An employer can legally refuse to hire an applicant for almost any reason, as long as it isn’t based on a characteristic protected by federal, state, or local anti-discrimination law. That covers a wide range of everyday grounds: weak qualifications, poor interview performance, failed background or drug screenings, lies on a resume, inability to do the essential parts of the job, salary expectations that overshoot the budget, or a hiring freeze that eliminates the role. The at-will employment principle gives businesses broad discretion in choosing whom to bring on. The boundary is the point where the real reason for the rejection is race, sex, age, disability, religion, national origin, or another protected trait, dressed up as something else.
Qualifications, Interviews, and Being “Overqualified”
The most common reason someone doesn’t get the job is that someone else was a better match. If a posting requires a specific degree, a number of years in the field, or proficiency with certain tools, the employer can pass on anyone who falls short. Licensing and certification requirements work the same way. A hospital doesn’t need to justify turning away a nurse whose license has lapsed.
Interview performance counts too, even though the assessment is subjective. An employer can prefer the candidate who communicated more clearly, showed a deeper grasp of the role, or came across as more motivated. These judgment calls are legal so long as they aren’t a cover for something else. Vague labels like “not a good communicator” become a problem when they’re applied inconsistently across candidates of different backgrounds. That pattern starts to look like pretext.
Rejecting someone as overqualified is permissible but carries its own risk. Turning away a candidate whose experience far exceeds the role because you expect rapid turnover is a legitimate business concern. The problem is that “overqualified” can function as a stand-in for “too old,” which triggers age discrimination liability under federal law. Objective, measurable reasons hold up: passing on all graduate-degree candidates for an entry-level job is defensible. Passing on someone because you assume they won’t stay engaged is subjective enough to invite scrutiny.
Failed Pre-Employment Screenings
Background checks, drug tests, and other screens regularly disqualify candidates. How the screening is conducted matters as much as the result.
Criminal Background Checks
A criminal record can be a legitimate basis for rejection when the conviction is relevant to the job. A fraud conviction matters for someone handling money; a reckless driving conviction matters for a delivery driver. The connection between the offense and the role is what makes the decision defensible.
The Fair Credit Reporting Act governs how employers use third-party background reports. Before ordering a report, the employer needs the applicant’s written permission. If something in the report may cost the applicant the job, the employer has to send a copy of the report and allow time to dispute any errors before making a final decision. Only after that waiting period can the employer send formal notice that the decision is final.1Federal Trade Commission. Background Checks on Prospective Employees: Keep Required Disclosures Simple Skipping any step in that process creates liability for the employer.
Timing restrictions also apply in some contexts. Federal agencies and their contractors cannot ask about criminal history until after a conditional offer, under the Fair Chance to Compete for Jobs Act.2eCFR. Part 920 Timing of Criminal History Inquiries Roughly a third of states have similar “ban-the-box” laws covering private employers, pushing criminal history questions later in the process.
Drug Tests
A positive drug test for illegal substances is a clean reason to withdraw an offer, and most states allow employers to maintain drug-free workplace policies. Marijuana is the moving piece. A growing number of states restrict pre-employment marijuana testing for non-safety-sensitive positions, so what the employer can do depends heavily on where the job is located.
Credit Checks
For positions that involve financial responsibility, such as handling cash, accessing accounts, or managing budgets, an employer may pull a credit report. The same FCRA procedures apply: written consent, a copy of the report and a chance to respond before any adverse decision, and a final notice if the employer moves forward with a rejection.3Federal Trade Commission. What Employment Background Screening Companies Need to Know About the Fair Credit Reporting Act Several states restrict or ban the use of credit reports in hiring for most positions.
Social Media Reviews
Checking a candidate’s public social media is legal but risky, because it almost inevitably exposes the reviewer to information about protected characteristics like religion, pregnancy, disability, or political activity. If an employer rejects a candidate shortly after viewing a profile that reveals any of these, the timing alone can create an inference of discrimination. The EEOC treats social media screening like any other background check: standards must be applied to every candidate, and any exclusionary criteria must be job-related and consistent with business necessity.4U.S. Equal Employment Opportunity Commission. Background Checks: What Employers Need to Know If a third-party company runs the review, FCRA rules also apply.
Dishonesty on the Application
Discovering that an applicant lied on a resume or application is one of the cleanest legal reasons to refuse a hire. Inflated titles, fabricated degrees, and covered-up employment gaps all qualify. The dishonesty itself is the disqualifier. The employer does not have to prove the lie would have affected job performance.
Lack of Work Authorization
Federal law requires every employer to verify that a new hire is authorized to work in the United States, using Form I-9. The employee fills out their section no later than their first day of work and must present original identity and employment authorization documents within three business days.5U.S. Citizenship and Immigration Services. Instructions for Form I-9, Employment Eligibility Verification If acceptable documents don’t appear within that window, the employer cannot legally keep the person on.
One important limit: the employee chooses which documents to present from the government’s approved list. An employer cannot demand a specific document, such as insisting on a green card when a driver’s license and Social Security card would suffice. Requiring more or different documents than the law calls for is “document abuse” and can violate federal anti-discrimination law if it targets people based on national origin or citizenship status.6Office of the Law Revision Counsel. 8 USC 1324b – Unfair Immigration-Related Employment Practices
Inability to Perform Essential Job Functions
An employer can decline to hire someone who cannot carry out the core duties of the position. These are the tasks that define why the job exists: lifting heavy freight in a warehouse role, driving for a delivery job, standing for extended periods in a surgical suite. If an applicant cannot do these things, with or without help, the employer has grounds to choose someone else.
