Yes, in most U.S. jobs you can fire an employee during a probationary period or the first 90 days, but that window gives you no special license to fire someone for an illegal reason. The default rule across the country is at-will employment, which means either side can end the relationship at any time, for any reason or no reason, as long as the reason is not unlawful. The catch is that the same federal and state protections that apply to a 20-year veteran also apply to a brand-new hire on day one. "Probation" is a management label, not a legal shield.
What a "Probation Period" Actually Means (and Doesn't)
A 30, 60, or 90-day probationary or introductory period is an internal HR concept, not a legal status created by federal law. Employers use it to set expectations, structure onboarding, and signal that the first few months are a trial. It is a useful tool. But labeling a period "probation" does not lower the legal bar for firing, and calling it "probation" does not, by itself, change someone's at-will status in either direction.
Two common misconceptions are worth clearing up:
- "They can't sue us during probation." Not true. A new hire can file a discrimination or retaliation charge based on conduct that happened in week one.
- "Probation means we can fire for absolutely anything." Also not true. The reason still cannot be an illegal one, and you cannot retaliate for protected activity.
One nuance: in some workplaces, a written probationary period can actually create obligations. If your handbook, offer letter, or a union contract promises a specific review process or says employees become "permanent" only after passing probation, a court or arbitrator may treat that language as a promise. Read your own documents before you rely on "probation" as a free pass.
The Federal Baseline: Protections That Apply From Day One
Several federal laws make certain firing reasons illegal regardless of tenure. These apply to new hires immediately, with the main caveat being employer size and, for a few laws, hours or service thresholds.
- Title VII of the Civil Rights Act of 1964 bars firing because of race, color, religion, sex (including pregnancy, sexual orientation, and gender identity), or national origin. Enforced by the Equal Employment Opportunity Commission (EEOC). Generally applies to employers with 15 or more employees.
- Americans with Disabilities Act (ADA) bars firing because of a disability and requires reasonable accommodation. Also EEOC-enforced; generally 15+ employees.
- Age Discrimination in Employment Act (ADEA) protects workers age 40 and over. EEOC-enforced; generally 20+ employees.
- Equal Pay Act bars sex-based pay discrimination for equal work. EEOC-enforced.
- National Labor Relations Act (NLRA) protects "concerted activity" - employees acting together about wages, safety, or working conditions, union or not. Enforced by the National Labor Relations Board (NLRB). This protects new hires too.
- Occupational Safety and Health Act (OSHA) bars retaliation against an employee for raising a safety concern. Enforced by OSHA within the U.S. Department of Labor.
- Fair Labor Standards Act (FLSA) protects an employee who complains about unpaid minimum wage or overtime, enforced by the U.S. Department of Labor, Wage and Hour Division.
The Family and Medical Leave Act (FMLA) is the main exception to "protected from day one." FMLA eligibility generally requires about 12 months of service and 1,250 hours worked, so most employees in their first 90 days are not yet FMLA-eligible. That does not mean you can fire someone for being sick or pregnant - the ADA and Title VII (including its pregnancy protections) may still apply even when FMLA does not.
Reasons You Cannot Fire a New Hire
Regardless of probation, you generally cannot fire someone because of:
- A protected characteristic - race, color, religion, sex, pregnancy, national origin, disability, age 40+, and, under many state laws, additional categories like marital status, sexual orientation, gender identity, or military status.
- Retaliation for protected activity - reporting harassment or discrimination, filing a workers' compensation claim, raising a safety issue, complaining about unpaid wages, participating in an investigation, or discussing pay with coworkers.
- Requesting an accommodation for a disability or a sincerely held religious practice.
- Jury duty, voting leave, or military service, which are protected by federal and many state laws.
- Refusing to do something illegal, which many states protect under "public policy" exceptions to at-will employment.
The danger with probationary firings is timing. If you terminate a new hire days after they request a pregnancy accommodation, report a safety hazard, or complain about a paycheck, the close timing alone can support a retaliation claim - even if your real reason was performance. The law lets a worker point to suspicious timing as evidence.
Where State Law Adds Stronger Protections
Federal law is the floor, not the ceiling. State and local law commonly go further, and this varies significantly by state:
- Lower employer-size thresholds. Some states apply anti-discrimination law to employers with as few as one employee, so the 15-employee Title VII cutoff may not protect you.
- More protected classes. Many states protect categories federal law does not.
- Final-pay timing. A number of states require that a terminated worker's final paycheck be delivered within a specific, short window - sometimes the same day. The exact rule varies by state, so check your state labor department.
