Illegal Interview Questions: 15 Questions Employers Cannot Ask (and What to Ask Instead)

One question cost me a candidate and nearly cost me a lawsuit. During an interview for an operations role at my previous company, I casually asked "Do you have kids? Just wondering about the travel schedule." The candidate paused, answered, and the interview continued normally. She did not get the job (another candidate was stronger on every metric). Two weeks later, I received a letter from an attorney referencing the Pregnancy Discrimination Act.

Nothing came of it legally, but the experience burned a simple lesson into my brain: it does not matter why you ask. It matters what the question reveals. If a question directly or indirectly exposes a protected characteristic (age, race, religion, pregnancy, disability, national origin), it creates legal exposure whether or not the information influenced your decision. For a small business without a legal team to absorb that risk, one careless question can trigger an EEOC investigation that costs more in time and legal fees than the hire itself.

This guide covers the 15 most common illegal interview questions, the federal laws behind each one, a legal alternative for every question, what to do if you accidentally ask one, and how to build an interview process at a small business that keeps you compliant without a dedicated HR department. I built FirstHR to help companies like mine stay compliant from the interview through onboarding, because compliance does not end when the candidate accepts the offer.

What Makes an Interview Question Illegal?

An interview question becomes problematic when it directly or indirectly seeks information about a candidate's protected characteristics. The EEOC does not publish a list of "banned questions." Instead, it prohibits employment decisions based on protected characteristics, and questions that reveal those characteristics create evidence of potential discrimination.

The test is straightforward: does this question reveal information about the candidate's age, race, color, religion, sex, national origin, disability, genetic information, or pregnancy status? If yes, do not ask it. Even if your intent is innocent ("just making conversation"), the question creates a documented connection between protected information and your hiring decision.

The 6 Federal Laws That Govern Interview Questions

Six federal statutes define which characteristics are protected and which employer practices are prohibited. Every small business employer should know these because they determine what you can and cannot ask during any interaction with a candidate, not just the formal interview.

Notice the employee thresholds. Title VII, the PDA, the ADA, and GINA apply to employers with 15 or more employees, and the ADEA applies at 20 or more. The anti-discrimination provision of IRCA, codified at 8 U.S.C. 1324b, exempts any employer with three or fewer employees, so it starts at roughly the fourth hire.

State law is what actually catches small businesses. Most states run their own anti-discrimination laws at lower thresholds: New York, Michigan, and Colorado define employer with no headcount floor at all, so their statutes bite from the first hire, while California covers discrimination at five employees and harassment at any size.

15 Illegal Interview Questions and What to Ask Instead

For each prohibited question below, the "why it is illegal" column identifies the federal law, and the "ask this instead" column provides a legal alternative that gets the job-related information you actually need. If no legal alternative exists, the correct approach is simply not to ask.

The pattern across all 15: the illegal question asks about who the person is (age, family, origin, health). The legal alternative asks about what the person can do (availability, authorization, physical capability). Every legal alternative ties directly to a specific, documented job requirement. If you cannot connect the question to a written job requirement, you should not ask it.

The marital status and children rows come straight from EEOC guidance rather than from anyone's interpretation of it. The Commission states that questions about marital status and the number and ages of children are frequently used to discriminate against women and may violate Title VII if used to deny or limit employment opportunities.

State-Specific Rules: Salary History and Ban-the-Box

Federal law sets the floor. State and local laws often go further. Two areas where state laws most commonly affect interview questions are salary history bans and ban-the-box (criminal history) laws.

Salary History Bans

A long and still-growing list of states bars employers from asking what a candidate currently earns or previously earned. The rationale: anchoring an offer to salary history carries forward pay gaps the new employer had no part in creating.

States with bans include California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Maine, Maryland, Massachusetts, Nevada, New Jersey, New York, Oregon, Rhode Island, Vermont, and Washington. Virginia joined them on July 1, 2026 under Va. Code 40.1-28.7:12, a statute that also requires a pay range in every posting and reaches employers of any size.

Coverage thresholds differ from state to state, so a small employer exempt in one can be covered in the next one over. The safe question everywhere is the forward-looking one: what are your salary expectations for this role? It works in ban states and non-ban states alike, and it gets you the figure you actually need.

