Place1
Our top pickMainstay Filing
1. Mainstay Filing: best for companies that may expand
$149 a year, same at renewal
Our mark9.6out of 10
Mainstay Filing is number one here: one $149 agent price here and in every other state, renewing at $149.
The $199 formation package includes the agent and files the annual report as well.
It costs $150 more than South Dakota Registered Agent.co across three years, which the wider coverage justifies on our method.
What you get
- A physical in-state address on the public record
- Service of process scanned the same business day, no fee
- First three government mailings a year scanned free
- Compliance reminders
Why pick it
- $149 yearly, no renewal increase
- Service of process scanned the same business day, no fee
- Works for LLCs, corporations, LPs, LLPs and nonprofits
- First three government mailings a year scanned free
Less good
- Agent alone costs $50 a year more than South Dakota Registered Agent.co
- The agent-only plan does not file your annual report
Place2
Best local optionSouth Dakota Registered Agent.co
2. South Dakota Registered Agent.co: best for a low flat yearly price
$99 a year, same at renewal
Our mark9.2out of 10
South Dakota Registered Agent.co ranks second: $99 a year with the same price at renewal, the lowest yearly price on this list.
The plan covers an in-state street address for your registered office, with legal documents scanned and sent to you online.
What you get
- Street address on the public record
- Legal papers scanned and posted online for you
Why pick it
- Costs less than Mainstay Filing each year
- $99/yr with no renewal increase
- Can form your LLC as well
Less good
- Annual report is on you
- Focused on South Dakota; other states need their own agent
Place3
Local South Dakota agentSD Registered Agent.org
3. SD Registered Agent.org: best for a local South Dakota agent
$99 a year, same at renewal
Our mark9.0out of 10
SD Registered Agent.org ranks third: $99 a year with the same price at renewal, the lowest yearly price on this list.
The plan covers an in-state street address for your registered office, with legal documents scanned and sent to you online.
Same prices and features as South Dakota Registered Agent.co; pick whichever you prefer.
What you get
- Street address on the public record
- Legal papers scanned and posted online for you
Why pick it
- $99/yr with no renewal increase
- Costs less than Mainstay Filing each year
- Can form your LLC as well
Less good
- Annual report is on you
- Focused on South Dakota; other states need their own agent
Our top 3 at a glance
| Rank | Service | Our score | Annual price | Renewal price | Best for | Link |
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| 1 | Mainstay Filing | 9.6 | $149 | $149/yr | Agent plus fifty-state coverage | Visit Mainstay FilingPartner link. We may earn money if you buy. |
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| 2 | South Dakota Registered Agent.co | 9.2 | $99 | $99/yr | Lowest yearly price on this list | Visit South Dakota Registered Agent.coPartner link. We may earn money if you buy. |
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| 3 | SD Registered Agent.org | 9.0 | $99 | $99/yr | Lowest yearly price on this list | Visit SD Registered Agent.orgPartner link. We may earn money if you buy. |
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Editorial scores out of 10 from The Founders Review, using the criteria explained on How we rank. No customer ratings are involved.
South Dakota registered agent pricing (2026): annual price, renewal price and three-year total
| Service | Year one | Year two | Year three | Three-year total | Same price at renewal |
|---|
| Mainstay Filing | $149 | $149 | $149 | $447 | Yes |
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| South Dakota Registered Agent.co | $99 | $99 | $99 | $297 | Yes |
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| SD Registered Agent.org | $99 | $99 | $99 | $297 | Yes |
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Service fees as published on each company's own pages, read November 12, 2026. State fees are identical across these agents.
How we picked the order
Our method scores three-year cost (30%) and what one price covers (30%) most heavily, then renewal terms, fit for the state and price clarity. Here the order came down to what one price covers.
South Dakota Registered Agent.co is the lower price, but Mainstay's fifty-state coverage scored higher on our method.
Read the full criteria on our How we rank page.
South Dakota registered agent rules, per 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. Source: SDCL 59-11-6.
South Dakota's annual report and your agent
Every South Dakota LLC owes the annual report every year ($55), due due during the entity's anniversary month. It costs $50 more if late. State notices about it reach your registered agent.
What South Dakota founders ask
Does a South Dakota LLC need a registered agent?
Yes. Every LLC must name a registered agent with an in-state street address.
How much does a registered agent cost in South Dakota?
From $99 to $149 a year, the same at renewal.
Can I be my own registered agent?
Only when you meet the 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.
When is the South Dakota annual report due?
It is due due during the entity's anniversary month and the state fee is $55. Late filings cost $50 more.
Which registered agents do you rank here?
Mainstay Filing ($149 a year), South Dakota Registered Agent.co ($99 a year) and SD Registered Agent.org ($99 a year), in the order shown.
Which South Dakota registered agent is the best value?
On our method, Mainstay Filing: $149 a year for an agent that can follow the company into any state at the same price.