- Stronger whistleblower and public-policy protections.
- A few jurisdictions limit pure at-will firing or imply a duty of good faith.
Montana is the well-known outlier: after a probationary period it limits at-will firing and generally requires good cause. That is the exception, not the rule, but it shows why your state matters.
Practical Steps for Employers
If you are letting a new hire go, a clean, documented process protects you:
- Write down the real, lawful reason before the meeting - specific performance gaps, missed deadlines, policy violations, attendance, or fit issues with concrete examples and dates.
- Be consistent. Apply the same probationary standard to everyone. Firing one new hire for tardiness while keeping another who is similarly late invites a discrimination claim.
- Check for recent protected activity. Did this person recently request leave, an accommodation, report a concern, or complain about pay? If so, pause and confirm your reason is independent and well-documented.
- Keep the documentation in the personnel file - reviews, warnings, emails, and the termination decision.
- Handle final pay correctly under your state's deadline, and process any earned but unused PTO per state law and policy.
- Say less, not more. Keep the termination conversation brief, factual, and respectful. Avoid comments about age, health, family, or accent.
- Loop in HR or counsel when there is any hint of protected activity or a protected characteristic in the picture.
Practical Steps for Employees Fired During Probation
If you were fired in your first 90 days and suspect an illegal reason:
- Write down what happened while it is fresh - dates, who said what, and any complaint or request you made shortly before the firing.
- Save evidence - emails, texts, your offer letter, the handbook, and any performance feedback (which is often hard to square with being fired for "performance").
- Apply for unemployment. Being on probation does not disqualify you; eligibility depends on your state's rules and why you were let go.
- Confirm your final pay arrived on time and in full under your state's law; contact your state labor department for wage issues.
- File a charge if you suspect discrimination or retaliation. For most discrimination claims you file with the EEOC or your state fair-employment agency. There is a strict filing deadline - commonly 180 days, extended to 300 days in many states - so do not wait. The exact deadline depends on your state, so check promptly.
- Wage complaints go to the U.S. Department of Labor Wage and Hour Division or your state labor agency; safety retaliation goes to OSHA, which has its own short filing window.
The Bottom Line
Probation and the "first 90 days" make it easier to part ways for ordinary reasons like poor fit or weak performance, and that is perfectly legal. What does not change is the list of reasons the law forbids. Treat day-one protections as fully in force, document honestly, stay consistent, and the probationary period works as intended - as a structured trial, not a legal loophole. This is general information to help you ask the right questions, not legal advice about your specific situation.
The law behind your rights at work
Employers must comply with overlapping federal wage-hour, anti-discrimination, leave, and safety laws, plus their state’s rules.
Key federal laws:
Where to get help or file a complaint:
Your state and city matter. Federal law is the floor — many states and cities require higher pay, more leave, and broader protections. Always check your state’s rules (and any local ordinances) in addition to the federal laws above. This is general legal information, not legal advice.
Frequently asked questions
Can I fire an employee during the probation period?
Generally yes. In an at-will state you can end the relationship during probation for poor performance, attendance, or fit. But you still cannot fire for an illegal reason - discrimination based on a protected class or retaliation for protected activity is unlawful from the first day of work, probation or not.
Can you fire an employee in the first 90 days for any reason?
Almost any lawful reason, yes. The first 90 days do not suspend anti-discrimination or anti-retaliation law. You cannot fire someone because of race, sex, pregnancy, religion, national origin, disability, age 40+, or because they reported harassment, a safety hazard, or unpaid wages.
Does a probationary employee have fewer legal rights than a permanent one?
No. Federal protections under Title VII, the ADA, the ADEA, and others apply regardless of tenure (subject to employer size). The main difference is FMLA leave, which usually requires about 12 months and 1,250 hours of service, so most new hires are not yet eligible.
What is the safest way to document a probationary termination?
Write down the specific, lawful reason with dates and examples before the meeting, apply the same standard you use for other new hires, and confirm there was no recent protected activity like an accommodation request or a complaint. Keep all reviews, warnings, and the decision in the personnel file.
I was fired during probation and think it was discrimination - what do I do?
Document what happened and save your emails, offer letter, and any positive feedback. File a charge with the EEOC or your state fair-employment agency promptly, because deadlines are strict - commonly 180 or 300 days depending on your state. Apply for unemployment and confirm your final pay arrived on time.
This article is general legal information, not legal advice, and may not reflect the most current law or the law in your jurisdiction. Laws vary by state and change over time. For advice about your specific situation, consult a licensed attorney.
