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Register Your Wisconsin LLC in Illinois

Step-by-step foreign qualification requirements, fees, and filing instructions for Wisconsin LLCs expanding into Illinois.

Cost Summary

Illinois filing fee: $150
Wisconsin Certificate of Status: $10
Annual obligation in Illinois: $75/year
Estimated year 1 total: $235

Note: Year 1 total includes the $150 filing fee in Illinois, the $10 Certificate of Status fee from Wisconsin, and $75 in first-year Illinois state charges. Registered agent fees (typically $100-$200/year) are not included.

Wisconsin data last reviewed Aug 15, 2026 · wdfi.org

Illinois data last reviewed Aug 15, 2026 · ilsos.gov

How to register your Wisconsin LLC in Illinois

Check name availability in Illinois

Before filing, verify that your LLC name (or a distinguishable variation) is available in Illinois. If your exact name is already taken, you may need to register under a fictitious or assumed name.

Search Illinois business names ↗

Get a Certificate of Status from Wisconsin

Illinois requires a Certificate of Status from Wisconsin to prove your LLC is in good standing. The fee is $10. Available to order online. No expiration printed; foreign-state applications typically require dating within 30-90 days.

Order from Wisconsin ↗

File the Application for Admission to Transact Business (Form LLC-45.5) in Illinois

Submit your application along with the Certificate of Status and the $150 filing fee. Processing time is 10-45 days by mail; same-day if filed in person with the $100 expedite. Expedited processing available for $100, and it requires in-person submission at the Springfield or Chicago office. Not available by mail and not available online..

Illinois filing portal ↗

Appoint a registered agent in Illinois

You must designate a registered agent with a physical address in Illinois to accept legal documents on behalf of your LLC. This is required as part of the foreign qualification application.

Ongoing compliance in Illinois

Annual report: $75/year
Report due: Anniversary month
Processing time: 10-45 days by mail; same-day if filed in person with the $100 expedite
Expedite: $100, and it requires in-person submission at the Springfield or Chicago office. Not available by mail and not available online.

Important to know about Illinois

Operating unregistered costs $100 for each month or fraction of a month, so the penalty compounds faster than in most states.

Already operating in Illinois without registering? Our guide to what Illinois charges unregistered LLCs covers fines, back fees, and court access.

Activities that do NOT require registration in Illinois

Maintaining, defending, or settling a lawsuit or other proceeding
Holding meetings of members or managers, or carrying on internal company affairs
Maintaining bank accounts
Maintaining an office or agent to transfer, exchange, or register the company's own securities, or keeping a trustee or depositary for them
Selling through independent contractors
Soliciting or obtaining orders, by mail or through employees or agents, if orders require acceptance outside the state before becoming contracts
Owning real or personal property, and nothing more
Conducting an isolated transaction completed within 120 days that is not part of repeated similar transactions
Having a member or manager who is a resident of Illinois

Under 805 ILCS 180/45-47, all 9 statutory items. Illinois diverges from the uniform act three ways: the isolated-transaction window is 120 days rather than 30; there is a unique safe harbor for having a member or manager who is an Illinois resident; and the list omits indebtedness, debt collection and interstate commerce entirely. Subsection (b) disclaims service of process only, with no taxation clause.

Need a registered agent in Illinois?

A registered agent is required for foreign qualification. These services operate in all 50 states.

Get Northwest Registered Agent ↗

Recommended · $125/year · Privacy included

Registered Agents Inc

$200/year · Report filing included, state fees extra

Visit site ↗

Harbor Compliance

$99 first year, then $149/year · Full-service compliance option

Visit site ↗

Not sure which service fits? Our full Northwest Registered Agent review and Harbor Compliance review cover pricing, renewal terms, and where each one fits.

Need a business address in Illinois?

A virtual mailbox gives your LLC a professional address in Illinois for mail forwarding, public filings, and banking, without leasing office space.

Northwest Mail Forwarding $20/mo

Unique suite number + unlimited digital mail scanning

Learn more ↗

Registered Agents Inc $50/year

10 mail scans/year + unique suite number

Learn more ↗

Independent mailbox providers

iPostal1

Largest address network in the US. Best budget option for a registered business address.

From $14.99/mo Visit site ↗

Alliance Virtual Offices

Real commercial address inside a staffed office center, with an Address Certification Letter for banking and registration.

From $49/mo Visit site ↗

Bizee

Commercial street address with unlimited mail scanning, cheapest bundled with Bizee formation.

$29/mo Visit site ↗

Check your full compliance

Use our free tool to check if you need to register in additional states.

Start free compliance check ↗

Sources

https://www.ilsos.gov/departments/business_services/home.html

This page provides general information based on publicly available state requirements. It is not legal advice. Verify all fees and requirements with the Illinois Secretary of State before filing.