3 Best Foreign Registration Services in South Dakota (2026): Prices Tracked
The best-value foreign registration services for South Dakota in 2026 are South Dakota Registered Agent.co ($199), Mainstay Filing ($199) and SD Registered Agent.org ($199), ranked in that order. $750 goes to the state however you file; the service side adds $397 to $497 over three years.
Tracked by the Filing Price Watch editorial team
Ordered by:
Ordered by five tracked measures, led by cost at 37% and filings covered at 29%
The short version
Fee paid to the state$750sdsos.gov (pulled October 2026, noted here)
Opening prices$199Excludes government fees
Three-year spend$397 to $497Renewals included
State total, three years$860Registration, reports, any minimum tax
Crossover yearNeverNo service overtakes another
The South Dakota picks, ranked
Service prices only. The $750 state fee applies to every service.
#Ordered byPrice in year 1Price at renewalThree-year spend
1
Top pick
1. South Dakota Registered Agent.co: best for a lone extra state
$199 plus the state's fee, then $99 a year
Price in year 1$199
Price after year 1$99/yr
Three-year spend$397
First on the watchlist is South Dakota Registered Agent.co. Three years of service fees come to $397.
It costs less over three years than Mainstay Filing, and three-year cost is 37% of the order.
Price covers
The South Dakota registration filing
A year of agent service to begin with
Holds up
No agent charge in year one
Service charge of $199
A small $99 renewal
Weak spots
A second provider is needed at home
2
Complete package
2. Mainstay Filing: best for one fee in any state
$199 plus the state's fee, then $149 a year
Price in year 1$199
Price after year 1$149/yr
Three-year spend$497
Mainstay Filing places second. $199 added to the state fee, a free first registered agent year, then $149 a year.
Its three-year total is $100 above South Dakota Registered Agent.co, and cost is 37% of the order.
Agent renewal in any state: $149 per year.
Price covers
Registration sent to the state office
Registered agent is free in year one
The same fee in every state
Holds up
Service charge of $199
Handy if another state follows
Registered agent is free in year one
Weak spots
South Dakota Registered Agent.co charges $50 less for the agent
3
Local pick
3. SD Registered Agent.org: best for a nearby provider
$199 plus the state's fee, then $99 a year
Price in year 1$199
Price after year 1$99/yr
Three-year spend$397
Spot 3 goes to SD Registered Agent.org: three years of service fees come to $397.
Price for price, it matches South Dakota Registered Agent.co.
For the state side of three years we add up the filing fee, the report charged in years two and three and a yearly minimum tax if the state has one. Publication requirements and other open-ended costs are noted in the text, not totaled.
Why this order for South Dakota
The 37% measure tracked three-year cost separated the top two.
For South Dakota Registered Agent.co, three years add up to $397, a saving of $100 against Mainstay Filing.
South Dakota foreign LLC registration fee and rules, as written by the state
The South Dakota Secretary of State collects $750 and the Application for Certificate of Authority, Foreign Limited Liability Company from out-of-state LLCs working in South Dakota. Enclose certificate of Existence.
From the source: sdlegislature.gov (pulled October 2026, noted here)
State fees and nothing else
Do it all yourself and you owe only the state: $860 over three years. The services above add $397 to $497 for the paperwork.
South Dakota pricing questions
How much does it cost to register a foreign LLC with South Dakota?
$750 in state fees, and these services add $199.
What do these services cost over three years?
$397 to $497 across these services, not counting state fees.
What form registers the LLC?
The registration is Application for Certificate of Authority, Foreign Limited Liability Company, filed with the South Dakota Secretary of State.
Does South Dakota ask for a certificate from the home state?
Yes, namely certificate of Existence.
What recurring filing comes after registration?
It is the annual report, at $55.
In what year does one service become pricier than another?
There is no crossover inside ten years.
Which foreign registration service is the best value for South Dakota?
On our five measures the South Dakota order is South Dakota Registered Agent.co, Mainstay Filing and SD Registered Agent.org, with South Dakota Registered Agent.co ahead on tracked three-year cost.