Updated October 6, 2026 · 7 services tested
We tested 7 registered agent services for South Dakota. Northwest Registered Agent is our pick: $125 first year, then $125/yr.
By Jon Morgan · Fact-checked by Jon Tobin, Business Attorney · How we test
Northwest Registered Agent
$125 first year, then $125/yrFree first year with its $39 LLCGet Northwest's agent service (opens in a new tab)
ZenBusiness
$99 first year, then $199/yrHalf price in year one when you switch to ZenBusiness (state fee extra)See ZenBusiness agent plan (opens in a new tab)
Harbor Compliance
$99 first year, then $159/yrFor new customersSee Harbor Compliance agent plan (opens in a new tab)Prices checked October 6, 2026.
We compared registered-agent pricing, documented features, and account observations for South Dakota founders. Our tests covered different service steps by provider, including LLC formation and active-agent account access where available.
Northwest Registered Agent remains our top pick. ZenBusiness ranks second at 4.7/5 for its guided platform and stronger public customer-review score, while Harbor Compliance ranks third at 4.6/5 and remains a strong option for multi-state compliance.
Watch the renewal price instead of whatever a provider quotes at signup. South Dakota's own Annual Report fee stays apart from every number below, and the table lists providers in overall recommendation order and shows their recurring prices.
| Service | Agent price | RA bundled with formation | Service features | Score | Compare offers |
|---|---|---|---|---|---|
| $125 first year, then $125/yrFree first year with its $39 LLC | Yes (free first year with formation) | • Same-day scanning of legal mail • Files change-of-agent form for switchers • Home address kept off public filings | 4.9 | Get agent service (opens in a new tab) |
| $99 first year, then $199/yrHalf price in year one when you switch to ZenBusiness (state fee extra) | No (separate purchase, never pre-selected) | • Same-day scanning with an email alert • Address limited to legal and state mail • Never billed quietly without a signup step | 4.7 | See plan (opens in a new tab) |
| $99 first year, then $159/yrFor new customers | No (sold separately) | • Entity Manager tracks standing in every state • No per-document scanning charge • 3-year prepay locks the $99/year rate | 4.6 | See plan (opens in a new tab) |
 | $249 first year, then $249/yr | No | • Documents scanned with time-sensitive alerts • Unlimited cloud storage • Not offered during formation checkout | 4.4 | See plan (opens in a new tab) |
 | $149 first year, then $149/yrFree first year with a Bizee LLC | Yes (free first year with formation) | • Dedicated tab for registered-agent mail • Free-year policy stated upfront on-site • Renewal billed apart from other tools | 4.3 | See plan (opens in a new tab) |
 | $596 first year, then $596/yrBilled $149 a quarter | No | • Scans typically post within 2-3 hours • Standalone purchase, not tied to formation • Plain scope: receive and forward only | 4.2 | See plan (opens in a new tab) |
South Dakota Registered Agent Best Local Agent★ 3.9 / 5 | $49 first year, then $49/yrYear one included in its $299 South Dakota LLC package | No | • Portal built for South Dakota accounts only • State forms come pre-filled • Annual Report deadline reminders included | 3.9 | See plan (opens in a new tab) |
Prices checked October 6, 2026.
Each score combines support, price, features, privacy and security, compliance alerts and user ratings.
Refund: 90 days
Legal mail addressed to our test entity through Northwest Registered Agent gets scanned the same day it arrives, filed under a plain "Documents" tab instead of a general notifications feed.
The company's own address stands in for a customer's home address on every public filing, so nothing personal shows up in a state database search.
Northwest Registered Agent advertises that its own team handles the switch-over filing whenever a customer moves from another provider.
Its pitch rests on one specific claim. The per-year price hasn't budged in a long stretch, and no extra per-document charges show up later.
Pros
Cons
Refund: 60 days
ZenBusiness tells you upfront, right on the signup screen, that this is a separate purchase. It does not come with an LLC order by default.
Skip that box during signup and the account just stores an "Appoint ZenBusiness" button for later, with no surprise charge waiting. The mail policy is just as plain. This address takes court paperwork and state notices, nothing else.