The Americans with Disabilities Act adds a layer for employers with 15 or more workers. Before rejecting a candidate with a disability, the employer must consider whether a reasonable accommodation would allow the person to do the job. That might mean modified equipment, a flexible schedule, or reassigning marginal tasks. The employer is only off the hook if no workable accommodation exists or if the accommodation would impose an undue hardship, meaning significant difficulty or expense given the size and resources of the business.7U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Reasonable Accommodation and Undue Hardship Under the ADA
Timing matters too. An employer cannot ask disability-related questions or require a medical exam before extending a conditional offer.8U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Disability Related Inquiries and Medical Examinations of Employees Under the ADA After a conditional offer, exams are permitted, but they must be required of everyone entering the same job category, not just the candidate the employer suspects has a disability.9U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Disability-Related Inquiries and Medical Examinations of Employees Under the ADA Selectively requiring exams is a fast path to a discrimination claim.
Religious Practice Conflicts
Title VII of the Civil Rights Act requires employers to accommodate a sincerely held religious practice unless doing so would create an undue hardship. This comes up most often with scheduling. A candidate who observes a Saturday Sabbath applies for a role with Saturday shifts, for example.
For decades, courts treated even minor costs as enough to deny an accommodation. That changed in 2023. In Groff v. DeJoy, the Supreme Court held that an employer must show the accommodation would impose a substantial burden in the overall context of its business, not merely any cost above zero.10Supreme Court of the United States. Groff v. DeJoy (Opinion) The Court also held that coworker resentment about picking up extra shifts doesn’t count as a hardship, and that the employer must explore alternatives like voluntary shift swaps before concluding accommodation is impossible.
An employer can still reject a candidate when a genuine accommodation analysis shows no workable path. The bar for proving that is higher than it used to be, and pointing to the inconvenience of rearranging a schedule won’t clear it.
Screening Methods That Aren’t Allowed
Even when the underlying reason for a rejection is valid, using a prohibited screening method to reach it can make the whole decision illegal.
Lie Detector Tests
The Employee Polygraph Protection Act prohibits most private employers from requiring or even suggesting that a job applicant take a lie detector test. An employer also cannot refuse to hire someone who declines to take one, or base a hiring decision on the results of a test the applicant did take.11Office of the Law Revision Counsel. 29 USC Chapter 22 – Employee Polygraph Protection Narrow exceptions exist for a handful of industries; outside those, polygraph results are off the table as a hiring tool.
AI and Algorithmic Screening
Automated resume screeners, AI-scored video interviews, and algorithmic ranking tools are increasingly common, and federal anti-discrimination law applies to them with full force. If a neutral-looking algorithm disproportionately screens out applicants of a particular race, sex, age, or disability status, the employer faces the same disparate-impact liability as if a human recruiter had done the filtering. The EEOC has specifically flagged examples like video-interview software that penalizes speech patterns related to a disability.12U.S. Equal Employment Opportunity Commission. What Is the EEOC’s Role in AI Employers relying on these tools without auditing them for bias take on serious legal risk.
Other Legitimate Business Reasons
Plenty of practical, non-discriminatory reasons justify not hiring someone. Salary expectations that exceed the budget are a straightforward mismatch. If the company freezes hiring, restructures a department, or eliminates the role between the posting and the offer, no one has a legal claim to a job that no longer exists.
Conflict-of-interest concerns are also valid. An employer can decline to hire someone who currently works for a direct competitor and may be bound by a non-compete, or someone whose outside business interests could interfere with their duties. Anti-nepotism policies, which refuse to hire close relatives of current employees (particularly where one would supervise the other), are common in both the public and private sectors and are generally lawful.
“Cultural fit” deserves a note of caution. The concept is legitimate when it describes whether someone’s work style and communication preferences align with a team’s established practices. It becomes dangerous when it functions as a gut feeling that happens to correlate with age, ethnicity, or another protected trait. Employers who lean on cultural fit should be able to articulate what specific, job-related traits they are evaluating.
What an Employer Cannot Consider
Every legal reason above operates within a boundary drawn by federal anti-discrimination statutes. Crossing it turns a permissible business decision into an illegal employment practice. The core federal protections cover:
- Race, color, religion, sex, and national origin, under Title VII of the Civil Rights Act of 1964. “Sex” includes pregnancy, childbirth, and related medical conditions.13U.S. Equal Employment Opportunity Commission. Title VII of the Civil Rights Act of 1964
- Age 40 and older, under the Age Discrimination in Employment Act.
- Disability, under the ADA, which prohibits refusing to hire a qualified individual who can perform essential job functions with or without reasonable accommodation.14U.S. Equal Employment Opportunity Commission. The ADA: Your Responsibilities as an Employer
- Genetic information, under the Genetic Information Nondiscrimination Act, which makes it illegal to use genetic test results or family medical history in hiring.15U.S. Department of Labor. The Genetic Information Nondiscrimination Act of 2008: GINA
Many state and local laws go further, adding protections for sexual orientation, gender identity, marital status, arrest records, or credit history. A hiring decision may be perfectly legal under federal law and still violate a state or local ordinance.
In practice, the critical distinction is between a reason and a pretext. Employers are free to reject applicants for legitimate business reasons: lack of qualifications, failed screenings, budget constraints, poor references. If the real motivation is a protected characteristic and the stated reason is a cover story, courts will look past the label. Documentation, consistency, and applying the same standards to every candidate are what separate a defensible decision from a discrimination claim.