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Anti-Discrimination Laws for Employers: Complete Guide

Last updated: 2026-03-27

Summary:Federal law prohibits employment discrimination based on race, color, religion, sex (including pregnancy, sexual orientation, and gender identity), national origin, age (40+), disability, and genetic information. The key laws are Title VII (15+ employees), ADA (15+), ADEA (20+), EPA (all), and GINA (15+). Most states expand protections to cover smaller employers and additional classes. Discrimination law affects every employment decision — hiring, firing, pay, promotions, and working conditions. Employers must provide reasonable accommodations under ADA, prevent workplace harassment, and follow the EEOC complaint process when charges are filed.

What federal anti-discrimination laws apply to employers?

The following federal laws form the foundation of workplace anti-discrimination protections. Each has specific employer size thresholds and covers specific protected classes.

LawYearProtected ClassesEmployer SizeEnforcer
Title VII of the Civil Rights Act1964Race, color, religion, sex (includes pregnancy, sexual orientation, gender identity per Bostock 2020), national origin15+ employeesEEOC
Americans with Disabilities Act (ADA)1990Physical or mental disability (qualified individuals)15+ employeesEEOC
Age Discrimination in Employment Act (ADEA)1967Age (40 and older)20+ employeesEEOC
Equal Pay Act (EPA)1963Sex (equal pay for equal work)All employersEEOC
Genetic Information Nondiscrimination Act (GINA)2008Genetic information, family medical history15+ employeesEEOC
Pregnancy Discrimination Act (PDA)1978Pregnancy, childbirth, related medical conditions15+ employeesEEOC
Pregnant Workers Fairness Act (PWFA)2023Known limitations related to pregnancy, childbirth, related conditions15+ employeesEEOC
USERRA1994Military service, veteran statusAll employersDOL / DOJ

Employee count includes full-time, part-time, and temporary workers employed during 20 or more calendar weeks in the current or preceding year.

How do state anti-discrimination laws go further?

Nearly every state has its own anti-discrimination law that supplements federal protections. State laws commonly expand coverage in three ways:

Smaller employer thresholds

While federal Title VII requires 15+ employees, many states cover smaller businesses. Examples: California (5+), Colorado (1+), Connecticut (3+), the District of Columbia (1+), Hawaii (1+), Maine (1+), Massachusetts (6+), Minnesota (1+), Montana (1+), New Jersey (1+), New York (4+), Oregon (1+), Vermont (1+), Washington (8+), and Wisconsin (1+). Even if you have just one or two employees, your state likely covers you.

Additional protected classes

Common state-level protections beyond federal law include:

  • Sexual orientation & gender identity: Explicitly protected in 20+ states (also covered federally after Bostock v. Clayton County, 2020)
  • Marital status: Protected in about 20 states
  • Lawful off-duty conduct: Several states protect employees from being fired for legal activities outside work (smoking, recreational cannabis in legal states)
  • Political affiliation: Protected in DC, California, New York, and a few other states
  • Credit history: About 11 states restrict use of credit information in employment decisions
  • Criminal history (ban the box): 35+ states limit when criminal background can be inquired about
  • Salary history: 20+ states and many cities prohibit asking about prior salary
  • Domestic violence victim status: Protected in several states including New York, Illinois, and Oregon

Stronger remedies

Some states allow larger damage awards than federal law, provide longer statutes of limitations for filing claims, or give state agencies more enforcement power. California and New York, for instance, have no cap on compensatory or punitive damages for discrimination claims, while federal Title VII caps damages based on employer size (ranging from $50,000 for employers with 15-100 employees to $300,000 for 500+ employees).

What can and cannot you ask in job interviews?

The hiring process is where many discrimination claims originate. Every question you ask in an interview, on an application, or during screening should be directly related to the job requirements. Here are the guidelines:

Safe to ask

  • Are you authorized to work in the United States?
  • Can you perform the essential functions of this job with or without reasonable accommodation?
  • Are you available to work the schedule required for this position?
  • Do you have any certifications or licenses required for this role?
  • What are your salary expectations?
  • Why are you interested in this position?
  • Tell me about your relevant experience.
  • Are you willing to travel as required by this role?

