Best Registered Agent by State › South Dakota

Registered agent in South Dakota: requirements, real cost and our pick

Our pick for South Dakota is Mainstay Filing: $149 a year, the same at renewal. Every LLC must name a registered agent with an in-state street address.

What South Dakota requires

Agent neededRequired (SDCL 59-11-6)

Who can serveA 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.

AddressThe 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.

Change of agent$10, filed with South Dakota Secretary of State

Do it yourself?An owner or officer can usually serve as the agent, if they are available at the in-state address during business hours.

Checked October 20, 2026.

Our pick and the field

Registered agent prices for South Dakota read October 2026, from each provider’s own page.
Provider	Year 1	Renewal	What the page lists
Mainstay Filing	$149	$149	Registered agent all year; service of process scanned and uploaded the same business day
IncParadise	$89	$89	Its state page also lists a $40/yr pre-pay special.
ZenBusiness	$99	$199	Document receipt, scanning and upload to a dashboard; email notifications
Northwest Registered Agent	$125	$125	Its address on public filings; scans of state and legal mail; up to 5 pieces of other business mail scanned free a year; domain, website, email and phone line
Bizee	$149	$149	Compliance notifications; its address on the public record
LegalZoom	$249	$249	Alerts when mail arrives; documents scanned and uploaded; annual report reminders

What an agent does and doesn’t do here

It takes service of process and official state mail. It is not a business mailing address, and cannot stand in for one, for example for bank verification. See the full list.

Why prices differ so much in South Dakota

Published year-one prices here run $89 to $249, a $160 spread. IncParadise is lowest in year one. Three things drive the spread: a first-year price that renews higher, a free year that needs a formation order, and what is bundled, from scanning to annual-report reminders. Compare the renewal column, not the first one.

What is the best registered agent in South Dakota?

Mainstay Filing: $149 a year, the same at renewal. 5 other providers have a published South Dakota price, from $89 to $249 in year one.

Can I be my own registered agent in South Dakota?

An owner or officer can usually serve as the agent, if they are available at the in-state address during business hours. 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.

How do I change my registered agent in South Dakota?

File the state’s change form with South Dakota Secretary of State; the fee is $10 (SDCL 59-11-6).