Mainstay Filing takes the top spot because $199 prepares the South Dakota registration and the registered agent role costs nothing in year one, then $149 a year.
Year one as agent costs nothing; every year after it is $149, wherever the company registers.
Its three-year total is $100 above South Dakota Registered Agent.co's, and what the price covers justifies that gap for us.
In the price
- The registration filing prepared and submitted
- Your registered agent for year one at no charge
- Papers served on the company scanned free on the day they arrive
Good
- The same price in each of the fifty states
- Papers served on the company are scanned the same business day at no charge
- No charge for registered agent service in year one
- $199 service fee, with the state's fee added
Watch for
- The agent is $149 a year after year one, $50 above South Dakota Registered Agent.co
South Dakota Registered Agent.co makes the list at number two because the South Dakota registration is $199 and includes year one as agent, with $99 a year after that.
The registered office is an in-state street address supplied by the plan, and any papers served on the company show up as scans in your online account.
In the price
- Registration prepared and filed
- One year of registered agent service to start
Good
- Year one as your registered agent is covered
- $99 yearly for the agent after year one
- Registers the company for $199 and the state fee
Watch for
- South Dakota only; your home state needs its own agent
- The EIN application is an extra charge ($99)
SD Registered Agent.org makes the list at number three because the South Dakota registration is $199 and includes year one as agent, with $99 a year after that.
The registered office is an in-state street address supplied by the plan, and any papers served on the company show up as scans in your online account.
The published prices and features of South Dakota Registered Agent.co and SD Registered Agent.org are identical, so the order between them is a coin flip between solid options.
In the price
- Registration prepared and filed
- One year of registered agent service to start
Good
- Keeps the agent for $99 a year from year two
- A year as your registered agent comes included
- A $199 price on top of the registration fee
Watch for
- South Dakota only; your home state needs its own agent
- The EIN application is an extra charge ($99)
The 3 picks side by side
Filing Shortlist sets each score out of 10 itself, using the criteria on How we rank; no customer ratings feed in.
South Dakota foreign registration service pricing in 2026: first year, renewals, three-year total
Every price comes from the company's own pages as of November 12, 2026. The $750 South Dakota registration fee comes on top of each row and is left out of the totals.
What decided the order
On Filing Shortlist's shortlist, three-year price and what the price covers carry 28% each and renewal terms, fit for the state and price clarity share the other 44%. In South Dakota, what the price covers made the difference.
Registering in a second state touches two states, and one provider with one price in both scored highest on coverage, ahead of South Dakota Registered Agent.co.
Every criterion and weight is set out on How we rank.
Registering a foreign LLC in South Dakota: fee, form and office
Registration goes to the South Dakota Secretary of State on the Application for Certificate of Authority, Foreign Limited Liability Company. The state fee is $750. Along with the form, South Dakota expects certificate of Existence.
Each year after that, the company files the annual report for $55, due 1st of the anniversary month.
What to have ready before you file
- Certificate of Existence.
- The company's exact legal name and its formation date in the home state.
- A registered agent at a street address in the state. Every company on this shortlist can be that agent.
- Payment of the $750 state fee with the filing.
- A reminder in your own calendar for the annual report and its $55 fee.
The cost of skipping South Dakota registration
Its contracts remain valid (SDCL 47-34A-1008(b)).
Common questions about South Dakota foreign registration services
Must an LLC from another state register in South Dakota?
It must, once it does business in the state.
What is the full price of a foreign LLC registration in South Dakota?
The state fee is $750, and service fees run $199.
Does South Dakota ask for proof of good standing from home?
It does. The state wants certificate of Existence.
Does a registered foreign LLC still need a registered agent?
Yes. The company keeps a registered agent in the state, at a street address there, for as long as it stays registered.
Which foreign registration services made this shortlist?
Mainstay Filing ($199), South Dakota Registered Agent.co ($199) and SD Registered Agent.org ($199), listed from the top pick down.
Which service leads the South Dakota foreign registration shortlist?
Mainstay Filing, because the fee is $199 plus the state's own, with a free first year as registered agent, and the price is identical in every state.
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)
- South Dakota Secretary of State, business services (checked again October 2026)
- Foreign LLC application for Certificate of Authority (checked again October 2026)
- SDCL 47-34A-1003, transacting business (checked again October 2026)
- SDCL 47-34A-1008, effect of not registering (checked again October 2026)
- SDCL 47-34A-1001 to 47-34A-1009, foreign limited liability companies (checked again November 2026)
- Pulled from Mainstay Filing: South Dakota service page, November 12, 2026
- Pulled from South Dakota Registered Agent.co: pricing and service pages, November 12, 2026
- Pulled from SD Registered Agent.org: pricing and service pages, November 12, 2026