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No jargon · Wisconsin

3 Best Foreign Registration Services in Wisconsin (2026): Our Honest Take

For foreign registration services in Wisconsin, here is our 2026 ranking: Mainstay Filing ($199), WI Registered Agent.org ($199) and Wisconsin Registered Agent.co ($199). The state's fee is $100; service fees for three years are $397 to $497.
From the LLC Plainly editorial team

Short answer

What the state charges
$100
Certificate required?
Skip it
Once you're registered
$65, annual report
Our picks
Mainstay Filing, WI Registered Agent.org then Wisconsin Registered Agent.co

Wisconsin: the ranking

Prices come from each company's own pricing. Here's how we pick.
Start here

1. Mainstay Filing: best for adding several states

Registration is $199 plus the state fee, and the agent is $149 later

Number one is Mainstay Filing, since its $199 fee is the same in every state, and the first registered agent year comes with it.

That $100 gap to WI Registered Agent.org over three years is what coverage in every state costs.

Starting in year two, the registered agent runs $149 a year.

Your money buys

  • Your registration, filed
  • Registered agent, free in year one
  • One service fee in all fifty states

The good

  • You skip the registered agent fee in year one
  • Set for the next state you add
  • Registers you for $199

Trade-offs

  • WI Registered Agent.org charges $50 less to renew the agent
Wisconsin only

2. WI Registered Agent.org: best for a lean registration

Registration is $199 plus the state fee, and the agent is $99 later

Number 2 is WI Registered Agent.org: registering costs $199 above the state fee and the agent is covered in year one, then $99 a year.

Your money buys

  • State registration done
  • First-year agent comes with it

The good

  • The agent renews at $99
  • Agent covered in year one
  • Just $199 to register

Trade-offs

  • Nothing outside this state
Wisconsin only

3. Wisconsin Registered Agent.co: best for adding one more state

Registration is $199 plus the state fee, and the agent is $99 later

Number 3 is Wisconsin Registered Agent.co: registering costs $199 above the state fee and the agent is covered in year one, then $99 a year.

The same published prices as WI Registered Agent.org, so go with whichever you like.

Your money buys

  • State registration done
  • First-year agent comes with it

The good

  • Agent covered in year one
  • The agent renews at $99
  • Just $199 to register

Trade-offs

  • Nothing outside this state

How they compare

#CompanyFirst yearRenewalOver three yearsIn the price
1Mainstay Filing$199$149/yr$497your registration, filed; registered agent, free in year one; one service fee in all fifty statesCheck out Mainstay FilingPartner link. We may earn money if you buy.
2WI Registered Agent.org$199$99/yr$397state registration done; First-year agent comes with itCheck out WI Registered Agent.orgPartner link. We may earn money if you buy.
3Wisconsin Registered Agent.co$199$99/yr$397state registration done; First-year agent comes with itCheck out Wisconsin Registered Agent.coPartner link. We may earn money if you buy.
Each company's listed prices on November 13, 2026. State fees come on top and don't change by pick.

The questions, one by one

Is registering required for my out-of-state LLC?

Register first, then do business in Wisconsin, if your LLC came from another state.

dfi.wi.gov, last seen October 2026

What's the price of foreign registration?

Registering on your own is $100. Add $199 for a service.

The state's three-year fees, registration included, add up to $230. dfi.wi.gov, last seen October 2026

Which form do I file, and where?

You file the Foreign Registration Statement, Limited Liability Company (Form 521) with the Wisconsin Department of Financial Institutions, Division of Corporate and Consumer Services. That's the whole filing.

The filing needs no proof from the home state.

What do I owe after registering?

You'll file a annual report on schedule ($65).

The schedule says March 31.

Why did the first pick win?

Mainstay Filing leads on work taken off your hands, a 31% check.

33% of the score is cost across three years, 31% is work taken off your hands, and three smaller checks split ties.

An out-of-state LLC lives in two states, and the first pick can look after both.

How we pick

Wisconsin requirements, with sources

The ruleThe answerCheck it
Cost to register$100dfi.wi.gov, last seen October 2026
Good standing proofSkip itdfi.wi.gov, last seen October 2026
Annual report$65dfi.wi.gov, last seen October 2026
Three-year state total$230Our total of the lines above
Each figure above links to the state's official page. The final line is our addition of the filing, two reports and any minimum tax, and it leaves out variable costs.

A few more

Does my home state need an agent too?

Yes. The state where you formed the LLC keeps its own agent rule, and Mainstay Filing can handle both states on one account.

How do the three-year costs stack up?

Mainstay Filing $497; WI Registered Agent.org $397; Wisconsin Registered Agent.co $397, not counting state fees.

What are the sources?

Wisconsin's fee schedules and forms for state costs; each company's price page for service costs.

Does the state make me use a service?

No. The state takes filings straight from owners. A service saves you time and can serve as your agent, but nobody makes you hire one.

Will a company file this for me?

All of them do. The state fee doesn't change.

Who tops the list in Wisconsin?

Mainstay Filing is on top because you pay $199 plus Wisconsin's fee, skip the registered agent charge in year one and then pay $149 a year; WI Registered Agent.org and Wisconsin Registered Agent.co follow.

What we used for this page

  1. Wisconsin Department of Financial Institutions (dfi.wi.gov), last confirmed August 2026
  2. Wisconsin Department of Financial Institutions (dfi.wi.gov), last confirmed August 2026
  3. Wisconsin report due date (docs.legis.wisconsin.gov), last confirmed August 2026
  4. Wis (dfi.wi.gov), last confirmed August 2026
  5. Wisconsin formation fee: Filing fee (dfi.wi.gov), last confirmed October 2026
  6. Wisconsin registered agent statute (docs.legis.wisconsin.gov), last confirmed October 2026
  7. DFI Form 521, foreign registration (dfi.wi.gov), last confirmed October 2026
  8. DFI file online (dfi.wi.gov), last confirmed October 2026
  9. Wis (docs.legis.wisconsin.gov), last confirmed October 2026
  10. DFI Form 524, withdrawal of (dfi.wi.gov), last confirmed October 2026
  11. Wis (docs.legis.wisconsin.gov), last confirmed November 2026
  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