Proving Whistleblower Retaliation in California (Labor Code 1102.5)

Legal Guides · Updated October 2026

California makes whistleblower retaliation easier to prove than most employment claims. Under Labor Code 1102.5 and 1102.6, an employee only has to show that reporting was a contributing factor in the employer’s decision. Then the burden shifts to the employer to prove, by clear and convincing evidence, that it would have done the same thing anyway. Here is how that works in practice.

On this page: What you must show · The burden-shifting test · Evidence that proves retaliation · Common employer defenses · What you can recover · FAQ

What You Must Show

1. Protected activity. You disclosed information you reasonably believed showed a violation of a federal, state or local law, rule or regulation, to a government agency, a public body, a supervisor or another employee with authority to investigate. Refusing to participate in illegal activity is also protected. The California Supreme Court held in 2023 that a report is protected even if the person you reported to already knew about the violation.
2. An adverse action. Termination, demotion, discipline, a pay cut, a bad review, reassignment or other action that materially affects your employment.
3. A connection. Your protected activity was a contributing factor in the adverse action.

You do not have to prove that a law was actually broken, only that your belief was reasonable.

The Burden-Shifting Test

Labor Code section 1102.6 sets the framework, as the California Supreme Court confirmed in Lawson v. PPG Architectural Finishes (2022):

1. The employee must prove by a preponderance of the evidence that the protected activity was a contributing factor in the adverse action. It does not have to be the main or only reason; any factor that, alone or with others, tends to affect the outcome is enough.
2. The employer must then prove by clear and convincing evidence that it would have taken the same action for legitimate, independent reasons even if the employee had not engaged in protected activity.

That second step is a demanding standard, and it is why these claims often survive summary judgment and carry real settlement value. In addition, since January 1, 2024 (SB 497), an adverse action within 90 days of protected activity creates a rebuttable presumption of retaliation.

Evidence That Proves Retaliation

• Timing: adverse treatment soon after the report, especially within 90 days
• Knowledge: proof the decision-maker knew about your report
• A change in treatment: strong reviews, raises or praise before the report; criticism, write-ups or exclusion after
• Shifting explanations: different reasons given in the termination meeting, the unemployment response and the lawsuit
• Comparators: coworkers who did not report and were treated better for the same conduct
• Departures from policy: skipped progressive discipline, an unusual investigation, or a rushed decision
• Statements: comments about your report, “loyalty,” or being a “problem”
• Your own records: a timeline, emails and notes made at the time

See signs of workplace retaliation and what to do now.

Common Employer Defenses, and How They Are Tested

• “It was performance.” Tested against your review history, how others were treated, and when the concerns first appeared.
• “It was a reorganization or layoff.” Tested by who chose the positions, the selection criteria, and whether the role was really eliminated or later refilled.
• “We didn’t know about the report.” Tested by emails, meeting notes and testimony about who was told.
• “We would have done it anyway.” Under 1102.6, the employer must prove this by clear and convincing evidence, not just assert it.

What You Can Recover

• Lost wages and benefits, including bonuses, commissions and equity, past and future
• Emotional distress damages
• Punitive damages where the employer acted with malice, oppression or fraud
• A civil penalty of up to $10,000 per violation, awarded to the employee
• Reasonable attorney’s fees for a prevailing employee

A lawsuit under 1102.5 must generally be filed within three years, and a Labor Commissioner complaint within one year. Claims under 1102.5 are brought against the employer, not individual supervisors. See California whistleblower retaliation, and for public-company employees, SOX retaliation.

Frequently Asked Questions

What does “contributing factor” mean?

Any factor that, alone or with other factors, tends to affect the outcome of the decision. Your report does not have to be the main or only reason for the adverse action.

What is the 90-day presumption?

Since 2024, if an employer takes adverse action within 90 days of protected activity, California law presumes retaliation. The employer can rebut the presumption, but it shifts the starting point in the employee’s favor.

Is a report to my supervisor protected if they already knew about the problem?

Yes. The California Supreme Court held in 2023 that a disclosure is protected even if the recipient already knew about the violation.

Can I sue my supervisor personally under 1102.5?

Generally no. Claims under Labor Code 1102.5 are brought against the employer.

How long do I have to file?

Generally three years for a lawsuit under Labor Code 1102.5 and one year for a Labor Commissioner complaint. Other related claims may have shorter deadlines.

Related guides: Retaliated against for reporting fraud? · Signs of workplace retaliation · How long to sue your employer

This guide provides general information about California and federal law as of October 2026. It is not legal advice, and reading it does not create an attorney-client relationship. Every situation depends on its facts, so speak with a lawyer about yours.