Illinois Business Entity Name Reservation & Naming Requirements Guide

Illinois-State-ShapeIn this article, we will be discussing step by step instructions on how to select a business name and file for name reservation in Illinois.

Before officially forming your business (LLC, Corporation, Partnership) in Illinois, you may consider reserving the name for your company first.

Reserving business name is especially helpful in cases when you are sure to form the business in the next few months but are not ready yet. Name reservation can protect your PERFECT business name, till the time you are ready for filing.

The business name can be reserved for the period of 90 days which can be further renewed. The business name reservation can also be transferred.

Illinois Business Entity Naming Requirement for LLCs and Corporations

Illinois Secretary of State has mandated certain requirements which you must keep in mind while selecting the business name.

The chosen business name must be unique and distinguishable from any existing business entity name registered with Secretary of State. Also any difference in grammar, similarly sounding business name, or using stop words does not make the business name unique and it will lead to the name being rejected.

For example, the following names are not distinguishable:

  • Justin Plumber LLC vs The Justin Plumber LLC
  • Mango Farm LLC vs Mango Farms LLC
  • Jake & Mary Corporation vs Jake and Mary Corporation

Required suffix in the business name:

LLC Naming requirements
Must end with either “Limited liability company”, “L.L.C.” or “LLC”
Corporation Naming requirements
Must end with either “Corporation”, “Company”, “Incorporated” or “Limited” or an abbreviation of one of such words.
Prohibited Words
  • LLC name cannot contain “Corporation,” “Incorporation,” “Association,” “Limited,” “Limited Partnership” or any abbreviation thereof
  • Certain words such as bank, insurance,  trust etc cannot be included in the name without prior approval from the concerned authorities.

How to Check for Business Name Availability in Illinois

To make sure the business name you’ve chosen is unique and distinguishable, you must search through Illinois  SOS business records. We have written an in-depth tutorial on how to search for a business name in Illinois.

How to File for Business Name Reservation in Illinois

Business name reservation can be filed over mail. The process can take upto 5 days

By Mail

Download Form
FeesLLC: $25 and $50 expedite fee
Partnership: $50 and $50 expedite fee
Corporation: $25 and $50 expedite fee
AddressLLC & Partnership
Secretary of State
Department of Business Services
Limited Liability Division
501 S. Second St., Rm. 357
Springfield, IL 62756Corporation
Department of Business Services
501 S. Second St., Rm. 350
Springfield, IL 62756
Processing TimeWithin 5 days after the receipt
  1. Download the name reservation form (links are shared above).
  2. Fill the form with the requested details.
  3. Include the money order or check drawn in favor of “Secretary of State“.
  4. Send the filled form to the address mentioned above.


For any queries, you can contact the SOS at 1800-252-8980 during business hours.


Last Updated: 15/01/2018

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