Before applying for business license, its important to make sure you register your business with the appropriate government entities
If you plan to do business as a Sole Proprietor or General Partnership in Illinois, under an assumed name (a name other than your own), you will need to obtain an Assumed Name Certificate from the Cook County Clerk’s Office.
Illinois based businesses may file a new application as a Limited Partnership (LP), Limited Liability Partnership (LLP), Limited Liability Corporation (LLC), Corporation, or Not-for-Profit Corporation (NFP). You will be provided a State of Illinois File Number, which you will need to provide on your license application.
Businesses not based in Illinois are considered .foreign. and must file an application for authority to transact business in Illinois. You will be provided a State of Illinois File Number, which you will need to provide on your license application.
Obtain a Federal Employer Identification Number (FEIN) A Federal Employer Identification Number (FEIN) is also known as a Federal Tax Identification Number, and is used to identify a legal business entity. Businesses are required to obtain a FEIN to file and pay any federal tax obligation.
Obtain an Illinois Department of Revenue (IDOR) Account ID (formerly Illinois Business Tax Number (IBT)) . You must register with the Illinois Department of Revenue if you conduct business in Illinois or with Illinois customers. This includes sole proprietors (individual or husband/wife), and all legal business entities, including exempt organizations, who plan to hire employees, buy or sell products wholesale or retail, or manufacture goods.