How Does FMLA Work? Eligibility, 12 Weeks, and Job Protection

The Family and Medical Leave Act works by giving eligible employees up to 12 workweeks of unpaid, job-protected leave in a 12-month period for a new child, a serious health condition, a family member’s serious health condition, or certain military-related needs. While you are out, your employer keeps your group health insurance in place on the same terms as before. When you come back, you return to the same job or one with equivalent pay, benefits, and working conditions. The law does not pay you, and it does not cover every worker or every illness, so how it applies to your situation depends on a handful of specific tests.

Who Qualifies

Three conditions have to line up at the moment your leave begins.¹ You must have worked for your employer for at least 12 months (not necessarily consecutive, though a gap over seven years usually erases earlier service). You must have logged at least 1,250 hours of actual work in the 12 months before leave starts; paid time off and prior FMLA leave don’t count toward that number. And your employer must have at least 50 employees within a 75-mile radius of your worksite.²

Private companies are covered if they employ 50 or more workers for at least 20 workweeks in the current or previous calendar year. Public agencies at every level of government are covered no matter their size. Public and private elementary and secondary schools are also covered regardless of size, though the individual 75-mile/50-employee worksite test still applies to their employees.³

If your employer is too small for federal FMLA, that is not necessarily the end of the road. Some states have their own family and medical leave laws, and a few cover employers with as few as one employee. Check your state’s law separately.

What You Can Use FMLA Leave For

Five categories of situations qualify:⁴

The birth of your child and bonding during the first 12 months.
Placement of a child with you for adoption or foster care, and bonding during the first year after placement.
Caring for your spouse, child, or parent who has a serious health condition.
Your own serious health condition that keeps you from doing your job.
Qualifying exigencies arising from a spouse, child, or parent’s covered active duty or call to active duty, such as short-notice deployment arrangements, childcare changes, financial and legal planning, and military-sponsored events or counseling.

Family for FMLA purposes means your spouse (including a same-sex spouse whose marriage was valid where performed), your child (biological, adopted, foster, stepchild, or a child you stand in the day-to-day parental role for), and your parent (including someone who raised you in that role).⁵ FMLA does not cover leave to care for siblings, grandparents, or in-laws.

A separate, larger entitlement exists for caring for a covered servicemember with a serious injury or illness. If you are the servicemember’s spouse, child, parent, or next of kin, you can take up to 26 workweeks in a single 12-month period, available once per servicemember, per injury.⁴

What Counts as a Serious Health Condition

Not every illness clears the bar. A serious health condition is an illness, injury, or physical or mental condition that involves either inpatient care (an overnight stay in a hospital, hospice, or residential medical facility) or continuing treatment by a health care provider.⁶

Continuing treatment covers several patterns:

Incapacity lasting more than three consecutive days combined with treatment by a health care provider (typically two visits, or one visit followed by an ongoing course of treatment such as prescription medication).
Pregnancy and prenatal care, including severe morning sickness.
Chronic conditions such as asthma, diabetes, or epilepsy that cause periodic episodes of incapacity and require periodic provider visits.
Permanent or long-term conditions such as Alzheimer’s or a terminal illness, even without effective treatment, as long as the person is under provider supervision.
Conditions requiring multiple treatments, such as chemotherapy, physical therapy, or dialysis.

A common cold or ordinary flu generally does not qualify unless it develops into something involving inpatient care or an extended incapacity with ongoing treatment.

How Much Leave You Get and How the Year Is Measured

Eligible employees get up to 12 workweeks of FMLA leave in a 12-month period for the standard qualifying reasons.⁴ Your employer picks how that 12-month window is measured: the calendar year, a fixed year such as the fiscal year or your hire anniversary, a 12-month period counted forward from your first day of leave, or a rolling period counted backward from each day you use leave.⁷ The choice matters, because a rolling backward method keeps you from stacking two 12-week blocks the way a calendar-year method can. If your employer has never chosen or communicated a method, the option most generous to you applies.

Whether You Get Paid

FMLA leave is unpaid on its own. Pay can still come from other sources running alongside it. Your employer can require you to use accrued paid vacation, sick, or personal time during FMLA leave, and you can choose to use it voluntarily.⁸ When paid leave runs concurrently with FMLA, both clocks run at once: you get a paycheck, and the weeks still count against your 12-week entitlement.

One limit: if you are already receiving payments through a disability benefit plan or workers’ compensation, neither you nor your employer can force accrued paid leave to be substituted for that period.⁸

About a third of states plus the District of Columbia now run their own paid family and medical leave programs providing partial wage replacement. Benefit amounts, eligibility, and duration vary by state, and those benefits may coordinate with or run alongside your federal FMLA protection.

How to Request FMLA Leave

When your need for leave is foreseeable, such as a scheduled surgery, an expected due date, or a planned adoption, give your employer at least 30 days’ advance notice.⁹ For unexpected situations, notify your employer as soon as practicable, usually following your workplace’s normal call-in procedures.

You do not have to say the words “FMLA.” Giving enough information for your employer to understand that the absence may qualify (a hospitalization, a family medical emergency, a new child) is enough. From there, the employer is responsible for figuring out whether the leave qualifies.

