Step by step · South Dakota
3 Best Registered Agents in South Dakota (2026), Compared
Quick explanation
- Must you have one?
- Mandatory
- Legal title
- Registered agent
- Cost per year
- $99 to $149 each year
- Our recommendations
- SD Registered Agent.org, South Dakota Registered Agent.co then Mainstay Filing
South Dakota: the ranked picks
Best first. See how we pick for the reasoning.1. SD Registered Agent.org: best for LLCs staying in one state
$99 in year one and $99 when renewed
SD Registered Agent.org comes out on top: three years total $297 for a company that never leaves South Dakota.
A lower three-year total than Mainstay Filing gives it the lead for a company that stays put.
Includes
- The registered office address
- Online access to scanned documents
Points in its favor
- A lower annual price than Mainstay Filing
- A fixed $99 each year
Where it falls short
- Nothing outside this state
- The annual report is left to you to file
2. South Dakota Registered Agent.co: best for local support
$99 in year one and $99 when renewed
South Dakota Registered Agent.co ranks second. In short, three years total $297 for a company that never leaves South Dakota.
With the same prices as SD Registered Agent.org, this is a near tie.
Includes
- The registered office address
- Online access to scanned documents
Points in its favor
- A fixed $99 each year
- A lower annual price than Mainstay Filing
Where it falls short
- Nothing outside this state
- The annual report is left to you to file
3. Mainstay Filing: best for owners planning to grow
$149 in year one and $149 when renewed
In third place is Mainstay Filing, because the $149 yearly price is identical across states.
That $150 gap over three years explains why it ranks below SD Registered Agent.org.
Includes
- An in-state street address
- Up to three government mailings a year scanned for free
- Serves LLCs, corporations, LPs, LLPs and nonprofits
Points in its favor
- A fixed $149 each year
- Follows the company across states
Where it falls short
- Costs $50 more annually
- The agent role is all you get
Numbers side by side
| # | Pick | Opening price | Each year after | Three-year total | Included in the price | |
|---|---|---|---|---|---|---|
| 1 | SD Registered Agent.org | $99 | $99/yr | $297 | the registered office address; online access to scanned documents | Check SD Registered Agent.orgPartner link. We may earn money if you buy. |
| 2 | South Dakota Registered Agent.co | $99 | $99/yr | $297 | the registered office address; online access to scanned documents | Check South Dakota Registered Agent.coPartner link. We may earn money if you buy. |
| 3 | Mainstay Filing | $149 | $149/yr | $447 | An in-state street address; up to three government mailings a year scanned for free; Serves LLCs, corporations, LPs, LLPs and nonprofits | Check Mainstay FilingPartner link. We may earn money if you buy. |
Questions explained
Does the law insist on a registered agent?
Every LLC must name a registered agent with an in-state street address.
Legal basis: SDCL 59-11-6. (sdlegislature.gov, October 2026)
Can just anyone act as agent?
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 the rule, you may name yourself and avoid paying an agent.
What do agents cost?
Prices start at $99 to $149 a year and total $297 to $447 for three.
Choosing a different agent does not change any state fee.
Why does the state require one?
It takes delivery of legal papers and state notices for the company in South Dakota.
That is the reason the address has to be staffed during business hours. Understanding service of process
What does the LLC owe the state every year?
Plan on $55 every year for the annual report. The state sets the deadline as due during the entity's anniversary month; put it in your calendar.
(sdlegislature.gov, October 2026)
How did you order the services?
SD Registered Agent.org leads on what three years cost, a criterion that carries 34% of the weight.
The two heaviest criteria are what three years cost (34%) and how much work the price handles (28%), with three lighter ones behind them.
Picking SD Registered Agent.org leaves $150 in your pocket after three years compared with Mainstay Filing.
What South Dakota requires
| Requirement | Fee or rule | Official source |
|---|---|---|
| Fee to file the LLC | $150 | (sdlegislature.gov, October 2026) |
| Registered agent | Mandatory | (sdlegislature.gov, October 2026) |
| Annual report | $55 every year | (sdlegislature.gov, October 2026) |
| Paid to the state in three years | $260 | Sum of the figures above |
Further questions
Can I serve as the agent myself?
Usually. Check the two rules above: who qualifies and the address.
What kind of address does the agent need?
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.
How much is each one after three years?
SD Registered Agent.org at $297, South Dakota Registered Agent.co at $297, Mainstay Filing at $447
Are the figures official?
The state side uses South Dakota's own publications. The service side uses published company prices.
Is a service required?
No. The state takes filings from owners directly; a service just saves time and covers the agent role.
Which registered agent do you recommend in South Dakota?
We would start with SD Registered Agent.org, then South Dakota Registered Agent.co and Mainstay Filing.
Documents and pricing pages behind this page
- South Dakota Secretary of State via sdsos.gov, as of August 2026
- South Dakota Secretary of State via sosenterprise.sd.gov, as of August 2026
- South Dakota yearly filing: Annual via sdlegislature.gov, as of October 2026
- South Dakota report due date via sdlegislature.gov, as of August 2026
- SDCL 47-34A-203 via sdlegislature.gov, as of August 2026
- South Dakota formation fee: Filing via sdsos.gov, as of October 2026
- South Dakota formation fee: Filing via sdlegislature.gov, as of October 2026
- South Dakota registered agent statute via sdlegislature.gov, as of October 2026
- pricing page from SD Registered Agent.org, prices as of November 13, 2026
- pricing page from South Dakota Registered Agent.co, prices as of November 13, 2026
- South Dakota service page from Mainstay Filing, prices as of November 13, 2026