Do not ask

  • How old are you? / When did you graduate?
  • Are you married? Do you have children? Are you planning to have children?
  • What country are you from? / What is your native language?
  • What religion do you practice? / Do you observe any religious holidays?
  • Do you have any disabilities or health conditions?
  • Have you ever filed a workers' comp claim?
  • What is your sexual orientation / gender identity?
  • Have you ever been arrested? (in most states; conviction inquiries may be OK in some)
  • How much did you make at your last job? (banned in many states/cities)

The general rule: if the question is not directly related to the person's ability to perform the specific job, do not ask it. Even well-meaning "small talk" questions ("Where are you originally from?" or "Do you have kids?") can become evidence of discriminatory intent if the candidate is not hired.

How does reasonable accommodation work under the ADA?

The ADA requires employers with 15+ employees to provide reasonable accommodations to qualified individuals with disabilities, unless doing so would create an "undue hardship." The process works through an interactive dialogue between the employer and employee.

The interactive process

  • Employee requests accommodation(does not need to use the word "accommodation" or cite the ADA — any statement that they need a change due to a medical condition triggers the process)
  • Employer engages in dialogue to understand the limitation and identify possible accommodations
  • Employer may request medical documentation to verify the disability and understand functional limitations
  • Employer selects an effective accommodation (does not have to be the one the employee requests, but must be effective)

Common accommodations

  • Modified work schedule or flexible hours
  • Ergonomic furniture, standing desks, or assistive technology
  • Remote work or telework arrangements
  • Reassignment to a vacant position
  • Leave of absence for treatment
  • Modification of workplace policies (e.g., allowing a service animal)
  • Providing sign language interpreters or screen readers

Undue hardship defense

An employer can deny an accommodation if it would cause "undue hardship" — significant difficulty or expense considering the employer's size, financial resources, and the nature of the business. This is a high standard. Courts and the EEOC consider the overall resources of the business, not just one location. The fact that an accommodation costs money is generally not enough — the cost must be genuinely significant relative to the business.

What are the harassment prevention requirements?

Workplace harassment based on any protected characteristic is a form of discrimination. Employers have both a legal and practical obligation to prevent and address it.

Two types of illegal harassment

  • Quid pro quo: When a supervisor conditions an employment benefit (hiring, promotion, continued employment) on the employee submitting to unwelcome conduct (typically sexual). A single incident can constitute quid pro quo harassment.
  • Hostile work environment: When unwelcome conduct based on a protected class is so severe or pervasive that it creates an intimidating, hostile, or offensive work environment. This can include jokes, slurs, physical conduct, offensive images, or any conduct that unreasonably interferes with work performance.

Employer best practices

  • Written anti-harassment policy: Clearly define prohibited conduct, provide multiple channels for reporting (so victims do not have to report to their harasser), prohibit retaliation, and describe the investigation process.
  • Regular training: California requires 2 hours for supervisors and 1 hour for employees every 2 years (companies with 5+ employees). New York requires annual training for all employees. Illinois requires annual training. Even in states without a mandate, training is critical.
  • Prompt investigation: When a complaint is received, investigate promptly, thoroughly, and impartially. Document every step. Take appropriate corrective action if harassment is found.
  • No retaliation: Employees who report harassment or participate in investigations must be protected from retaliation. Retaliation claims are now the most commonly filed charge with the EEOC.

What is the EEOC complaint process?

When an employee believes they have been discriminated against, they can file a "charge of discrimination" with the EEOC. Here is what happens from the employer's perspective:

1. Charge filed

The employee files a charge with the EEOC (must be done within 180 days of the alleged discrimination, or 300 days in states with a state anti-discrimination agency). The EEOC notifies you within 10 days.

2. Mediation offered

The EEOC may offer voluntary mediation as a free, confidential alternative to investigation. Mediation resolves about 70% of cases where both parties participate and is often the fastest, cheapest resolution.

