If your company hired an attorney who made a serious error, you may have grounds for a legal malpractice claim. California law sets clear requirements for these cases and missing any one of them can end your claim before it starts.
The four elements you must prove
California courts require you to establish four elements to win a legal malpractice case. Each element must be proven by a preponderance of the evidence. You will need to show:
- Attorney-client relationship: Your company formally retained the attorney, typically shown through a retainer agreement or billing records.
- Breach of duty: The attorney failed to perform at the level a reasonably competent lawyer would in the same situation.
- Causation: The attorney’s error directly caused your company’s loss, not some other factor.
- Actual damages: Your business suffered measurable financial harm as a result.
Every element must hold. If even one fails, your claim does not survive.
The “case within a case” challenge
Causation is the hardest element to prove. Under California case law, you must show your company would have won the underlying matter without the attorney’s mistake. This is known as the “case within a case”: you essentially retry the original dispute inside the malpractice lawsuit. Expert witness testimony is almost always required to meet this standard.
Deadlines you cannot miss
Under California Code of Civil Procedure Section 340.6, your company must file within one year of discovering the error or four years from the date it occurred, whichever comes first. The one-year clock may pause if the attorney continued to represent you on the same matter or deliberately concealed the mistake. These tolling rules are narrow. Do not rely on them without legal guidance.
Common errors that support a claim
Not every mistake rises to malpractice. However, certain attorney failures frequently support viable claims:
- Missed deadlines: Failing to file within a statute of limitations can permanently bar a case.
- Conflict of interest: Representing adverse parties without disclosure violates the duty of loyalty.
- Defective documents: Drafting contracts or corporate agreements with material errors.
- Flawed legal advice: Misapplying law in securities, mergers or other complex business matters.
These errors must still cause quantifiable financial harm to your company.
Before you move forward
Legal malpractice claims are among the most complex cases in civil litigation. An attorney can help you understand your options and evaluate whether your facts meet California’s legal standard.