In most situations, an employer can deny an employee’s request for unpaid time off, and that denial is legal. The default rule under at-will employment is that scheduling and leave are the employer’s call. But several federal laws, a growing set of state laws, and sometimes the company’s own written policies override that default, so the real answer to whether an employer can deny unpaid time off depends on why you need the time and which protections apply to you.
The Default Rule Favors the Employer
Most jobs in the United States are at-will. Without a statute or contract saying otherwise, your employer decides when you work, when you can be off, and whether an unpaid absence gets approved. “We’re short-staffed” is a legally sufficient reason to say no.
The consequence is blunt. If you take time off that was denied, and no legal protection covers your reason, your employer can fire you. That is not retaliation in any legal sense; it is treated like any other policy violation. The protections below are the exceptions that flip the default.
FMLA Leave Your Employer Cannot Refuse
The Family and Medical Leave Act is the broadest federal protection. It covers employers with 50 or more employees within 75 miles of your worksite, and you must have worked there for at least 12 months and logged 1,250 hours in the prior year.1eCFR. 29 CFR Part 825 – The Family and Medical Leave Act of 1993 Meet those thresholds, and your employer cannot deny qualifying leave.
Eligible employees get up to 12 weeks of unpaid, job-protected leave in a 12-month period for:
- The birth of a child or the placement of a child through adoption or foster care.
- Your own serious health condition that prevents you from doing your job.
- Caring for a spouse, child, or parent with a serious health condition.
- A qualifying exigency arising from a family member’s active-duty military service.
A separate provision allows up to 26 weeks in a 12-month period to care for a covered servicemember with a serious injury or illness.1eCFR. 29 CFR Part 825 – The Family and Medical Leave Act of 1993 When you come back, your employer must restore you to the same position or an equivalent one with the same pay, benefits, and working conditions.
Notice matters. For foreseeable leave, such as a scheduled surgery or expected birth, you owe your employer at least 30 days’ notice. If the need is not foreseeable, you should notify your employer the same day you learn of it or the next business day.2eCFR. 29 CFR 825.302 – Employee Notice Requirements for Foreseeable FMLA Leave Your employer can also require medical certification, and you generally have 15 calendar days to provide it. Miss that window without a valid reason and the leave loses FMLA protection.3eCFR. 29 CFR 825.313 – Failure to Provide Certification
Disability Leave Under the ADA
The Americans with Disabilities Act works differently. Rather than granting a fixed block of leave, it requires employers with 15 or more employees to provide unpaid leave as a “reasonable accommodation” when a disability requires it. There is no set maximum. The employer must grant the leave unless doing so would cause significant difficulty or expense.4U.S. Equal Employment Opportunity Commission. Employer-Provided Leave and the Americans with Disabilities Act
This becomes critical when FMLA leave runs out. If you have used all 12 weeks and still cannot work because of a disability, the employer cannot automatically terminate you. It has to consider whether more unpaid leave is a reasonable accommodation before making that call.5U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Reasonable Accommodation and Undue Hardship Under the ADA
Whether more leave counts as an “undue hardship” depends on the employer’s size and resources, the cost of covering your absence, how the absence affects coworkers, and whether you can give a fixed return date. A large employer that can absorb the disruption has a harder time justifying a denial than a small operation where one absence stops production.5U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Reasonable Accommodation and Undue Hardship Under the ADA
You do not need to use the phrase “reasonable accommodation” or cite the ADA to request leave. Telling your employer that a medical condition is keeping you from working is enough to trigger the “interactive process,” a back-and-forth about your limitations and possible accommodations. And your employer cannot require you to be “100% healed” before letting you return; if you can do the job with an accommodation, blocking your return violates the ADA.4U.S. Equal Employment Opportunity Commission. Employer-Provided Leave and the Americans with Disabilities Act
Military Service Leave Under USERRA
The Uniformed Services Employment and Reemployment Rights Act applies to every employer, no matter how small. If you leave to serve in the military, the employer must treat your absence as a leave of absence and give you the same non-seniority benefits it provides other employees on leave.6eCFR. 20 CFR Part 1002 Subpart D – Rights, Benefits, and Obligations of Persons Absent from Employment Due to Service in the Uniformed Services
You must give advance notice, but it can be written or verbal and can come from you or your military branch. No notice is required when military necessity makes it impossible. Reemployment rights generally apply as long as your cumulative service with that employer stays under five years, with several exemptions including annual training and involuntary service during national emergencies.7U.S. Department of Labor. USERRA – A Guide to the Uniformed Services Employment and Reemployment Rights Act
Pregnancy-Related Leave Under the PWFA
The Pregnant Workers Fairness Act, effective in June 2023, closed a gap that the FMLA and ADA left open. It requires employers with 15 or more employees to provide reasonable accommodations for known limitations related to pregnancy, childbirth, or related medical conditions, unless doing so would cause undue hardship.8U.S. Equal Employment Opportunity Commission. Pregnant Workers Fairness Act
Before the PWFA, a pregnant worker with severe morning sickness might not qualify for FMLA leave (employer too small or not enough tenure) and might struggle to fit her condition under the ADA. The PWFA covers accommodations such as schedule adjustments, time off for prenatal appointments, and leave when the condition requires it, using an interactive process similar to the ADA’s.