3. Investigation

If mediation is declined or fails, the EEOC investigates. You will be asked to submit a position statement responding to the allegations. The EEOC may request documents, interview witnesses, and visit your workplace. Cooperate fully — obstruction can result in an adverse inference.

4. Determination

The EEOC issues a determination of either "reasonable cause" (finding discrimination likely occurred) or "no reasonable cause" (dismissing the charge). If reasonable cause is found, the EEOC attempts conciliation. If conciliation fails, the EEOC may file a lawsuit against you or issue a "right to sue" letter to the employee.

5. Resolution

Cases are resolved through mediation, settlement, conciliation, EEOC litigation, or private lawsuit. Remedies can include back pay, reinstatement, compensatory and punitive damages, attorney fees, and injunctive relief (required policy changes, training, monitoring).

Frequently asked questions

Do anti-discrimination laws apply to small businesses?

It depends on the specific law. Federal Title VII, ADA, and GINA apply to employers with 15 or more employees. The ADEA applies at 20+ employees. The Equal Pay Act applies to all employers. However, many states have their own anti-discrimination laws that cover smaller employers — some states cover employers with as few as 1 employee. Even if you are below the federal threshold, you are almost certainly covered by your state's anti-discrimination law.

What is the difference between disparate treatment and disparate impact?

Disparate treatment is intentional discrimination — treating someone differently because of their protected class (e.g., refusing to hire women for a role). Disparate impact is unintentional discrimination — a neutral policy that disproportionately affects a protected group (e.g., a height requirement that screens out most women and many people of certain ethnicities). Both are illegal. Disparate impact claims can be defended if the employer can show the policy is job-related and consistent with business necessity.

What is a 'reasonable accommodation' under the ADA?

A reasonable accommodation is a modification or adjustment to a job, work environment, or process that enables a qualified individual with a disability to perform the essential functions of the job. Examples include modified work schedules, ergonomic equipment, accessible parking, reassignment to a vacant position, job restructuring, or providing a sign language interpreter. The accommodation must not impose an 'undue hardship' on the employer — meaning significant difficulty or expense relative to the employer's resources.

Am I required to have an anti-harassment policy?

While not all states explicitly require a written anti-harassment policy, having one is strongly recommended by the EEOC and is effectively necessary to establish an 'affirmative defense' against harassment claims. Several states (California, Connecticut, Delaware, Illinois, Maine, New York) require employers to conduct anti-harassment training. California requires harassment prevention training for all employees in companies with 5+ workers every two years.

What happens when an employee files an EEOC charge against my business?

The EEOC will notify you of the charge and may request your position statement. The agency will investigate, which may include document requests, interviews, and an on-site visit. The EEOC will attempt mediation if both parties agree. If the investigation finds reasonable cause, the EEOC will try to negotiate a settlement (conciliation). If conciliation fails, the EEOC may file a lawsuit or issue a 'right to sue' letter allowing the employee to sue you directly. The entire process can take 6 months to several years.

Can I ask about criminal history during the hiring process?

This depends on your state and city. Over 35 states and 150+ cities have adopted 'ban the box' laws that restrict when employers can inquire about criminal history. Generally, these laws delay criminal history inquiries until after a conditional offer has been made. The EEOC also advises that blanket policies excluding anyone with a criminal record may have a disparate impact on certain racial and ethnic groups. Best practice: evaluate criminal history on a case-by-case basis, considering the nature of the offense, time elapsed, and relevance to the job.

What states have expanded protections beyond federal anti-discrimination laws?

Most states go beyond federal law in some way. Common expansions include: covering smaller employers (many states cover employers with 1-6 employees), protecting additional classes such as sexual orientation and gender identity (now effectively covered federally after Bostock but with explicit state protections too), marital status, political affiliation, source of income, credit history, and domestic violence victim status. States like California, New York, New Jersey, Illinois, and Washington have among the broadest state protections.

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This is general information, not legal advice. Anti-discrimination laws are complex and vary by state. Consult a qualified employment attorney for advice specific to your business. Sources: EEOC, U.S. Department of Labor, ADA National Network, Job Accommodation Network, NCSL, individual state civil rights agency websites.