Pros
Cons
Harbor Compliance's order wizard prices the registered agent fee on its own line before checkout. Its own team told us scanned legal notices post to the Client Portal the same day they arrive, with no delay before electronic delivery.
That same team pointed to a tool called Entity Manager, which tracks a customer's good standing across every state the business operates in, well beyond South Dakota.
It also keeps pre-filled state forms in the same dashboard, next to copies of past filings.
Pros
Cons
Refund: 60 days
Our formation order through LegalZoom never once surfaced this option during checkout. Anyone who wants it has to track it down and buy it separately afterward.
United States Corporation Agents, Inc. actually does the work behind the scenes. LegalZoom owns this company outright, so it's a real operating entity rather than just a name printed in fine print.
There's no separate renewal figure published anywhere. Whatever a customer pays that opening year simply repeats every year after, at the same rate.
Pros
Cons
Refund: Before state payment
Bizee drops this service's price to zero for the first year when it ships with an LLC order. That policy is printed plainly out in the open.
We noticed the account keeps a tab just for this job, apart from Bizee's other alerts. Anything routed there posted the moment a scan finished, with an instant email instead of a daily batch.
Pros
Cons
Open any card for the complete review, scores and packages.
Refund: 60 days
You don't need to buy formation first to get this from Swyft Filings. It sells the registered agent service as a standalone product, through the same dashboard that gave us live status updates during our formation test.
Swyft Filings advertises a personalized support representative assigned to each account, a narrower promise than the generic help-desk language some competitors lean on.
Its marketing also stays narrow about what the job itself covers. The service receives and forwards documents, nothing more, with no state filings included.
The billing structure is the real catch. Four separate quarterly charges add up to a noticeably higher yearly total than a provider that bills once.
Pros
Cons
South Dakota Registered Agent runs out of one Watertown office and works only with South Dakota entities. National names on this list juggle every state at once.
A scanned document lands in a portal built specifically for South Dakota accounts instead of a generic multi-state login.
The provider's own site says its state forms come pre-filled with its name and address, saving a step on a task most owners rarely handle.
Pros
Cons
Our testing methodology combines provider research with account observations where access was available.
The ZenBusiness test purchased LLC formation only, without activating its paid registered-agent service; the Harbor Compliance assessment covered direct Q&A and a pricing and signup-wizard walkthrough without a paid order.
We average six numeric categories equally to calculate each overall score, rounding the result to one decimal place. The separate South Dakota Fit subsection adds context and is not a seventh numeric score.
ZenBusiness's six scores average 4.700/5; Harbor Compliance's average 4.633/5, giving displayed overall scores of 4.7 and 4.6, respectively.
One plain question, sent before any money changed hands, exposed the widest gap between these seven companies faster than anything else we tried.
Northwest Registered Agent answered fastest of the group, and ZenBusiness came in a close second for how directly it answered what we actually asked.
Response time dropped off sharply at the bottom of the list, where a simple question sat unanswered for days.
Renewal price matters more than the signup discount when comparing recurring costs. Harbor Compliance renews at $159 per year, compared with ZenBusiness at $199 per year, so Harbor earns the higher Price score: 4.7 versus 4.6.
Their current introductory rates both start at $99. Compare the final checkout total and any formation or multi-year conditions before deciding how much the first year will cost.
Northwest Registered Agent has the highest Features score at 4.8, while ZenBusiness and Harbor Compliance each score 4.7. Northwest's forms library and handling of agent-change paperwork add practical value beyond receiving documents.
Harbor Compliance's Entity Manager stands out for tracking registrations in multiple states, while ZenBusiness provides guided account tools through Velo. Those different strengths may matter more to an individual owner than the small numerical gap.
Northwest Registered Agent and Harbor Compliance share the highest Privacy and Security score at 4.9, while ZenBusiness scores 4.7.
We considered documented address-use policies and secure document handling alongside the account observations available to us.
An agent's address can replace a personal address in the registered-agent field, but it does not remove information required elsewhere on state filings.
ZenBusiness explicitly limits its agent address to legal and state mail, rather than general business correspondence.
Northwest Registered Agent and Harbor Compliance each score 4.9 for Compliance Alerts, while ZenBusiness scores 4.6. We considered the clarity and availability of deadline reminders; managed filing services, when offered, may carry a separate charge.