Time Off for Religious Observances
Title VII of the Civil Rights Act requires employers with 15 or more employees to reasonably accommodate an employee’s sincerely held religious beliefs when they conflict with a work schedule.9U.S. Equal Employment Opportunity Commission. Fact Sheet – Religious Accommodations in the Workplace That commonly means shift swaps, flexible scheduling, or unpaid time off for Sabbath observance and religious holidays.
For decades, employers could deny these requests by pointing to almost any cost. In 2023, the Supreme Court raised the bar in Groff v. DeJoy, holding that an employer must show the accommodation would result in “substantial increased costs in relation to the conduct of its particular business.” Coworker resentment and general discomfort do not count.10Supreme Court of the United States. Groff v. DeJoy (Opinion) A blanket refusal to accommodate religious observance is now much harder to defend.
State and Local Leave Protections
Federal law is a floor, not a ceiling. Many states extend family and medical leave to employers that fall below the FMLA’s 50-employee threshold, sometimes down to a single employee, and some use tiered systems where smaller employers must offer a reduced amount of leave. State rules vary a lot, so checking your specific state is worth the effort.
Beyond family and medical leave, states commonly require employers to allow unpaid time off for the following reasons:
- Jury duty. Nearly every state prohibits firing or penalizing an employee for jury service.
- Voting. A majority of states require time off to vote, typically one to four hours, sometimes paid.
- Domestic violence. Many states allow victims to take leave for medical treatment, protective orders, or court proceedings.
- School activities. Some states give parents a set number of hours per year for parent-teacher conferences and similar events.
- Emergency responder duty. Certain states protect volunteer firefighters and emergency medical personnel called out during work hours.
One boundary worth flagging: no federal law requires private employers to grant bereavement leave. A handful of states have started to, but coverage is inconsistent, and in most of the country a denied bereavement request is a lawful denial.
Discriminatory or Retaliatory Denials Are Illegal Anyway
Even when no specific leave law applies, a denial can still be illegal if the reason behind it is discriminatory or retaliatory. Title VII bars employers with 15 or more employees from making employment decisions based on race, color, religion, sex, or national origin.11Office of the Law Revision Counsel. 42 USC 2000e – Definitions In Bostock v. Clayton County, the Supreme Court confirmed that sex discrimination covers sexual orientation and gender identity.12Supreme Court of the United States. Bostock v. Clayton County Approving one worker’s unpaid time off request and denying an identical one from a protected coworker, without a legitimate reason, is unlawful discrimination.
Retaliation is a separate violation. The FMLA specifically makes it illegal for an employer to interfere with leave rights or to punish an employee for filing a complaint or participating in an investigation.13Office of the Law Revision Counsel. 29 USC 2615 – Prohibited Acts If you report harassment and a routine leave request gets denied two weeks later, that timing alone can support a retaliation claim.
What Your Employer’s Own Policy Says
Even when no law forces the issue, your employer may have created its own obligation through an employee handbook, collective bargaining agreement, or individual contract. If the written policy describes how to request unpaid leave and the conditions for approval, the employer is expected to follow it.
Selective enforcement is its own risk. An employer that grants unpaid leave to some employees while denying identical requests from others, with no legitimate business reason for the difference, creates a discrimination claim even when the underlying leave was never legally required.
If Your Protected Leave Was Denied
The right enforcement path depends on which law protects your leave. For FMLA violations, you can file a complaint with the Wage and Hour Division of the U.S. Department of Labor in person, by mail, or by phone, or you can skip the agency and sue. The statute of limitations is two years from the last violation, three years if it was willful.14U.S. Department of Labor. Family and Medical Leave Act Advisor – Enforcement of the FMLA Successful claims can recover back pay, an equal amount in liquidated damages, and attorney fees.
For discrimination under Title VII, the ADA, or the PWFA, you have to file a charge with the Equal Employment Opportunity Commission before you can sue. The deadline is 180 calendar days from the denial, extended to 300 days in states with their own anti-discrimination agency enforcing a similar law.15U.S. Equal Employment Opportunity Commission. Time Limits for Filing a Charge These deadlines are strict. Filing an internal grievance or pursuing union arbitration does not pause the clock.
Document everything from the start. Put your leave request in writing, keep any written denial, and save notes on relevant conversations with dates. A paper trail is what separates claims that succeed from claims that stall.