What it means · South Dakota
3 Best Foreign Registration Services in South Dakota (2026), Compared
Quick explanation
- State charge to register
- $750
- Certificate from your home state?
- Required
- Ongoing requirement
- $55, annual report
- Our picks in order
- SD Registered Agent.org, Mainstay Filing then South Dakota Registered Agent.co
South Dakota: the ranked picks
Best first. See how we pick for the reasoning.1. SD Registered Agent.org: best for a budget registration
$199 up front, $99 annually after that
SD Registered Agent.org comes out on top: three years of service fees come to $397.
On three-year cost it comes in under Mainstay Filing, and cost counts for the most in our ranking.
Includes
- Application prepared and submitted
- Agent included for the first year
Points in its favor
- A modest renewal of $99
- Year-one agent service is included
- $199 on top of the state fee
Where it falls short
- A separate agent is needed in the home state
2. Mainstay Filing: best for growing companies
$199 up front, $149 annually after that
Number 2 on the list is Mainstay Filing, where the registration is $199 and there is no charge for the registered agent until year two.
Across three years it is $100 pricier than SD Registered Agent.org.
After the free year, the registered agent renews at $149 a year in any state.
Includes
- Application prepared and filed
- Registered agent, no charge in the first year
- Nationwide, one fee
Points in its favor
- No agent fee in the first year
- The price does not change by state
- Service fee of $199
Where it falls short
- Agent renewal of $149 lands $50 over SD Registered Agent.org
3. South Dakota Registered Agent.co: best for adding one more state
$199 up front, $99 annually after that
South Dakota Registered Agent.co takes the third slot: three years of service fees come to $397.
With the same prices as SD Registered Agent.org, this is a near tie.
Includes
- Application prepared and submitted
- Agent included for the first year
Points in its favor
- $199 on top of the state fee
- A modest renewal of $99
- Year-one agent service is included
Where it falls short
- A separate agent is needed in the home state
Compare prices
| # | Pick | Year one | Each year after | Total, 3 years | What you get | |
|---|---|---|---|---|---|---|
| 1 | SD Registered Agent.org | $199 | $99/yr | $397 | application prepared and submitted; agent included for the first year | Learn more at SD Registered Agent.orgPartner link. We may earn money if you buy. |
| 2 | Mainstay Filing | $199 | $149/yr | $497 | application prepared and filed; registered agent, no charge in the first year; Nationwide, one fee | Learn more at Mainstay FilingPartner link. We may earn money if you buy. |
| 3 | South Dakota Registered Agent.co | $199 | $99/yr | $397 | application prepared and submitted; agent included for the first year | Learn more at South Dakota Registered Agent.coPartner link. We may earn money if you buy. |
The questions, one by one
When must an out-of-state LLC register here?
An LLC from elsewhere that plans to do business in South Dakota must register first.
sdlegislature.gov, confirmed October 2026
What will registering set me back?
$750 in state fees, plus $199 for a service.
State fees over three years, registration included: $860. sdsos.gov, confirmed October 2026
What do I file, and where does it go?
You file the Application for Certificate of Authority, Foreign Limited Liability Company with the South Dakota Secretary of State, and that is all.
Include with it certificate of Existence.
What is due once the LLC is registered?
You keep filing the annual report, at $55.
Filings come due 1st of the anniversary month.
What put number one on top?
The deciding factor is what three years cost (34% of the weight), where SD Registered Agent.org is strongest.
What three years cost carries 34% and how much work the price handles carries 28%. Three smaller criteria decide close calls.
Over three years SD Registered Agent.org totals $397, which is $100 below Mainstay Filing.
What South Dakota requires
| Requirement | Fee or rule | Official source |
|---|---|---|
| Cost to register | $750 | sdsos.gov, confirmed October 2026 |
| Proof of good standing | Required | sdlegislature.gov, confirmed October 2026 |
| Annual report | $55 | sdlegislature.gov, confirmed October 2026 |
| Paid to the state in three years | $860 | Our total of the rows above |
FAQ
What about the state where I formed the LLC?
Generally yes. A nationwide provider can serve both states, while a local one cannot.
What is the three-year price of each?
$397 with SD Registered Agent.org, $497 with Mainstay Filing, $397 with South Dakota Registered Agent.co, and state fees come extra.
What are your sources?
The state side uses South Dakota's own publications. The service side uses published company prices.
Does the law require a service?
Not required. Services charge to do the paperwork for you.
Who does the filing?
Any of them can file it for you, with the state fee unchanged.
What is the best foreign registration service for South Dakota?
SD Registered Agent.org, because you pay $199 above the state fee, and $99 every year after. Then Mainstay Filing and South Dakota Registered Agent.co.
Where the facts come from
- sdsos.gov: South Dakota Secretary of State (confirmed August 2026)
- sosenterprise.sd.gov: South Dakota Secretary of State (confirmed August 2026)
- sdlegislature.gov: South Dakota yearly filing: Annual (confirmed October 2026)
- sdlegislature.gov: South Dakota report due date (confirmed August 2026)
- sdlegislature.gov: SDCL 47-34A-203 (confirmed August 2026)
- sdsos.gov: South Dakota formation fee: Filing (confirmed October 2026)
- sdlegislature.gov: South Dakota formation fee: Filing (confirmed October 2026)
- sdlegislature.gov: South Dakota registered agent statute (confirmed October 2026)
- sdsos.gov: South Dakota Secretary of State (confirmed October 2026)
- sdsos.gov: Foreign LLC application for Certificate (confirmed October 2026)
- sdlegislature.gov: SDCL 47-34A-1003, transacting business (confirmed October 2026)
- sdlegislature.gov: SDCL 47-34A-1008, effect of not (confirmed October 2026)
- sdlegislature.gov: SDCL 47-34A-1001 to 47-34A-1009, foreign (confirmed November 2026)
- SD Registered Agent.org pricing page, read November 13, 2026
- Mainstay Filing South Dakota service page, read November 13, 2026
- South Dakota Registered Agent.co pricing page, read November 13, 2026