How to Register a Foreign LLC in South Dakota (2026): 5 Steps and the 3 Best Services
Lesson answer for South Dakota in 2026: if you want help with registering a foreign LLC, use Mainstay Filing ($199), South Dakota Registered Agent.co ($199) and SD Registered Agent.org ($199), in that order. The lesson follows in 5 steps; the state's filing fee is $750, and each report after that is $55.
Prices from each company's own site, read November 12, 2026. Add South Dakota's $750 registration fee to each row.
Registering in South Dakota, step by step
Step1
Step 1: Confirm you need to register
A foreign LLC is one formed in another state. Before it transacts business in South Dakota, it registers there. If it does business unregistered: The company's contracts remain enforceable (SDCL 47-34A-1008(b)).
Step 3: Appoint a registered agent in South Dakota
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.
Step 4: Complete the Application for Certificate of Authority, Foreign Limited Liability Company
Pay $750 and file the Application for Certificate of Authority, Foreign Limited Liability Company with the South Dakota Secretary of State.
Official source: Per sdsos.gov, last confirmed October 2026
Step5
Step 5: Plan for the yearly filing
The recurring filing is the annual report, $55, 1st of the anniversary month.
Step-by-step costs
Step
Paid to
Amount
Filing to register
The state
$750
Annual report
The state
$55
Service fees (optional)
Service
$199 first year
State total over three years
The state
$860
Official state fees, cited under References. Three-year state total = filing + reports in years two and three + any minimum tax.
Behind the ranking
What decided it: lesson steps handled, 35% of our rubric.
A foreign LLC already lives in another state, so one provider for both states graded best.
Quick answers
What does it cost to register a foreign LLC in South Dakota?
$750 to the state. Services on this page charge $199 more.
Which form do I file to register?
The South Dakota Secretary of State takes the Application for Certificate of Authority, Foreign Limited Liability Company.
Do I need a certificate from my home state?
Yes: certificate of Existence.
What if the LLC does business there without registering?
The company's contracts remain enforceable (SDCL 47-34A-1008(b)).
What is due after registering?
Your next filing is the annual report at $55.
Which service should handle the registration?
We'd go with Mainstay Filing, because $199 over the state fee in any state, first year of agent service included. Then South Dakota Registered Agent.co and SD Registered Agent.org.