Intermittent FMLA Leave Explained: Definition, Eligibility & How It Works

Intermittent FMLA leave is a provision under the Family and Medical Leave Act that allows eligible employees to take unpaid, job-protected leave in separate blocks of time rather than all at once. Instead of a continuous 12-week absence, you might take a few hours or days at a time for ongoing medical conditions, chronic health issues, or recurring appointments. It is one of the most underused provisions of the FMLA, partly because it is more complex for both employers and employees to administer than standard continuous leave.

The FMLA, enacted in 1993, provides up to 12 weeks of unpaid, job-protected leave per year for qualifying reasons. While most people think of FMLA leave as a single block of time away from work, intermittent leave is the version that allows you to maintain your treatment schedule without exhausting your full leave entitlement at once (U.S. Department of Labor, FMLA Guide).

Key Takeaways

• Intermittent FMLA leave lets you take FMLA-protected leave in separate blocks — hours, days, or weeks — rather than all at once.
• You must work for a covered employer and have worked 1,250 hours in the preceding 12 months to qualify.

• Qualifying reasons include serious health conditions, chronic conditions, prenatal care, and qualifying military family leave.

• Employers may require medical certification to certify the need for intermittent leave and its expected frequency.

• You are entitled to the same job protection and benefits as continuous FMLA leave.

What Is Intermittent FMLA Leave?

The Family and Medical Leave Act (FMLA) gives eligible employees up to 12 weeks of unpaid, job-protected leave per year. While continuous leave is taken in one uninterrupted block, intermittent leave is taken in separate, non-consecutive increments. This means you can take a few hours off for a chemotherapy appointment one week, a full day for physical therapy the next, and two days when your chronic condition flares up — all without using your full 12-week allotment at once.

Intermittent FMLA leave applies to both the employee’s own serious health condition and to caring for a family member with a serious health condition. It is also available for qualifying exigencies related to a family member’s military service.

The key advantage of intermittent leave is flexibility. If you have a condition that requires ongoing treatment but does not disable you full-time — such as migraines, epilepsy, cancer treatment, or physical therapy after surgery — intermittent leave lets you manage your health without disappearing from work for months.

Eligibility Requirements

To qualify for intermittent FMLA leave, you must meet the same eligibility criteria as for any FMLA leave:

1. Covered employer. Your employer must have 50 or more employees within a 75-mile radius of your worksite. This applies to most private employers with 50+ employees, all public agencies, and public and private elementary and secondary schools (29 U.S.C. § 2611(4)).
2. Tenure requirement. You must have worked for your employer for at least 12 months. This does not need to be consecutive — time with the same employer counts even if there was a break.
3. Hours requirement. You must have worked at least 1,250 hours during the 12 months immediately preceding the leave. This equates to roughly 24 hours per week over 12 months.
4. Worksite proximity. The 50-employee threshold is measured within a 75-mile radius of your worksite. If your employer has 200 employees nationwide but only 30 within 75 miles of your location, you are not eligible.

If you are a salaried employee earning above $684 per week (as of 2024), you are likely exempt from the hours requirement because FMLA regulations treat salaried exempt employees as meeting the 1,250-hour threshold automatically (29 CFR § 825.110).

Qualifying Reasons for Intermittent Leave

Intermittent FMLA leave is available for the same qualifying reasons as continuous FMLA leave:

• Serious health condition of the employee. This includes conditions requiring inpatient care, continuing treatment by a healthcare provider, or absence for more than three consecutive days with ongoing treatment. Chronic conditions that require periodic visits to a healthcare provider and may result in periodic incapacity also qualify.
• Serious health condition of a family member. You may take intermittent leave to care for a spouse, child, or parent with a serious health condition. “Parent” includes in-laws and stepparents for FMLA purposes.
• Qualifying military family leave. Under the FMLA amendments (the Veterans’ Caregiver leave provisions), you may take intermittent leave to address qualifying exigencies arising from a family member’s military service. You may also take up to 26 weeks of leave to care for a covered servicemember with a serious injury or illness.
• Prenatal care. Intermittent leave may be taken for prenatal medical appointments, regardless of whether the condition is serious.
• Bonding with a new child. Parental bonding leave must generally be taken in continuous blocks of at least two weeks, but it may be taken intermittently with the employer’s agreement. An employer may deny intermittent bonding leave if it would cause “substantial and grievous economic injury” to operations.

