Accountants handle clients' most sensitive financial information and file tax returns that carry legal consequences. A calculation error, missed deadline, or audit issue can result in a malpractice lawsuit. An LLC or PLLC protects your personal assets from professional liability claims and is increasingly required for CPA firm registration in many states. Chicago is home to ~300K businesses and has a population of 2.7M, making it a thriving market for accountants. Forming your LLC in IL provides personal asset protection and positions your accountants business for growth in the Chicago metro area.