dakota Registered Agent.co.
Class references
- Homework check for South Dakota Secretary of State, Business Services /: the facts come from sdsos.gov, a page we last confirmed in August 2026, so you can compare our notes to the original.
- Homework check for South Dakota Secretary of State, Business Services /: the facts come from sosenterprise.sd.gov, a page we last confirmed in August 2026, so you can compare our notes to the original.
- Homework check for South Dakota yearly filing: Annual report: fee and: the facts come from sdlegislature.gov, a page we last confirmed in October 2026, so you can compare our notes to the original.
- Homework check for South Dakota report due date: the facts come from sdlegislature.gov, a page we last confirmed in August 2026, so you can compare our notes to the original.
- Homework check for SDCL 47-34A-203: the facts come from sdlegislature.gov, a page we last confirmed in August 2026, so you can compare our notes to the original.
- Homework check for South Dakota formation fee: Filing fee, official source: the facts come from sdsos.gov, a page we last confirmed in October 2026, so you can compare our notes to the original.
- Homework check for South Dakota formation fee: Filing fee, official source: the facts come from sdlegislature.gov, a page we last confirmed in October 2026, so you can compare our notes to the original.
- Homework check for South Dakota registered agent statute: the facts come from sdlegislature.gov, a page we last confirmed in October 2026, so you can compare our notes to the original.
- On November 13, 2026 we read the pricing page of SD Registered Agent.org
- On November 13, 2026 we read the South Dakota service page of Mainstay Filing
- On November 13, 2026 we read the pricing page of South Dakota Registered Agent.co