What Is Intermittent FMLA Leave and How Does It Work?

Intermittent FMLA leave lets you use your 12 weeks of federally protected time off in separate blocks — hours, days, or a reduced weekly schedule — instead of one continuous absence. It’s designed for situations like recurring chemotherapy, dialysis, physical therapy, chronic condition flare-ups, therapy appointments, or helping a parent get to treatment. The leave itself is unpaid at the federal level, but your job and your group health insurance stay protected while you use it.

How the Small Blocks Actually Work

Continuous FMLA is one long absence. Intermittent FMLA breaks the same 12-week entitlement into smaller withdrawals. You might leave two hours early every Tuesday for an infusion, take a full day off when a migraine hits, or drop from an eight-hour day to six hours while you recover. Only the actual time you miss counts against your 12 weeks.

The smallest increment your employer can charge against your FMLA bank is tied to the smallest increment it uses for any other kind of leave. If sick time is tracked in 15-minute blocks, FMLA has to be tracked in 15-minute blocks. If nothing is tracked below an hour, the floor is one hour. Your employer can’t round up or force you to use more leave than you actually took.¹

A reduced schedule works the same way arithmetically. Two missed hours a day, five days a week, is ten hours charged against your entitlement each week.

Who Qualifies

Three conditions all have to be true before you can use any FMLA, intermittent or otherwise:

You’ve worked for your employer for at least 12 months total. They don’t need to be consecutive.
You’ve logged at least 1,250 hours in the 12 months right before the leave starts.
Your employer has at least 50 employees within 75 miles of your worksite.

Private employers are covered if they have 50 or more employees during at least 20 workweeks in the current or prior calendar year. Public agencies and public and private elementary and secondary schools are covered regardless of headcount.²

What You Can Take Intermittent Leave For

Not every FMLA reason automatically supports intermittent use. The distinction matters.

Your Own Serious Health Condition

This is the biggest bucket. A serious health condition means either an overnight stay in a medical facility or a condition that requires ongoing treatment and keeps you from doing your job. Chemotherapy, dialysis, physical therapy, recurring migraines, autoimmune flare-ups, and mental health treatment including therapy sessions all qualify.³ You don’t need your employer’s permission to take this leave intermittently.

Caring for a Family Member

You can take intermittent leave to care for a spouse, child, or parent with a serious health condition. “Care” is broader than most people think. It covers driving a parent to appointments, helping with daily activities, and providing psychological comfort during treatment.³

Bonding With a New Child

Here’s the trap. Leave to bond with a newborn, newly adopted, or newly placed foster child must be used within one year of the event, and taking it intermittently requires your employer’s agreement.⁴ If the employer says no, bonding leave has to be taken in one continuous block. The exception is when the mother or child has a serious health condition; then intermittent use is available without consent.

Military-Related Reasons

Qualifying exigencies tied to a family member’s active duty (arranging childcare, attending military events, handling legal or financial matters) can be taken intermittently. A separate, larger entitlement of up to 26 workweeks in a single 12-month period is available to care for a covered service member with a serious injury or illness.⁵

Requesting the Leave

Two steps: notice, then medical certification.

For foreseeable treatments, you owe your employer at least 30 days’ notice. When something is unforeseeable — a sudden flare-up, an emergency — notify your employer as soon as practicable, usually the same or next business day.⁶ You don’t need to say the words “FMLA.” You just need to give enough information for your employer to recognize that the absence may qualify. From there, the employer has five business days to tell you whether you’re eligible and to spell out your rights and responsibilities.

Your employer can require a medical certification from your healthcare provider. The Department of Labor offers optional forms (WH-380-E for your own condition, WH-380-F for a family member’s). The certification should include when the condition began, how long it’s expected to last, and an estimate of how often and how long your intermittent absences will be. You have 15 calendar days to return the completed form.

If your employer doubts the certification, it can require a second opinion from a doctor of its choice at its expense, and a binding third opinion if the first two disagree.⁷ Your FMLA benefits are provisionally in place while that plays out.

How Your 12 Weeks Get Counted

Only the actual time you miss counts. Work 40 hours a week, take four hours off for an appointment, and you’ve used one-tenth of a workweek.⁸

What can make or break your available balance is how your employer defines the 12-month “leave year.” There are four legal methods, and the choice matters a lot for people on intermittent leave:

Calendar year: January 1 through December 31.
A fixed 12-month period like a fiscal year or your work anniversary.
A forward-looking year measured from the first day you take FMLA leave.
A rolling year measured backward from each day you use FMLA leave.

The rolling method is the tightest, because your available balance keeps shifting based on what you’ve used in the past 12 months. The calendar method can be the most generous, since your full 12 weeks reset every January 1. Ask HR which method your employer uses. Whatever it is, the employer has to apply the same method to everyone.⁸

Recertification

Employers can ask you to recertify a condition, generally no more than every 30 days and in connection with an actual absence. If your certification says the condition will last longer than 30 days, the employer has to wait out that minimum before requesting recertification. Either way, recertification can always be requested every six months in connection with an absence.⁹ Sooner requests are allowed only if you ask for an extension, your absence pattern has changed significantly from what the certification described, or the employer receives information casting doubt on your stated reason.

Getting Paid During Intermittent Leave

FMLA itself is unpaid. That surprises people. The law protects your job, not your paycheck. But pay can come from other sources during the same absences.

