Plain and short · South Dakota
3 Best Registered Agents in South Dakota (2026), Kept Simple
The short version
- Must an LLC name one?
- Yes, it is required
- Statute's word
- Registered agent
- Typical price
- $99 to $149 a year
- Our pick
- Mainstay Filing, South Dakota Registered Agent.co then SD Registered Agent.org
Ranked in South Dakota
The order follows five checks. Three-year cost comes first, then what the price covers. See method.1. Mainstay Filing: best for a company that may grow
Year one $149. Later years $149
Mainstay Filing comes first because $149 annually buys the same agent service in all fifty states.
Choose South Dakota Registered Agent.co and save $150 across three years, if the LLC never leaves South Dakota.
Includes
- A street address in the state
- Three government mailings a year scanned free
- For LLCs, corporations, LPs, LLPs and nonprofits
Good
- $149 a year, flat at renewal
- Goes with the LLC to a new state
Against
- Costs $50 more a year than the local pick
- Agent only. No report filing
2. South Dakota Registered Agent.co: best for an LLC that stays put
Year one $99. Later years $99
South Dakota Registered Agent.co takes second place because the local price is $99 a year, $99 at renewal, for one state.
Includes
- In-state address
- Legal papers scanned online
Good
- A lower yearly bill than the national pick
- Just $99 a year
Against
- Nothing outside the state
- Excludes the annual report from the price
3. SD Registered Agent.org: best for another local option
Year one $99. Later years $99
SD Registered Agent.org takes third place because the local price is $99 a year, $99 at renewal, for one state.
It charges what South Dakota Registered Agent.co charges.
Includes
- In-state address
- Legal papers scanned online
Good
- A lower yearly bill than the national pick
- Just $99 a year
Against
- Nothing outside the state
- Excludes the annual report from the price
Side by side
| # | Company | Year one | Renewal | Three years | Includes | |
|---|---|---|---|---|---|---|
| 1 | Mainstay Filing | $149 | $149/yr | $447 | A street address in the state; three government mailings a year scanned free; For LLCs, corporations, LPs, LLPs and nonprofits | View Mainstay FilingPartner link. We may earn money if you buy. |
| 2 | South Dakota Registered Agent.co | $99 | $99/yr | $297 | In-state address; legal papers scanned online | View South Dakota Registered Agent.coPartner link. We may earn money if you buy. |
| 3 | SD Registered Agent.org | $99 | $99/yr | $297 | In-state address; legal papers scanned online | View SD Registered Agent.orgPartner link. We may earn money if you buy. |
The facts
Is a registered agent required?
Every LLC must name a registered agent with an in-state street address.
Law: SDCL 59-11-6. from sdlegislature.gov, October 2026, kept short
Who may be the 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 qualify, you can be your own agent at no cost.
What does an agent cost?
Our picks charge $99 to $149 a year. Three years cost $297 to $447.
No state fee depends on the agent.
What does an agent do?
It is the LLC's contact in South Dakota for court papers and state letters.
If papers arrive and nobody accepts them, a case can proceed without the LLC. Service of process, defined
What else is due each year?
Pay $55 each year for the annual report. The state puts the date at due during the entity's anniversary month.
from sdlegislature.gov, October 2026, kept short
Why this order?
Mainstay Filing scores best on work included, which is 27% of the score.
Two checks carry most of the weight: three-year cost (38%) and work included (27%).
Add a state later and the agent and price come along. South Dakota Registered Agent.co stops at the South Dakota border.
South Dakota agent rules, sourced
| Requirement | Rule or amount | Source |
|---|---|---|
| Fee to form | $150 | from sdlegislature.gov, October 2026, kept short |
| Registered agent | Yes, it is required | from sdlegislature.gov, October 2026, kept short |
| Annual report | $55 every year | from sdlegislature.gov, October 2026, kept short |
| State fees, three years | $260 | Sum of the rows above |
Questions
May I name myself?
Yes, when your address and status fit the rule. Many owners still hire a service for privacy.
What address does an 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.
What do the picks cost over three years?
Mainstay Filing is $447, while South Dakota Registered Agent.co is $297, while SD Registered Agent.org is $297
Where do the figures come from?
Official South Dakota sources for the state side. Published prices for the service side.
Must I use a service?
No law requires a service. It is a paid convenience.
What is the best registered agent in South Dakota?
Mainstay Filing, because there is one rate, $149 a year, wherever the LLC registers. Then South Dakota Registered Agent.co and SD Registered Agent.org.
Sources
- Charter Simple keeps South Dakota Secretary of State on file from sdsos.gov, confirmed August 2026, and nothing more
- Charter Simple keeps South Dakota Secretary of State on file from sosenterprise.sd.gov, confirmed August 2026, and nothing more
- Charter Simple keeps South Dakota yearly filing: Annual on file from sdlegislature.gov, confirmed October 2026, and nothing more
- Charter Simple keeps South Dakota report due date on file from sdlegislature.gov, confirmed August 2026, and nothing more
- Charter Simple keeps SDCL 47-34A-203 on file from sdlegislature.gov, confirmed August 2026, and nothing more
- Charter Simple keeps South Dakota formation fee: Filing on file from sdsos.gov, confirmed October 2026, and nothing more
- Charter Simple keeps South Dakota formation fee: Filing on file from sdlegislature.gov, confirmed October 2026, and nothing more
- Charter Simple keeps South Dakota registered agent statute on file from sdlegislature.gov, confirmed October 2026, and nothing more
- The Mainstay Filing South Dakota service page, on November 13, 2026
- The South Dakota Registered Agent.co pricing page, on November 13, 2026
- The SD Registered Agent.org pricing page, on November 13, 2026