3 Best Registered Agents in South Dakota (2026): Prices Tracked
South Dakota watchlist, 2026: SD Registered Agent.org ($99/yr), Mainstay Filing ($149/yr) and South Dakota Registered Agent.co ($99/yr) lead the registered agents, best value first. Pay $99 to $149 to start, and $297 to $447 once three years are in.
Tracked by the Filing Price Watch editorial team
Ordered by:
Best value first, using our five measures
Prices on the watchlist
Must you have a registered agent?Yessdlegislature.gov (pulled October 2026, noted here)
Opening prices$99 to $149Charged each year
Three-year spread$297 to $447Three years of provider charges
Annual report$55 a yearsdlegislature.gov (pulled October 2026, noted here)
Switch pointLines stay apartOrder holds through year 10
Ranked picks
Prices come from each company's own pricing. Naming a different agent does not change what the state collects.
#Ordered byPrice in year 1Price at renewalThree-year spend
1
Top pick
1. SD Registered Agent.org: best for a single state to cover
$99 in year one and $99 after that
Price in year 1$99
Price at renewal$99/yr
Three-year spend$297
In South Dakota, SD Registered Agent.org is the best value because just one state, $99 a year, $99 once it renews.
On the heaviest measure, three-year cost, it beats Mainstay Filing.
Price covers
A physical in-state office
Served papers show up in your login
Holds up
A lower yearly price than Mainstay Filing
$99 annually with no increase
Weak spots
One-state service
The annual report is left out
2
Fifty states
2. Mainstay Filing: best for the same price in every state
$149 in year one and $149 after that
Price in year 1$149
Price at renewal$149/yr
Three-year spend$447
Spot 2 goes to Mainstay Filing: a flat $149 each year, no matter which state applies.
By year three it trails SD Registered Agent.org by $150.
Price covers
The registered office address
Up to three government mailings a year scanned for you at no charge
Covers LLCs, corporations, LPs, LLPs and nonprofits
Holds up
Works in every state
$149 every year
Weak spots
A yearly difference of $50
Does not file the yearly report
3
Local pick
3. South Dakota Registered Agent.co: best for a local backup
$99 in year one and $99 after that
Price in year 1$99
Price at renewal$99/yr
Three-year spend$297
Next up, South Dakota Registered Agent.co: just one state, $99 a year, $99 once it renews.
The state's share is worked out from three pieces: what it charges to file, what it charges for the next two reports, and any minimum tax. Anything without a fixed price, newspaper notices for instance, is left out of that figure.
Why this order for South Dakota
In South Dakota, tracked three-year cost (37% of the order) was the measure where SD Registered Agent.org pulled ahead.
Three years with SD Registered Agent.org come to $297, while Mainstay Filing runs $150 higher over the same stretch.
South Dakota registered agent requirements, as written by the state (South Dakota Secretary of State)
Every LLC must name a registered agent with an in-state street address.
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. Rule in force: SDCL 59-11-6.
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.
From the source: sdlegislature.gov (pulled October 2026, noted here)
The do-it-yourself total
Without a service the agent line is zero, provided you qualify, and the state charges the same. Services run $99 to $149 a year.
Short answers
How much does a South Dakota registered agent cost per year?
These agents charge $99 to $149 each year.
What do three years of agent service cost?
By year three these services have cost $297 to $447.
Is a registered agent required for a South Dakota LLC?
Yes, it does. Every LLC must name a registered agent with an in-state street address.
Can the owner serve as the registered agent?
Yes, when you qualify under the rules listed here.
What does the state charge the LLC each year?
Once the LLC exists, South Dakota expects the annual report each year, at $55, due during the entity's anniversary month.
In what year does one service become pricier than another?
They do not cross within ten years, so no service overtakes another.
Which registered agent is the best value in South Dakota?
SD Registered Agent.org is first, with Mainstay Filing and South Dakota Registered Agent.co after it.