The Family and Medical Leave Act (FMLA) is the federal law that gives eligible employees up to 12 workweeks of unpaid, job-protected leave in a 12-month period for qualifying family and medical reasons, with continued group health coverage during the leave. It is enforced by the U.S. Department of Labor's Wage and Hour Division, and the leave entitlement itself sits at 29 U.S.C. 2612. The two words that matter most are "unpaid" and "job-protected": FMLA does not create a paycheck, it creates the right to come back.
Not everyone is covered, not every illness qualifies, and the request process has real procedural rules on both sides. Here is how it actually works.
Who is eligible for FMLA leave?
Three tests, all of which must be met at the time leave starts:
Your employer is covered. Private employers are covered if they have 50 or more employees for at least 20 workweeks in the current or prior year. Public agencies and public schools are covered regardless of size.
You have enough tenure and hours. You must have worked for the employer for at least 12 months (not necessarily consecutive), and worked at least 1,250 hours in the 12 months immediately before the leave. The hours test is roughly 24 hours a week on average, which is why some part-time employees do not qualify.
Your worksite passes the headcount test. The employer must have at least 50 employees within 75 miles of your worksite. An employee at a company's isolated 10-person satellite office may be out of luck even though the company overall is large.
Roughly speaking, this leaves a large share of the private workforce outside FMLA coverage, which is one reason many states have built their own leave programs on top of it.
What reasons qualify for FMLA leave?
The core qualifying reasons:
Your own serious health condition that makes you unable to perform the essential functions of your job. A serious health condition generally means an overnight stay in a medical facility, or continuing treatment by a health care provider, which includes conditions involving more than three consecutive days of incapacity plus treatment, pregnancy, chronic conditions like asthma or diabetes that flare periodically, and long-term conditions. The common cold and routine cosmetic treatments do not qualify; a migraine condition managed by a physician very well might.
The birth of a child, and bonding with the newborn within one year of birth.
Adoption or foster placement, and bonding within one year of placement.
Caring for a spouse, child, or parent with a serious health condition. Note the list: parents-in-law are not included, and adult children are covered only in limited circumstances involving disability.
Military family reasons. A qualifying exigency arising from a family member's covered active duty supports regular FMLA leave, and a separate provision grants up to 26 workweeks in a single 12-month period to care for a covered servicemember or veteran with a serious injury or illness.
Leave does not have to be taken all at once. Intermittent leave, taken in separate blocks or as a reduced schedule, is available when medically necessary, which is how FMLA covers chemotherapy appointments, physical therapy, and flare-ups of chronic conditions. For bonding leave, intermittent use requires employer agreement.
Is FMLA leave paid?
No. FMLA itself is unpaid. Three things soften that in practice.
First, substitution of paid leave: you may choose, or your employer may require you, to run accrued vacation, sick, or PTO time concurrently with FMLA leave, so you are paid for part of it while the FMLA clock runs.
Second, short-term disability insurance, where you have it, often pays a percentage of wages during a medical leave that is simultaneously FMLA-protected.
Third, a growing list of states runs paid family and medical leave programs funded through payroll deductions, and several more launch over the next few years. These state programs pay a portion of wages, run on their own eligibility rules, and typically run concurrently with FMLA when both apply. If you are in a paid-leave state, you generally file two processes at once: the FMLA designation with your employer and the wage-replacement claim with the state.
How do you request FMLA leave?
Give notice. For foreseeable leave, such as a scheduled surgery or a due date, you must give at least 30 days notice, or as much as practicable. For unforeseeable leave, notice as soon as practicable, generally the same or next business day, following your employer's usual call-in procedures. You do not have to say the letters "FMLA," but you must give enough information to signal a potentially qualifying reason. "I am sick today" does not do it; "I am being admitted for surgery and will be out three weeks" does.
Expect certification. Your employer may require a medical certification from the health care provider, usually on the DOL's WH-380 form, and must give you at least 15 calendar days to return it. Employers can seek clarification through proper channels, and in some circumstances require a second opinion at their own expense.
Watch for the designation notice. Once the employer has enough information, it must notify you of your eligibility within five business days of the request and then formally designate the leave as FMLA-qualifying, counting it against your 12-week entitlement. Employers cannot retroactively spring a designation on you months later without notice, and they cannot decline to designate qualifying leave to "save" your FMLA time while exposing you to attendance discipline.
Documentation discipline helps enormously here. Keep copies of every request, certification, and notice, and confirm verbal conversations by email. Most FMLA disputes are won or lost on the paper trail.
What protections do you have during and after leave?
Reinstatement. At the end of FMLA leave you are entitled to be restored to the same job or an equivalent one, with equivalent pay, benefits, and terms. There is a narrow key employee exception for certain highly compensated employees where restoration would cause substantial economic injury, and it requires specific notices.
Benefits continuation. Your employer must maintain your group health coverage on the same terms during leave, meaning you keep paying your normal employee share.
No interference or retaliation. It is unlawful for an employer to interfere with FMLA rights or to retaliate against you for using them. Counting FMLA absences as points in a no-fault attendance policy, cutting hours after leave to push you under 1,250 for next year, or a suspiciously timed termination after a leave request all raise interference and retaliation issues. Remedies can include lost wages, liquidated damages, and reinstatement, enforced through a DOL complaint or a private lawsuit.
How does FMLA interact with the ADA and state law?
FMLA is one layer of a stack. The Americans with Disabilities Act may require additional unpaid leave as a reasonable accommodation even after FMLA runs out, for employees with qualifying disabilities. Workers' compensation covers on-the-job injuries and can run concurrently with FMLA. And state family-leave laws often cover smaller employers, more family members, or longer periods than the federal floor. Which laws apply, and in what combination, depends on your state, your employer's size, and the medical facts, and the answer changes what your employer can lawfully do next.
The practical takeaway: if a health event or a new child is on your horizon, check your eligibility early, give notice in writing, return certifications on time, and keep every document. FMLA rights are strong, but they reward the person who works the process.