When Seniority Systems Lead to Unequal Pay: NJ Legal Insight

Seniority systems are common in many workplaces. They’re often used to decide pay increases, promotions, job assignments, and even layoffs. On paper, seniority pay in NJ is supposed to be fair: rewarding employees for their loyalty and years of service.

But what happens when a seniority system ends up creating or perpetuating pay gaps, especially for women, employees of color, or other protected groups? In New Jersey, the law says that employers cannot hide behind “tradition” or “company policy” if the outcome is illegal wage discrimination.

Let’s look at how seniority systems work, when they cross the line into unlawful territory, and when you should consider consulting an equal pay act lawyer in New Jersey.

How Seniority Systems Work in the Workplace

A seniority system is a method for determining pay, job assignments, promotions, and other benefits based on how long an employee has worked for the employer. These systems are common in unionized workplaces but also appear in non-union settings, particularly in industries with structured job levels, such as manufacturing, transportation, and education.

They often affect:

• Pay scales — Employees with more years at the company earn higher hourly rates or salaries.
• Promotions — Advancement opportunities are given to those with the most years in service.
• Layoffs — “Last in, first out” rules prioritize keeping senior employees during downsizing.
• Shift preferences — More senior employees get first choice of desirable shifts.

While these policies are not inherently illegal, problems arise when they lock in the effects of past discrimination or are applied inconsistently.

Where Seniority and Pay Inequality Collide

The biggest issue is that a seniority system, if left unchecked, can perpetuate pay disparities that began with discriminatory practices years or even decades earlier.

For example:

• Past hiring discrimination — If women or people of color were historically hired into lower-paying positions or hired later than white male colleagues, they will have less seniority overall.
• Career interruptions due to discrimination — Employees who took protected leave (such as for pregnancy or disability) might be passed over for seniority credit, affecting their long-term pay.
• Job segregation — Seniority tied to job classification can keep historically marginalized groups in lower-paying “tracks,” even if they’ve worked at the company for many years.

Over time, these patterns can make it appear as though pay gaps are the result of “neutral” seniority rules — when in fact, they’re a continuation of earlier discrimination and violations of seniority pay laws in New Jersey.

What New Jersey Law Says About Equal Pay and Seniority

In 2018, the pay gap in New Jersey remained a significant issue, revealing how different biases can impact earnings in measurable ways:

• White women earned about 81 cents for every dollar paid to white men.
• Black women earned roughly 80 cents for every dollar earned by white women.
• Latina women earned only 62 cents for every dollar paid to white men.

This is the reason why New Jersey passed the Diane B. Allen Equal Pay Act back in 2018: one of the strongest equal pay laws in the country, which amended the New Jersey Law Against Discrimination (NJLAD).

Under this law, employers cannot pay an employee less than others doing “substantially similar work” based on gender, race, or other protected characteristics — and that includes situations where gender and race intersectionality results in compounded pay disparities. A seniority system can be a lawful reason for pay differences, but only if:

• It is applied consistently to all employees.
• It does not have its roots in discrimination.
• It does not perpetuate existing discriminatory disparities.

If a seniority system is found to be tainted by bias, inconsistently applied, or to disproportionately harm employees who face overlapping discrimination based on both race and gender, it cannot be used as a defense for unequal pay in New Jersey.

Spotting the Warning Signs of a Problematic Seniority System

Here are some red flags that could mean a seniority system is contributing to illegal pay disparities — and may be one of the top excuses employers use to justify unequal pay:

• Lack of written rules — If the seniority policy is unwritten or inconsistently applied, it’s more susceptible to bias.
• Differences by department — A system that applies differently to male-dominated vs. female-dominated departments could be discriminatory.
• Impact on certain groups — If women, racial minorities, or older workers are disproportionately at the bottom of the seniority ladder, it may reflect past discriminatory hiring or promotion practices.
• Seniority credit exclusions — Employees may lose seniority credit for taking protected leave, such as for pregnancy or medical conditions, which can violate state law.

If you notice these patterns, it’s worth looking closer at whether the system is truly fair — or legally compliant.

Examples of Potential Seniority Pay Violations in NJ

To put this into context, here are some scenarios where seniority-based pay differences could run afoul of New Jersey law:

• Scenario 1: A company historically hired women into clerical roles and men into production roles. The production roles pay more and have clearer promotion paths. Even after integrating the workforce, women remain in lower-paying roles with less seniority, reinforcing the pay gap.
• Scenario 2: An employee takes maternity leave. Upon return, the company reduces her seniority credit, placing her behind male colleagues who took no leave. She is passed over for promotion based on her “reduced” seniority.

In each case, the system may look neutral on paper but results in protected groups being paid less for similar work — a problem that pay transparency laws aim to expose and prevent by making compensation practices more open and accountable.

Legal Protections Under NJLAD and the Equal Pay Act

The New Jersey Law Against Discrimination prohibits discrimination in pay and other terms of employment based on protected characteristics such as gender, race, age, disability, and more.

The Diane B. Allen Equal Pay Act expands this by:

• Requiring equal pay for “substantially similar work” — not just identical jobs.
• Allowing employees to discuss salaries with co-workers and compare pay across different locations and job titles.
• Placing the burden on employers to prove that any pay disparity is based on legitimate, non-discriminatory factors.
• Extending the statute of limitations for unequal pay claims to six years.

Importantly, if a seniority system fails to meet the standards of fairness and consistency under the law, it cannot be used as a valid reason for pay differences.

How to Protect Your Rights Against Unequal Seniority Pay

If you suspect that a seniority system is causing or contributing to unequal pay, here are steps you can take:

1. Gather Your Pay Information

To spot pay discrimination when job titles are the same, keep a detailed record of your pay rate, raises, bonuses, and any explanations your employer provides for them. Compare your compensation to that of coworkers performing substantially similar work to see if disparities exist.

2. Review the Seniority Policy

Ask for a copy of the written seniority policy. Check how it’s applied in practice — is it consistent? Are exceptions made?

3. Look at the Big Picture

If employees from certain protected groups consistently have less seniority and therefore lower pay, this could be a red flag.

4. Speak to HR or a Supervisor

Raise your concerns internally first, unless you believe doing so would lead to retaliation. Keep records of all communications.

5. File a Complaint with the State

You can file a complaint with the New Jersey Division on Civil Rights (DCR) or the U.S. Equal Employment Opportunity Commission (EEOC). Both agencies investigate discrimination claims.

6. Consult an Employment Lawyer

An experienced equal pay act attorney in New Jersey can help you determine whether your employer’s seniority system is legal and whether you may have a claim for unequal pay.

Final Thoughts

Seniority systems can be a fair way to reward long-term employees — but only if they’re applied consistently and without bias. In New Jersey, strong equal pay laws mean that employers cannot hide behind seniority rules to justify unlawful pay disparities.

If you suspect your employer’s seniority system is unfair, don’t ignore it. By understanding your rights, gathering evidence, and taking legal action when necessary, you can help ensure a truly fair workplace.

Contact Us for Legal Advice and a Free Consultation

If you believe your pay is being affected by a discriminatory seniority system, our New Jersey employment law team is here to help. 

We have experience uncovering hidden pay disparities and holding employers accountable under the Diane B. Allen Equal Pay Act and NJLAD. 

Contact us today to schedule your free consultation and discuss your legal options.