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Illinois law requires that individuals conducting or transacting a business under any name other than the real names of the owners must file an Assumed Name Certificate with the County Clerk in the county in which the business is located. If the business will be incorporated, a corporation, or an LLC, file with the Illinois Secretary of State at 217-782-7880, not the County Clerk. For retail tax information, call 217-524-4772.
If there is any change in the address, name of owner(s) or address, it is necessary to file a Supplemental Assumed Name Certificate (PDF) with the County Clerk's Office, indicating the change. The filing fee for this is $1.50, no personal checks accepted. Publication is again required if the change involves: adding owner(s) names to the business, closing the business, withdrawing owner(s) names when withdrawal involves 25% or more of the total ownership, or change of business address.
Most of these procedures can be accomplished by mail to the County Clerk's Office. If you have any questions, please call the Clerk's Office at 309-558-3569.