Form LLC-45.5 at a glance
What it is: Form LLC-45.5 is the Illinois Limited Liability Company Act Application for Admission to Transact Business.
Where and when to file: Secretary of State Department of Business Services Limited Liability Division, 501 S. Second St., Rm. 351, Springfield, IL 62756.
What to bring and attach to Form LLC-45.5
This application is accompanied by a Certificate of Good Standing or Existence, duly authenticated within the last 60 days, by the officer of the state or country wherein the LLC is formed.
Payment must be made by certified check, cashier's check, Illinois attorney's check, C.P.A.'s check or money order payable to Secretary of State. If check is returned for any reason this filing will be void.
A filled-in Form LLC-45.5 example: Sample Widgets LLC applies to transact business in Illinois
How to fill out Form LLC-45.5, box by box
Limited Liability Company name and Assumed name
Enter the Limited Liability Company name (see Note 1).
Note 1: The name must contain the term Limited Liability Company, LLC or L.L.C.
The name cannot contain any of the following terms: "Corporation," "Corp." "Incorporated," "Inc.," "Ltd.," "Co.," "Limited Partnership" or "LP."
However, a limited liability company that will provide services licensed by the Illinois Department of Financial and Professional Regulation must instead contain the term Professional Limited Liability Company, PLLC or P.L.L.C. in the name.
Enter the Assumed name. This item is only applicable if the company name in Item 1 is not available for use in Illinois, in which case form LLC 1.20 must be completed and submitted with this application.
Jurisdiction of organization, Date of organization and Period of duration
Enter the Jurisdiction of organization.
Enter the Date of organization.
Enter perpetual for Period of duration unless there is a date of dissolution provided in the agreement, in which case enter that date.
Address of the principal place of business
Enter the Address of the principal place of business. P.O. Box alone or c/o is unacceptable.
Enter the Number, Street and Suite #, then the City, State and ZIP.
Registered agent and Registered office
Enter the Registered agent: First Name, Middle Name and Last Name.
The registered agent must reside in Illinois. If the agent is a business entity, it must be authorized to act as agent in this state.
Enter the Registered office: Number, Street and Suite #, then City and ZIP. P.O. Box alone or c/o is unacceptable.
Date on which company first conducted business in Illinois
If applicable, enter the date on which company first conducted business in Illinois.
Purpose(s) for which the company is organized
Enter the Purpose(s) for which the company is organized and proposes to conduct business in Illinois (see Note 2).
Note 2: A professional limited liability company must state the specific professional service or related professional services to be rendered by the professional limited liability company.
Management and the names of managers
Check one: the Limited Liability Company is managed by the manager(s) or has management vested in the member(s).
List names and business addresses of all managers and any member with the authority of manager.
Dated, Signature and Name and Title
The undersigned affirms, under penalties of perjury, having authority to sign hereto, that this application for admission to transact business is to the best of my knowledge and belief, true, correct and complete.
Enter Dated as Month, Day, Year.
Sign on the Signature line and type or print Name and Title.
If applicant is signing for a company or other entity, state name of company or entity.
More rules for Form LLC-45.5
The Illinois Secretary of State is hereby appointed the agent of the Limited Liability Company for service of process under circumstances set forth in subsection (b) of Section 1-50 of the Illinois Limited Liability Company Act.
Submit in duplicate.
Type or print clearly.
Common questions about Form LLC-45.5
Where do I file it?
Secretary of State Department of Business Services Limited Liability Division, 501 S. Second St., Rm. 351, Springfield, IL 62756.
Are there fees?
Filing Fee: $150 (checked November 1, 2026).
Sources
[1] Form LLC-45.5 (May 2018), Illinois Limited Liability Company Act Application for Admission to Transact Business, Illinois Secretary of State (the Official source link on this page).