Chronic Conditions: The Most Common Use Case

Intermittent leave is most frequently used for chronic conditions requiring ongoing management, such as migraines (1–2 days per month), epilepsy (unpredictable recovery days), cancer treatment (weekly chemotherapy sessions plus 1–2 recovery days), Crohn’s disease (flare-ups lasting 2–5 days), and regular physical therapy appointments.

The Department of Labour has emphasised that intermittent leave for chronic conditions must be “medically necessary” — meaning the leave is required to treat the condition, not merely convenient for the employee (DOL, Fact Sheet #28, 2023).

How Intermittent Leave Is Tracked

Tracking intermittent leave is more complex than continuous leave because it involves irregular, partial-day absences. The FMLA provides several methods:

Increments of One Hour or Less

For hourly employees, employers may count intermittent leave in increments of one hour or less. You can take a 30-minute appointment as 30 minutes of FMLA leave, not a full day. This is the most common approach for medical appointments and therapy sessions.

Full-Day Increments

If you are absent for a partial day but more than half your scheduled work time, the employer may count it as a full day. However, the employer cannot round up to a full day if you are absent for less than half your scheduled time.

12-Week Equivalent

Your 12-week entitlement is calculated based on your regular work schedule. If you work 40 hours per week, 12 weeks equals 480 hours. If you take intermittent leave in hourly increments, you use 480 hours of intermittent leave before your entitlement is exhausted.

Worked Example

Maria works 40 hours per week and has a chronic migraine condition. She is approved for intermittent FMLA leave. In a given year:

• She takes 2 hours off per week for neurology appointments: 2 × 52 = 104 hours.
• She has 4 migraine episodes requiring full days off: 4 × 8 = 32 hours.
• She takes 3 additional half-days for migraine recovery: 3 × 4 = 12 hours.
• Total intermittent leave used: 148 hours. Remaining entitlement: 332 hours.

Maria retains significant leave capacity despite using intermittent leave throughout the year.

Employer Requirements

Employers have specific obligations when an employee requests intermittent FMLA leave:

1. Respond within five business days. Once the employer has enough information to determine whether the request qualifies for FMLA leave, they must notify the employee within five business days.
2. Require medical certification. Employers may require the employee to submit a medical certification from a healthcare provider that confirms the need for intermittent leave, its expected frequency and duration, and the medical facts supporting it (29 CFR § 825.306).
3. Designate the leave as FMLA. If the employer knows the leave qualifies for FMLA protection, they must designate it as such — even if the employee does not request it. The employer cannot wait for the employee to mention FMLA.
4. Maintain health benefits. The employer must continue group health insurance coverage during intermittent leave on the same terms as if the employee had been working.
5. Restore the employee. After intermittent leave, the employee must be restored to the same or an equivalent position with equivalent pay, benefits, and terms of employment.
6. Do not retaliate. Retaliating against an employee for using intermittent FMLA leave — through demotion, reduced hours, or adverse scheduling changes — violates the FMLA (29 U.S.C. § 2615).

Frequently Asked Questions

Can my employer deny my request for intermittent FMLA leave?

Your employer cannot deny FMLA leave for a qualifying reason if you are eligible. However, the employer can require medical certification to verify the need for intermittent leave. If your certification is incomplete or insufficient, the employer may request additional information. Parental bonding leave can be denied on an intermittent basis if it would cause substantial and grievous economic injury to operations.

How many hours of intermittent FMLA leave can I take per day?

There is no daily maximum. You can take as many hours as medically necessary, up to your annual entitlement of 12 weeks (480 hours for a full-time employee working 40 hours per week). Your employer may count leave in one-hour increments for hourly employees.

Does intermittent FMLA leave affect my paycheck?

FMLA leave is unpaid. Your employer is not required to pay you during intermittent leave, though they may allow you to substitute accrued paid leave (such as sick leave or vacation) to receive pay during FMLA absence. Check your employer’s leave substitution policy.

Can my employer require me to use all paid leave before using intermittent FMLA leave?

Under current FMLA regulations, employers may require employees to substitute accrued paid leave for unpaid FMLA leave. However, some state laws may provide different rules. The general practice is that employers coordinate FMLA leave with paid leave policies, but you should check your state’s specific requirements.

What happens if I exhaust my 12 weeks of intermittent FMLA leave?

Once you have used your full 12-week entitlement for the year, your employer is no longer required to provide job-protected leave under the FMLA. You may still be eligible for leave under the Americans with Disabilities Act (ADA) as a reasonable accommodation, or under state-specific leave laws. Your employer may also offer additional leave as part of company policy.

This article is general information, not legal advice. Consult a qualified employment lawyer for guidance on your specific jurisdiction and circumstances.