Ban-the-Box Laws

Most states, and dozens of cities and counties layered on top of them, restrict when an employer can inquire about criminal history. In many of those states the rule binds public-sector hiring only, so the first thing to check is whether your state reaches private employers at all. Where it does, the ban-the-box design keeps the question off the initial application and unlocks it after a conditional offer. California's Fair Chance Act is the template: it reaches employers with five or more employees and bars any conviction question before that offer.

Once a record does surface, the EEOC's enforcement guidance on arrest and conviction records asks for an individualized assessment built on three factors: the nature and gravity of the offense, the time that has passed since the offense or the completion of the sentence, and the nature of the job held or sought.

An arrest by itself proves nothing, and the same guidance says so directly: the fact of an arrest does not establish that criminal conduct has occurred, so an exclusion based on the arrest alone is not job related and consistent with business necessity. A blanket rule against anyone with a record can violate Title VII through disparate impact even where no discriminatory intent exists.

Check your specific state before your next interview.

ADA and Pre-Employment Medical Questions

The ADA creates a specific three-stage framework for medical questions that trips up small business employers more than any other area.

The critical distinction sits at the conditional offer. Before it, you cannot ask about disabilities at all. After it, but before the person starts work, you can condition the job on a medical exam, and the EEOC pre-employment inquiries guidance allows it only if all new employees in the same job have to take it.

Interviewing a candidate who has a visible disability trips up managers who mean well. The DOL guidance on interviewing applicants with disabilities is blunt about the fix: make the interview location and process accessible, be ready to provide a reasonable accommodation for the interview itself, and concentrate on the individual rather than the disability.

What to Do If You Accidentally Ask an Illegal Question

It happens. Mid-conversation, you ask something you should not have. The candidate answers before you realize the mistake. What you do next matters far more than the question itself.

The most important step is documentation. An EEOC investigation months later will ask what happened during the interview. If you documented the mistake, the redirect, and the fact that the information was not considered in your hiring decision, you have a defensible position. If you have no documentation, the candidate's version of events is the only record.

Writing it down the same day is what makes it a contemporaneous record rather than a reconstruction weeks later. This is the form for that, and the field that carries the most weight is the first one: the question exactly as it was asked.

Building a Compliant Interview Process (Without an HR Team)

A compliant interview process is not about memorizing a list of prohibited questions. It is about building a system that prevents the wrong questions from being asked in the first place. For a small business without an HR department, this system is 4 steps.

Step 3 is the one with hard research behind it. The Office of Personnel Management's practical guide to structured interviews states that research consistently indicates unstructured interviews have little value in predicting job performance, while structured interviews have demonstrated a high degree of reliability, validity, and legal defensibility.

The Worst Interview Questions (Beyond Illegal)

Illegal questions are the worst interview questions in the legal sense: they create real liability. But there is a second category of bad question that never shows up in a lawsuit and quietly wastes every interview it appears in. These questions are perfectly legal and perfectly useless: they produce rehearsed answers, waste scarce time, or reveal nothing about whether the candidate can do the job. When people search for the worst interview questions, they usually mean both kinds, so it is worth covering the ineffective ones alongside the illegal ones.

The common thread among weak-but-legal questions is that they invite performance rather than evidence. A strong question forces the candidate to describe something they actually did; a weak question lets them recite something they rehearsed. The seven below are the most common offenders, each paired with a better alternative that gets you real signal.

The fix for every one of these follows the same pattern that fixes illegal questions: replace a vague or self-report question with a behavioral one that asks for a specific past example. Instead of asking who the person is or what they would ideally do, ask what they actually did in a real situation. That single shift, from hypothetical and self-assessment toward concrete behavior, eliminates most weak questions at once.

From Compliant Interview to Compliant Onboarding

Compliance does not end when the candidate accepts the offer. In fact, several compliance-critical actions happen in the first three business days after the hire starts, and missing them creates the same legal exposure as asking an illegal interview question.

The connection between interview compliance and onboarding compliance is direct. The same employer who asks "Where are you from?" during the interview is likely the same employer who forgets the I-9 deadline after the hire starts. Both failures come from the same root cause: no structured process.

FirstHR handles the post-offer compliance workflow: e-signature for offer letters and I-9 forms, automated task workflows that ensure every compliance step happens on schedule, document management for signed forms, and training module assignment for required harassment prevention courses.

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