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LLC UnpackedEvery filing, unpacked: the fee, the form, the catch.

Unpacked · Wisconsin

3 Best Foreign Registration Services in Wisconsin (2026), Opened Up

Opened up for 2026, the foreign registration services in Wisconsin rank Mainstay Filing ($199), WI Registered Agent.org ($199) and Wisconsin Registered Agent.co ($199), best on top. Every option pays the state $100, then services total $397 to $497 across three years.
Unpacked by the LLC Unpacked editorial team

Top layer

Registration fee
$100
Certificate packed in?
Not needed
Afterward
$65, annual report
Top of the stack
Mainstay Filing, WI Registered Agent.org then Wisconsin Registered Agent.co

Wisconsin: ranked

Prices come from each company's own page. See how we open it up.
Ranked first

1. Mainstay Filing: best for registering in many states

$199 to register; agent renewal $149

What puts Mainstay Filing first: $199 over the state fee registers you, with the registered agent not charged in year one and $149 a year after.

WI Registered Agent.org would save $100 across three years if the LLC stays in Wisconsin.

The registered agent is not charged in year one and costs $149 a year after that, in any state.

Inside the price

  • The registration filing, included
  • Registered agent, not charged in year one
  • One fee, any state

Inside, the good

  • No registered agent fee in year one
  • Identical fee in every state
  • $199 to file

Inside, the catch

  • Renewal $50 over WI Registered Agent.org
The Wisconsin specialist

2. WI Registered Agent.org: best for registering in a single place

$199 to register; agent renewal $99

WI Registered Agent.org sits second because three years of its service fees come to $397.

Inside the price

  • Wisconsin registration filing
  • A first year of agent service

Inside, the good

  • $99 a year from year two
  • $199 plus the state fee
  • Year one of the agent comes with it

Inside, the catch

  • Two states, two providers
The Wisconsin specialist

3. Wisconsin Registered Agent.co: best for another in-state option

$199 to register; agent renewal $99

Wisconsin Registered Agent.co sits third because three years of its service fees come to $397.

Its prices match WI Registered Agent.org exactly, so the order between them is close.

Inside the price

  • Wisconsin registration filing
  • A first year of agent service

Inside, the good

  • $99 a year from year two
  • Year one of the agent comes with it
  • $199 plus the state fee

Inside, the catch

  • Two states, two providers

Inside each price

#PickOpening priceEach year afterTotal, 3 yearsWhat is inside
1Mainstay Filing$199$149/yr$497the registration filing, included; registered agent, not charged in year one; one fee, any stateOpen Mainstay FilingPartner link. We may earn money if you buy.
2WI Registered Agent.org$199$99/yr$397wisconsin registration filing; A first year of agent serviceOpen WI Registered Agent.orgPartner link. We may earn money if you buy.
3Wisconsin Registered Agent.co$199$99/yr$397wisconsin registration filing; A first year of agent serviceOpen Wisconsin Registered Agent.coPartner link. We may earn money if you buy.
Prices as of November 13, 2026. The state's own fees are in the checklist below.

Opened up, question by question

When must an out-of-state LLC register here?

Any LLC formed elsewhere should file its registration with the Wisconsin Department of Financial Institutions, Division of Corporate and Consumer Services ahead of its first Wisconsin transaction.

peek at dfi.wi.gov, confirmed October 2026

How much does registration cost?

$100 goes to the state, and $199 more pays for help.

Over three years the state's fees reach $230, counting any recurring report. peek at dfi.wi.gov, confirmed October 2026

What registers the LLC?

The Foreign Registration Statement, Limited Liability Company (Form 521) is the filing, and the Wisconsin Department of Financial Institutions, Division of Corporate and Consumer Services receives it.

The state does not list a good standing certificate among its requirements.

What is due after the LLC registers?

Expect the annual report ($65).

The state frames the deadline as March 31.

Why is the stack in this order?

On what is inside the price (29%), Mainstay Filing comes out ahead.

Two layers carry most of the weight, total across three years (34%) and what is inside the price (29%).

An LLC registering out of state already works in two states, and the first pick can serve both.

The five layers

What Wisconsin requires to register

RequirementAmount or rulePeek at source
Registration fee$100peek at dfi.wi.gov, confirmed October 2026
Certificate from homeNot neededpeek at dfi.wi.gov, confirmed October 2026
Annual report$65peek at dfi.wi.gov, confirmed October 2026
What the state collects in three years$230Our total of the rows above
To check the total yourself, add the filing fee, the next two reports and any minimum tax. Costs without a set amount are left out.

More boxes to open

Do I still need an agent in my home state?

Most likely. Each state wants an agent of its own, and while a one-state service covers only one of them, Mainstay Filing covers every state.

What do the picks cost over three years?

Opened up over three years: Mainstay Filing at $497, WI Registered Agent.org at $397, Wisconsin Registered Agent.co at $397, with state fees on top.

Are the fees official?

The state-side figures were taken from Wisconsin's own publications, and the service prices from the price page each company posts. Dates for both appear on this page.

Does the law require one?

No. Owners can file with the state directly. A service saves time and can act as agent, but nothing makes you hire one.

Can I hire someone to register the LLC?

Handled: submitting the registration is part of every pick's service, and the state's fee stays level.

Which foreign registration service should I open first in Wisconsin?

Mainstay Filing is on top: the price is $199 in every state, and the first registered agent year is inside it. Under it sit WI Registered Agent.org and Wisconsin Registered Agent.co.

Originals behind this page

  1. Unpacking Wisconsin Department of Financial Institutions led us to dfi.wi.gov, confirmed August 2026, which you can open yourself
  2. Unpacking Wisconsin Department of Financial Institutions led us to dfi.wi.gov, confirmed August 2026, which you can open yourself
  3. Unpacking Wisconsin report due date led us to docs.legis.wisconsin.gov, confirmed August 2026, which you can open yourself
  4. Unpacking Wis led us to dfi.wi.gov, confirmed August 2026, which you can open yourself
  5. Unpacking Wisconsin formation fee: Filing fee led us to dfi.wi.gov, confirmed October 2026, which you can open yourself
  6. Unpacking Wisconsin registered agent statute led us to docs.legis.wisconsin.gov, confirmed October 2026, which you can open yourself
  7. Unpacking DFI Form 521, foreign registration led us to dfi.wi.gov, confirmed October 2026, which you can open yourself
  8. Unpacking DFI file online led us to dfi.wi.gov, confirmed October 2026, which you can open yourself
  9. Unpacking Wis led us to docs.legis.wisconsin.gov, confirmed October 2026, which you can open yourself
  10. Unpacking DFI Form 524, withdrawal of led us to dfi.wi.gov, confirmed October 2026, which you can open yourself
  11. Unpacking Wis led us to docs.legis.wisconsin.gov, confirmed November 2026, which you can open yourself
  12. Mainstay Filing Wisconsin service page, read November 13, 2026
  13. WI Registered Agent.org pricing page, read November 13, 2026
  14. Wisconsin Registered Agent.co pricing page, read November 13, 2026