3 Best Registered Agents in South Dakota (2026), No Fluff
South Dakota, 2026: SD Registered Agent.org ($99 a year), Mainstay Filing ($149 a year) and South Dakota Registered Agent.co ($99 a year) are our picks for registered agents, in that order. An agent runs $99 to $149 for year one and $297 to $447 for three years.
Straight from the LLC Straight Talk editorial team
Quick facts
The short of it
Do you have to?
Yes, you have to
Statute's word
Registered agent
What agents charge
$99 to $149 a year
Who we'd use
SD Registered Agent.org, Mainstay Filing then South Dakota Registered Agent.co
An in-state street address on record; three government letters a year scanned at no cost; Handles corporations, LPs, LLPs and nonprofits as well as LLCs
Service fees only, from each company's prices on November 13, 2026. State fees are the same whoever you pick.
The questions that matter
Do I have to name a registered agent?
Every LLC must name a registered agent with an in-state street address.
Statute: SDCL 59-11-6. sdlegislature.gov, confirmed October 2026, if you don't believe us
Who's allowed to 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.
A qualifying owner can serve for free.
What does an agent cost?
Agent prices on this page start at $99 to $149 a year, and three years of service come to $297 to $447.
Naming a different agent won't change any state fee.
What does an agent actually do?
It takes delivery of lawsuits and official state mail for the LLC at an address in South Dakota.
Ask how fast the agent tells you when something shows up, so you don't blow a deadline. What's service of process?
What else does the state bill every year?
The annual report is the one you can't forget. It's annual and runs $55. Per the state, it's due due during the entity's anniversary month.
On money out the door in three years (35% of the score), SD Registered Agent.org wins.
We run five tests: money out the door in three years (35%), jobs the price actually covers (30%), no hunting for the price (14%), no surprise at renewal (11%) and where it works (10%).
Mainstay Filing costs $150 more over three years than SD Registered Agent.org, which comes to $297.
Every line above links to the state's own page. The total's ours: the filing, two reports and any minimum tax.
More questions
Can I be my own agent?
Yes, if your address and status match the rule. Lots of owners still pay a service to keep their address private.
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?
Over three years you're looking at $297 at SD Registered Agent.org, $447 at Mainstay Filing, $297 at South Dakota Registered Agent.co
Where do these numbers come from?
Official South Dakota sources back the state side, and posted prices back the service side.
Do I have to use a service?
Not required. The state takes filings from owners.
What's the best registered agent in South Dakota?
SD Registered Agent.org is first: a company that never leaves South Dakota pays $297 over three years. Then comes Mainstay Filing and South Dakota Registered Agent.co.