Rank1
Top pick on this page
1. Mainstay Filing: best for all fifty states
$149 yearly, unchanged
Editor score9.3out of 10
Mainstay Filing takes the top spot because a single plan at $149 a year that travels with the company to any state and renews at $149.
Starting from scratch? The formation package is $199 a year and adds the South Dakota filing and the annual report.
Its three-year total is $150 above SD Registered Agent.org's, and what the price covers justifies that gap for us.
In the price
- A registered office street address in whichever state you need
- Service of process scanned and uploaded within the same business day, free
- Three government letters a year scanned free
- Compliance reminders
Good
- Takes LLCs, corporations, LPs, LLPs and nonprofits
- Papers served on the company are scanned the same business day at no charge
- Free scans of three government letters each year
- $149 a year, and it holds at renewal
Watch for
- The agent alone is $50 a year more than SD Registered Agent.org
- Annual report filing sits with the formation package, not the agent plan
Rank2
Best value here
2. SD Registered Agent.org: best for the smallest yearly fee on this list
$99 yearly, unchanged
Editor score8.9out of 10
SD Registered Agent.org makes the list at number two because it is built for South Dakota companies, at $99 a year with an in-state street address as the registered office.
SD Registered Agent.org provides the state street address on the public record and sends you scans of any legal papers served there.
In the price
- The physical in-state address the state asks for
- Papers served on the company are scanned into your online account
Good
- Costs $99 a year, renewal included at the same price
- Yearly cost below Mainstay Filing
- Also files LLC formations, agent year one included
Watch for
- You handle the annual report yourself
- Made for South Dakota; another state needs a different agent
Rank3
South Dakota specialist
3. South Dakota Registered Agent.co: best for South Dakota specialists
$99 yearly, unchanged
Editor score8.6out of 10
South Dakota Registered Agent.co makes the list at number three because it is built for South Dakota companies, at $99 a year with an in-state street address as the registered office.
South Dakota Registered Agent.co stands in as the company's registered office, so there is a real in-state street address, and each legal paper served is scanned and sent to you.
We found no difference in price or features between SD Registered Agent.org and South Dakota Registered Agent.co; choose whichever you prefer.
In the price
- A state street address on file as the registered office
- You read served legal papers online as scans
Good
- Forms LLCs as well, with year one of agent service free
- Mainstay Filing charges more per year
- $99 yearly with no change at renewal
Watch for
- You handle the annual report yourself
- Made for South Dakota; another state needs a different agent
The 3 picks side by side
Each number out of 10 is our own mark, drawn from the weighted criteria on How we rank, and not a customer rating.
South Dakota registered agent pricing in 2026: first year, renewals, three-year total
Every price comes from the company's own pages as of November 12, 2026. South Dakota's own fees stay the same whichever agent you pick.
Why Mainstay Filing is first
Filing Shortlist puts 28% of the weight on three-year price and 28% on what the price covers. The remaining 44% goes to renewal terms, fit for the state and price clarity, and for South Dakota the deciding factor was what the price covers.
Mainstay's plan covers a wider area: it scans papers served on the company the same business day at no charge, the price stays the same in all fifty states, and three government letters a year are scanned free. SD Registered Agent.org is cheaper, and the two end up close.
Every criterion and weight is set out on How we rank.
South Dakota registered agent rules from South Dakota Secretary of State
Every LLC must name a registered agent with an in-state street 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. Statute: SDCL 59-11-6.
The South Dakota annual report: price and deadline
Every company formed here files the annual report every year. The state charges $55 and wants it due during the entity's anniversary month. Being late adds $50. The reminders about it go to your registered agent.
Common questions about South Dakota registered agents
Does the company need to name a registered agent in South Dakota?
It does. South Dakota wants each LLC to name a registered agent with a street address inside the state, and that name stays on the public record.
How much do agents in South Dakota charge per year?
Yearly prices span $99 to $149, and each company holds its price at renewal.
Can the owner be the registered agent?
Yes, if you meet the state's conditions. 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.
By what date is the South Dakota annual report due?
The deadline is due during the entity's anniversary month, and the state charges $55. A late filing adds $50.
Which registered agents made this shortlist?
Mainstay Filing ($149 a year), SD Registered Agent.org ($99 a year) and South Dakota Registered Agent.co ($99 a year), listed from the top pick down.
Which South Dakota registered agent makes the shortlist first?
Mainstay Filing, because the price is $149 a year whether you stay in one state or add more, with three government letters a year scanned at no charge.
Where the figures come from
- South Dakota Secretary of State, Business Services / Corporations Division (checked again August 2026)
- South Dakota Secretary of State, Business Services / Corporations Division (checked again August 2026)
- South Dakota yearly filing: Annual report: fee and how, official source (checked again October 2026)
- South Dakota report due date (checked again August 2026)
- SDCL 47-34A-203 (checked again August 2026)
- South Dakota formation fee: Filing fee, official source (checked again October 2026)
- South Dakota formation fee: Filing fee, official source (checked again October 2026)
- South Dakota registered agent statute (checked again October 2026)
- Pulled from Mainstay Filing: South Dakota service page, November 12, 2026
- Pulled from SD Registered Agent.org: pricing and service pages, November 12, 2026
- Pulled from South Dakota Registered Agent.co: pricing and service pages, November 12, 2026