You can choose to use accrued paid time off (vacation, sick, personal) to cover FMLA absences and still get paid. Your employer can also require you to use paid leave first, as long as the normal conditions of that paid leave policy are met.¹⁰ Either way, the time still counts against your 12 weeks. You’re layering pay onto FMLA-protected time, not stacking one on top of the other.

Two exceptions: if the absence is already covered by short-term disability or workers’ compensation, neither side can require paid leave to be substituted for that period. Once those benefits end, the normal substitution rules resume.¹⁰

More than a dozen states and the District of Columbia also run their own paid family and medical leave programs, typically providing partial wage replacement. In those states, paid leave often runs concurrently with FMLA, giving you job protection under federal law and a partial check from the state. Check with your state labor agency for whether the program covers intermittent use.

What Your Employer Can and Can’t Do

When your intermittent leave involves planned treatment, you have to make a reasonable effort to schedule it so it doesn’t unduly disrupt operations.¹¹ If your doctor offers Tuesday or Thursday and Thursday is the office’s busiest day, you should try for Tuesday. This doesn’t apply to unforeseeable flare-ups.

Your employer can also temporarily move you to a different position that better accommodates a predictable intermittent or reduced schedule. Pay and benefits have to stay equivalent, though the duties don’t. The transfer can’t be punitive — no shifting a desk worker to manual labor, no moving someone to the overnight shift or a distant office to discourage the leave. When you return to your full schedule, you go back to your original job or an equivalent one.¹²

The line employers cross most often is attendance policy. FMLA-protected absences cannot be counted against you in a points-based or “no fault” attendance system, and they cannot be used as a negative factor in hiring, promotion, or discipline.¹³

Your Job and Health Insurance

Each time you come back from a block of intermittent leave, your employer has to restore you to the same position or an equivalent one with the same pay, benefits, and working conditions.¹⁴ You keep the benefits you’d already accrued, though you don’t accrue new seniority or benefits during the leave itself. A narrow “key employee” exception lets employers deny reinstatement to certain salaried workers in the highest-paid 10 percent within 75 miles of the worksite when restoration would cause substantial and grievous economic injury, but it is rarely used.

Your group health insurance has to be maintained on the same terms as if you were still working, and you keep paying your share of the premiums. If you don’t return after exhausting your leave, the employer may recover the premiums it paid during your absence — unless you didn’t return because of a continuing serious health condition or other circumstances beyond your control.¹⁵

For intermittent leave specifically, an employer can require a fitness-for-duty certification only if there are reasonable safety concerns tied to the condition, and no more than once every 30 days.¹⁶

If Your Employer Violates Your Rights

The law specifically prohibits refusing to authorize leave for an eligible employee, discouraging use, manipulating hours to duck FMLA obligations, and counting FMLA absences in attendance policies.¹³ You can file a complaint with the Department of Labor’s Wage and Hour Division at 1-866-487-9243 or through a local office, or file a private lawsuit. You have two years from the last violation to act, or three years if the violation was willful.¹⁷

When the 12 Weeks Run Out

Twelve weeks of intermittent leave can disappear quickly with a chronic condition. Once you’ve exhausted your entitlement, your job protection under FMLA ends. The Americans with Disabilities Act, however, may require your employer to provide additional unpaid leave as a reasonable accommodation. The EEOC has said that compliance with FMLA doesn’t automatically satisfy an employer’s ADA obligations, and the fact that additional leave would go beyond the 12-week FMLA limit is not by itself enough to prove undue hardship.¹⁸ If you can see your 12 weeks running out and you still need time, raise the ADA question with your employer before the entitlement is gone rather than after.

1
eCFR. 29 CFR 825.205 – Increments of FMLA Leave for Intermittent or Reduced Schedule Leave
2
U.S. Department of Labor. Family and Medical Leave Act
3
U.S. Department of Labor. Fact Sheet 28O – Mental Health Conditions and the FMLA
4
U.S. Department of Labor. Fact Sheet 28Q – Taking Leave from Work for the Birth, Placement, and Bonding with a Child Under the FMLA
5
U.S. Department of Labor. Fact Sheet 28 – The Family and Medical Leave Act
6
eCFR. 29 CFR 825.302 – Employee Notice Requirements for Foreseeable FMLA Leave
7
eCFR. 29 CFR 825.307 – Authentication and Clarification of Medical Certification; Second and Third Opinions
8
U.S. Department of Labor. Fact Sheet 28H – 12-Month Period Under the Family and Medical Leave Act
9
eCFR. 29 CFR 825.308 – Recertifications for Leave Taken Because of an Employee’s Own Serious Health Condition or the Serious Health Condition of a Family Member
10
eCFR. 29 CFR 825.207 – Substitution of Paid Leave
11
eCFR. 29 CFR 825.203 – Scheduling of Intermittent or Reduced Schedule Leave
12
eCFR. 29 CFR 825.204 – Transfer of an Employee to an Alternative Position During Intermittent Leave or Reduced Schedule Leave
13
U.S. Department of Labor. Fact Sheet 77B – Protection for Individuals Under the FMLA
14
Office of the Law Revision Counsel. 29 USC 2614 – Employment and Benefits Protection
15
U.S. Department of Labor. elaws – Family and Medical Leave Act Advisor
16
U.S. Department of Labor. FMLA Frequently Asked Questions
17
U.S. Department of Labor. elaws – Family and Medical Leave Act Advisor
18
U.S. Equal Employment Opportunity Commission. Employer-Provided Leave and the Americans with Disabilities Act