Your employer can ask for a medical certification from your health care provider. The Department of Labor offers optional forms: WH-380-E for your own condition and WH-380-F for a family member’s.¹⁰ Once your employer requests certification, you have at least 15 calendar days to return the completed form; if that isn’t practical, get it in as soon as you reasonably can.¹¹ Failing to produce adequate certification can cost you the leave. If your employer has reason to doubt the certification, it can require a second opinion at its own expense, and if the first two conflict, a third opinion (jointly chosen and binding) can be required.¹²

Your employer has obligations back to you. Within five business days after you give notice, it must send you a Notice of Eligibility and Rights and Responsibilities (Form WH-381) telling you whether you meet the eligibility requirements and what is expected during leave.¹³ Once it has enough information to decide, it must issue a Designation Notice (Form WH-382) within five business days confirming that the time will be counted as FMLA, whether paid leave will run concurrently, and whether a fitness-for-duty certification will be required before you return.¹⁴ If the leave doesn’t qualify, that has to be in writing.

Taking Leave in Pieces

FMLA leave doesn’t have to run in one continuous block. If you have a chronic condition that flares up, or you need ongoing treatments such as chemotherapy or physical therapy, you can take the time in smaller increments. This is called intermittent leave. You can also shift temporarily to a reduced schedule, cutting hours rather than stopping work entirely. Your employer must track the time in increments no larger than the smallest it uses for other leave, and no larger than one hour, and it cannot make you take more leave than the situation actually calls for.¹⁵

Intermittent leave to bond with a new child (birth, adoption, or foster placement) requires the employer’s agreement. Intermittent leave for a serious health condition cannot be denied when it is medically necessary.

What You Keep While Out and When You Return

Your group health insurance continues on the same terms as if you were still working.¹⁶ If you normally pay a share of the premium through payroll deductions, you are still responsible for that share; you and your employer will need to arrange how the payments happen. If you don’t come back after your leave ends, your employer can recover the premiums it paid, unless you stayed out because of a continuing serious health condition or something else beyond your control.¹⁷

When you return, your employer must put you back in the same job you held before, or in one with the same pay, benefits, and working conditions.¹⁶ The leave cannot cost you seniority, pay, or your position level. It is also illegal for your employer to interfere with your right to take FMLA leave, or to fire or punish you for requesting or using it, filing a complaint, participating in an investigation, or testifying in a related proceeding.¹⁸

Two exceptions to job restoration exist. First, if you are a salaried employee in the highest-paid 10 percent of all employees within 75 miles of your worksite, your employer can designate you a “key employee” and deny restoration if reinstating you would cause substantial and grievous economic injury to the business.¹⁹ The employer has to give you timely notice of that status, or it loses the right to deny restoration; either way, you keep the right to the leave itself and to continued health insurance.²⁰ Second, FMLA does not give you more job security than you would have had without leave. If your position would have been eliminated in a layoff or shift cut regardless of your absence, your employer does not have to reinstate you, but it carries the burden of proving that.²¹

If Your Employer Violates the FMLA

You have two paths. You can file a complaint with the Department of Labor’s Wage and Hour Division at 1-866-487-9243, or you can file a private lawsuit in federal or state court.²² Wage and Hour Division complaints are kept confidential, and your employer cannot retaliate against you for filing one.²³

A private lawsuit generally has to be filed within two years of the last violation, or within three years if the violation was willful. A successful claim can recover lost wages, salary, bonuses, and benefits with interest; liquidated damages equal to that amount (essentially doubling the award) unless the employer proves it acted in good faith; a court order for reinstatement or promotion; and reasonable attorney’s fees and court costs. These remedies apply to any employer that violates the law, including public agencies.²⁴

1
eCFR. 29 CFR 825.110 – Eligible Employee
2
U.S. Department of Labor. Fact Sheet 28 – The Family and Medical Leave Act
3
eCFR. 29 CFR Part 825 Subpart F – Special Rules Applicable to Employees of Schools
4
Office of the Law Revision Counsel. 29 USC 2612 – Leave Requirement
5
U.S. Department of Labor. Fact Sheet 28L – Leave Under the Family and Medical Leave Act for Spouses
6
Office of the Law Revision Counsel. 29 USC 2611 – Definitions
7
eCFR. 29 CFR 825.200 – Amount of Leave
8
eCFR. 29 CFR 825.207 – Substitution of Paid Leave
9
eCFR. 29 CFR 825.302 – Employee Notice Requirements for Foreseeable FMLA Leave
10
eCFR. 29 CFR 825.306 – Content of Medical Certification
11
eCFR. 29 CFR 825.305 – Certification, General Rule
12
eCFR. 29 CFR 825.307 – Second and Third Opinions
13
U.S. Department of Labor. Notice of Eligibility and Rights and Responsibilities Under the Family and Medical Leave Act
14
U.S. Department of Labor. Fact Sheet 28D – Employer Notification Requirements Under the Family and Medical Leave Act
15
eCFR. 29 CFR 825.205 – Increments of FMLA Leave for Intermittent or Reduced Schedule Leave
16
Office of the Law Revision Counsel. 29 USC 2614 – Employment and Benefits Protection
17
U.S. Department of Labor. Employer Recovery of Benefit Costs
18
Office of the Law Revision Counsel. 29 USC 2615 – Prohibited Acts
19
eCFR. 29 CFR 825.217 – Key Employee, General Rule
20
eCFR. 29 CFR 825.219 – Rights of a Key Employee
21
eCFR. 29 CFR 825.216 – Limitations on an Employees Right to Reinstatement
22
U.S. Department of Labor. Family and Medical Leave Act Advisor – Enforcement of the FMLA
23
U.S. Department of Labor. How to File a Complaint
24
Office of the Law Revision Counsel. 29 USC 2617 – Enforcement