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Formation ClassClass is in session: LLC paperwork, state by state.

Class 3 · Wisconsin

Foreign LLC Registration Class, Wisconsin (2026): 4 Assignments and the 3 Best Services

Pop quiz answer for Wisconsin in 2026: Wisconsin Registered Agent.co ($199), WI Registered Agent.org ($199) and Mainstay Filing ($199) are the services to use for registering an LLC from another state, best grade first. The class's 4 assignments cover the filing, the $100 fee and what you owe afterward.

Taught by the Formation Class faculty

Need-to-know facts

What the state charges to register$100dfi.wi.gov, last read in October 2026
Annual report$65Annual report
State fees over three years$230State charges only
Assignments in this class4From first to last

Class goals

  • When the rule kicks in
  • The filing, its price and its office
  • The recurring filing
  • How the picks stack up

Who we would hire in Wisconsin

The teacher's five criteria are on how we grade, and they decide the order.
Top of the class

1. Wisconsin Registered Agent.co: best for a budget registration

Service $199, renewal $99 a year

We start with Wisconsin Registered Agent.co; $199 above the state fee, first agent year covered, and $99 a year afterward.

Mainstay Filing loses to it on three-year tuition, and tuition is a big slice of the grade.

Covered by the tuition

  • The filing is done for you
  • One year of agent service is part of the price

Strengths

  • $199 above the state fee
  • The agent renews at $99
  • Agent covered in year one

Weak spots

  • The home state needs a different agent
In-state service

2. WI Registered Agent.org: best for another Wisconsin option

Service $199, renewal $99 a year

Second place goes to WI Registered Agent.org, since $199 above the state fee, first agent year covered, and $99 a year afterward.

Wisconsin Registered Agent.co and this service cost the same.

Covered by the tuition

  • The filing is done for you
  • One year of agent service is part of the price

Strengths

  • The agent renews at $99
  • Agent covered in year one
  • $199 above the state fee

Weak spots

  • The home state needs a different agent
All fifty states

3. Mainstay Filing: best for LLCs on the move

Service $199, renewal $149 a year

Our third pick, Mainstay Filing: $199 on top of the state fee in any state, with year one of the agent included.

Add up three years: it comes to $100 more than Wisconsin Registered Agent.co.

Agent service past the first year is $149 yearly.

Covered by the tuition

  • The registration filing
  • The registered agent costs nothing in year one
  • Covers all fifty states

Strengths

  • First year of the agent is included
  • All fifty states covered
  • $199 to register

Weak spots

  • Renewal $50 above Wisconsin Registered Agent.co's

Grades and prices together

#ServiceFirst yearFrom year twoThree-year total
1Wisconsin Registered Agent.co$199$99/yr$397Visit Wisconsin Registered Agent.coPartner link. We may earn money if you buy.
2WI Registered Agent.org$199$99/yr$397Visit WI Registered Agent.orgPartner link. We may earn money if you buy.
3Mainstay Filing$199$149/yr$497Visit Mainstay FilingPartner link. We may earn money if you buy.
Company prices as listed on November 13, 2026. None of the rows includes the $100 state fee.

Registering with Wisconsin, assignment by assignment

  1. Assignment
    1

    Find out whether you have to register

    Vocabulary word: a foreign LLC is one formed in a different state. It registers before it does business in Wisconsin. What happens when an LLC operates unregistered: Signed contracts keep their force (Wis. Stat. 183.0902(3)).

    Textbook page: dfi.wi.gov, last read in October 2026

  2. Assignment
    2

    Name a registered agent for Wisconsin

    Every LLC must name a registered agent with an in-state street address. The address has to be an actual physical location with a street address in Wisconsin, not solely a P.O. box, mailbox service or answering service.

    The grade list covers this role.

    Textbook page: docs.legis.wisconsin.gov, last read in October 2026

  3. Assignment
    3

    Prepare, sign and send the Foreign Registration Statement, Limited Liability Company

    Finish the Foreign Registration Statement, Limited Liability Company (Form 521), tuck in $100, and send everything to the Wisconsin Department of Financial Institutions, Division of Corporate and Consumer Services.

    Textbook page: dfi.wi.gov, last read in October 2026

  4. Assignment
    4

    Stay registered

    The repeat assignment is the annual report, $65, March 31.

What this class costs

EntryPaid toSum
Registering the LLCState office$100
Annual reportState office$65
Service, if you hire oneThe service$199 for year one
State fees for the first three yearsState office$230
Filing fee plus two later reports plus any minimum tax makes the state's three-year total. The pages listed below show where each figure came from.

The reasoning behind the grades

On tuition across three years (30% of the grade) came out on top, with close behind.

Wisconsin Registered Agent.co comes to $397 across three years, a saving of $100 next to Mainstay Filing.

Wisconsin pop quiz

What does an LLC from elsewhere pay to register in Wisconsin?

$100 as the official fee. The graded services add $199.

Which form do I file to register?

The Foreign Registration Statement, Limited Liability Company (Form 521) is the one to track down, and it goes to the Wisconsin Department of Financial Institutions, Division of Corporate and Consumer Services.

What if the LLC does business there without registering?

Signed contracts keep their force (Wis. Stat. 183.0902(3)).

What is due after registering?

Once you are registered, the LLC owes the annual report, billed at $65 each time.

Which services are in this lesson?

We grade three: Wisconsin Registered Agent.co ($199), WI Registered Agent.org ($199) and Mainstay Filing ($199).

Which service should handle the registration?

Wisconsin Registered Agent.co, WI Registered Agent.org and Mainstay Filing, from the highest grade to the lowest.

See also

Textbook pages and extra reading

  1. Class notes on Wisconsin Department of Financial Institutions, Division of Corporate come straight from dfi.wi.gov (reread August 2026).
  2. Class notes on Wisconsin Department of Financial Institutions, Division of Corporate come straight from dfi.wi.gov (reread August 2026).
  3. Class notes on Wisconsin report due date come straight from docs.legis.wisconsin.gov (reread August 2026).
  4. Class notes on Wis come straight from dfi.wi.gov (reread August 2026).
  5. Class notes on Wisconsin formation fee: Filing fee, official source come straight from dfi.wi.gov (reread October 2026).
  6. Class notes on Wisconsin registered agent statute come straight from docs.legis.wisconsin.gov (reread October 2026).
  7. Class notes on DFI Form 521, foreign registration statement for an come straight from dfi.wi.gov (reread October 2026).
  8. Class notes on DFI file online come straight from dfi.wi.gov (reread October 2026).
  9. Class notes on Wis come straight from docs.legis.wisconsin.gov (reread October 2026).
  10. Class notes on DFI Form 524, withdrawal of registration come straight from dfi.wi.gov (reread October 2026).
  11. Class notes on Wis come straight from docs.legis.wisconsin.gov (reread November 2026).
  12. pricing page from Wisconsin Registered Agent.co as of November 13, 2026
  13. pricing page from WI Registered Agent.org as of November 13, 2026
  14. Wisconsin service page from Mainstay Filing as of November 13, 2026