Public customer reviews are one input in our comparison, alongside service features and account observations. ZenBusiness earns a 4.8 User Ratings score; Harbor Compliance earns 3.9.
These are editorial category scores derived from the review snapshot checked on October 2, 2026, rather than ratings of a state-specific office.
ZenBusiness's score combines Trustpilot's 4.8/5 from 32,767 reviews and BBB's 4.04/5 from 817 customer reviews, weighted by review count. The result is 4.78/5, rounded to 4.8.
Harbor Compliance's score uses Trustpilot's 3.1/5 from 53 reviews, BBB's 1.0/5 from 8 customer reviews, and Birdeye's 4.2/5 from 245 Google reviews. The same weighting gives 3.93/5, rounded to 3.9.
Review counts and invitation practices differ across platforms, so these samples are not directly comparable measures of service quality.
BBB customer-review averages are separate from its business letter grades; Harbor's own site also reports a separate Google sample of 4.3/5 from 212 reviews.
The real local wrinkle here isn't the registered agent rule, which tracks the Model Registered Agents Act closely, but the separate Annual Report every LLC owes the Secretary of State on its own independent schedule, detailed in Quick Facts above.
No registered agent's renewal price on this page touches that separate state report, so budget for it as its own yearly line item instead.
South Dakota also keeps a genuine commercial-versus-noncommercial agent distinction written into statute. In practice it shapes how the state records an agent more than what a customer is actually billed.
South Dakota Registered Agent's own Annual Report alert and Northwest Registered Agent's free change-of-agent filing both save a step tied specifically to this state's calendar.
Standalone annual rates among these providers start at $49 and reach about $249 per year, excluding quarterly billing, prepaid discounts and paid membership requirements.
ZenBusiness starts at $99 and renews at $199; Harbor Compliance starts at $99 and renews at $159.
Swyft Filings bills $149 or more per quarter, which totals at least $596 across twelve months.
That range has nothing to do with South Dakota's own Annual Report, a completely separate obligation every LLC owes the Secretary of State. That report costs $55 online or $70 by paper, due the first day of the anniversary month.
Acting as your own registered agent costs nothing at all, provided you can meet the state's address and availability requirement yourself.
Anyone comparing full LLC formation packages instead should check our South Dakota LLC services guide, built from the same hands-on testing.
South Dakota's rule centers on naming an agent with a real street address, and the state's Model Registered Agents Act lays out exactly who qualifies. Here's the full list of what applies.
Yes, every LLC and corporation must maintain one under South Dakota's Model Registered Agents Act, satisfied at a street address inside the state.
A registered agent accepts service of process and required statutory notices, then forwards them to the business at its address on file.
Yes, provided you hold a qualifying South Dakota street address and are available there during regular business hours.
Standalone annual rates on this list start at $49 and reach about $249, excluding prepaid discounts, with first-year promotions starting at $99.
Swyft Filings costs at least $596 first year, then $596/yr (billed $149 a quarter) when its quarterly bills are added together.
File a Statement of Change of Registered Office or Registered Agent with the Secretary of State and pay the $10 fee, online or by paper.
A commercial registered agent appears on the Secretary of State's own list, while a noncommercial agent, including an individual acting for their own business, does not need to be listed that way.
Yes. Every LLC owes an Annual Report to the Secretary of State, due the first day of the anniversary month, separate from any registered agent fee.
Every provider on this page handled South Dakota service of process correctly, and none put a customer's own address on the public filing. Renewal price and scan speed actually separated them.
Northwest Registered Agent takes the top spot here for consistency. No weak spot drags any single score down, unlike some competitors that shine in one area and lag everywhere else.
If price is the only factor that matters to you, South Dakota Registered Agent's flat $49 rate ($49 first year, then $49/yr) deserves a look. Weigh Harbor Compliance's cross-state tools too if you're registered in more than one state.
ZenBusiness is our second overall choice at 4.7/5, combining guided account tools with the stronger public customer-review score.
Harbor Compliance ranks third at 4.6/5 and is still the specialist pick for owners tracking compliance across multiple states.
References
Our verdict
$125 first year, then $125/yr. 90-day money-back guarantee.
Prices checked October 6, 2026.