A Federal Employer Identification Number (FEIN) is not required for all business types. If you are a sole proprietor or single-member LLC with no employees, you are not required to have a FEIN. All other businesses must request a FEIN from the
IRS website or by calling 1 800-829-4933.
NOTE: If you are a single-member LLC and do not have a FEIN, you will need to complete the paper version of the
Form REG-1, Illinois Business Registration Application.