Yes. Illinois is an "employment at-will" state, meaning that an employer or employee may terminate the relationship at any time, without any reason or cause. Employee must submit reimbursement request within 30 calendar days unless an employer policy allows for additional time to submit.There are absolutely no Illinois state laws or federal laws which require an employer to give any notice whatsoever to employees when they fire them. Both WARN Acts requires certain employers to notify workers 60 days in advance of "plant closings" or "mass layoffs. The amendment also updated the employee notice forms staffing companies must provide their workers.