Employment

How Employers Defend Equal Pay Claims — and Where Those Defenses Break

Once you show a coworker of another sex, race, or ethnicity earns more for substantially similar work, California law does something unusual: it shifts the burden to your employer. Under Labor Code § 1197.5, the employer must affirmatively demonstrate that specific lawful factors explain the pay difference — all of it, not most of it. There are exactly four such factors, each is narrower than employers assume, and the two excuses workers hear most often — “he negotiated better” and “that’s what she made at her last job” — are not on the list.

How Employers Defend Equal Pay Claims — and Where Those Defenses Break
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Not by itself. Negotiation is not one of the four statutory factors, and an employer relying on it must still tie the outcome to a bona fide factor that is job-related and consistent with business necessity. If men's negotiations are systematically rewarded and women's aren't, the "negotiation" explanation is itself derived from sex — which the statute expressly disallows. Employers use this excuse constantly; it fails more often than they expect.

No. Labor Code § 1197.5 states that prior salary shall not justify any disparity in compensation, and Labor Code § 432.3 separately bars employers from asking for your salary history at all. An employer may consider an existing employee's current salary in setting pay only if any resulting gap is independently justified by one of the four lawful factors. If your offer was pegged to what you earned at your last job and a coworker's wasn't, that is evidence for you, not for your employer.

The word "system" is doing the work. An employer claiming seniority or merit must show an established, consistently applied structure — written criteria, regular evaluations, documented application — not an after-the-fact rationalization. A "merit system" that produces raises for one group and explanations for another is not a system, and under the statute each factor must be applied reasonably and account for the entire differential it is claimed to explain.

It is the catch-all employers reach for: education, training, experience, certifications, market conditions. But the statute attaches three conditions — the factor must not be based on or derived from a protected-trait differential, must be job-related with respect to the position in question, and must be consistent with business necessity. Even then, you can defeat it by showing an alternative business practice would serve the same business purpose without producing the wage difference. Generic appeals to "the market" rarely survive this test when examined against actual pay data — a dynamic we see constantly in tech compensation cases.

Once you establish a pay differential for substantially similar work, the burden of persuasion shifts to the employer — it must prove its defense, not merely suggest one. This is stronger for workers than the federal framework, where the employer's burden is lighter. Practically, it means the employer's records, policies, and pay decisions go under the microscope, and gaps in its documentation work in your favor — which flows straight into what the claim is worth.

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What Must an Employer Prove to Justify a Pay Gap in California?

The employer must demonstrate that the entire wage differential rests on one or more of four factors: (1) a seniority system, (2) a merit system, (3) a system that measures earnings by quantity or quality of production, or (4) a bona fide factor other than sex, race, or ethnicity — such as education, training, or experience. The fourth factor only applies if the employer proves it is not derived from a sex-, race-, or ethnicity-based differential, is job-related for the position, and is consistent with business necessity. Every factor must be applied reasonably, and together they must account for the whole gap. If any part of the difference is left unexplained — or if you show an alternative business practice would serve the same purpose without the disparity — the defense fails.

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Equal Pay FAQs

Our Most Frequently Asked Questions

We've answered the most common ones below. If yours isn't here, call us — we're available 24/7.

Usually not on its own. Negotiation isn't one of the four lawful factors, and if asking-for-more only works for some groups, the excuse itself becomes evidence of discrimination. Worth a case review.

No — experience can be a lawful factor, but the employer must prove it is job-related, consistent with business necessity, and explains the entire gap. Two years of extra experience rarely explains a $30,000 difference.

California's four factors don't include location as such — unlike Oregon's law, which lists it. A location-based explanation has to survive as a bona fide factor: job-related and consistent with business necessity.

Then the defense fails as to the unexplained part. The statute requires the factors relied upon to account for the entire wage differential.

No. The Equal Pay Act is not about intent — an unjustified gap violates the statute regardless of motive. Intent matters for a separate FEHA discrimination claim, which is often filed alongside.

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