What is professional malpractice in Illinois?

It's when a licensed professional — an attorney, accountant, financial advisor, or architect — fails to meet the accepted standard of their field and causes you financial harm. Unlike medical malpractice, these cases usually involve economic rather than physical losses.

What makes a strong professional malpractice case in Illinois?

A clear, demonstrable error (a missed deadline, bad advice, or mishandled funds), an expert who will testify the standard of care was breached, and documented financial losses traceable to the error. Engagement letters and billing records are critical.

Illinois · Free Case Value Calculator

Illinois Professional Malpractice Case Value Calculator

Q: How is a professional malpractice settlement calculated in Illinois?

Damages equal the financial loss the error actually caused. For attorney malpractice, Illinois typically requires proving the "case within a case" — that you would have won the underlying matter but for the error. Expert testimony from the same profession is almost always required.

Q: How long do I have to file a professional malpractice claim in Illinois?

Illinois generally allows about 2 years, often running from when you discovered (or should have discovered) the error. For attorney malpractice, the "continuous representation" rule can pause the clock while the lawyer keeps handling the matter.

A Illinois professional malpractice case holds a licensed professional accountable for falling below the standard of their profession and causing financial loss. Attorney, accounting, and financial-advisor malpractice are the most common, and expert testimony from someone in the same field is almost always required to establish the breach.

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Quick answer

In Illinois, you generally have 2 years to file a professional malpractice claim. What your case is worth depends on your specific damages and Illinois's laws — use the calculator below for a free estimate of your low-to-high range.

How Illinois Law Affects Your Professional Malpractice Case

Damages equal the financial loss the professional's error actually caused — what you lost or failed to gain because of it. In legal malpractice, Illinois typically requires proving the "case within a case": that you would have won the underlying matter but for the attorney's error. Engagement letters, billing records, and the professional's own file are critical evidence.

Illinois generally allows about 2 years to file, in line with the national average of 2.3 years, often running from when you discovered (or should have discovered) the error. For attorney malpractice, the "continuous representation" rule can pause the clock while the lawyer keeps handling the matter.

Key Illinois Laws

Filing Deadline

2 years

in line with the national average of 2.3 years

Negligence System

Modified Comparative Fault (51% Bar)

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How Does Illinois Compare?

2 yrs

Filing Deadline

Avg: 2.3 yrs

Modified

Fault System

Modified Comparative Fault (51% Bar)

Illinois Professional Malpractice FAQs

Related Illinois Calculators

Illinois Medical Malpractice Illinois Insurance Bad Faith Illinois Product Liability Illinois Civil Rights

Had Your Accident in a Different State?

Which state's law applies depends on where the incident occurred, not where you live. Compare neighboring states:

Wisconsin

3-yr Statute of Limitations · Modified

Iowa

2-yr Statute of Limitations · Modified

Missouri

2-yr Statute of Limitations · Pure

Kentucky

1-yr Statute of Limitations · Pure

Legal Disclaimer

This calculator uses Illinois's statutes as of 2026-03-06. Laws change frequently. This tool provides estimates for informational purposes only and does not constitute legal advice. Verify current rules with a Illinois-licensed attorney before making decisions about your case. Learn about our methodology.

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