Do I Need an FSA? What It Covers, Limits, and Rollover Rules

You need a Flexible Spending Account if you have predictable medical or dependent care costs each year, your employer offers one, and you can estimate your annual spending closely enough to avoid leaving money on the table. The tax savings are the whole point: contributions dodge federal income tax plus the 7.65% you’d otherwise pay in Social Security and Medicare taxes.¹ Someone in the 22% bracket who contributes the full $3,400 Health Care FSA limit for 2026 keeps roughly $1,000 that would have gone to taxes.

When Signing Up Makes Sense

An FSA rewards predictability. If you take a maintenance prescription every month, wear contacts, know a family member needs orthodontia this year, or pay for daycare, you already have a floor of spending you can safely run through the account. If your medical year is unpredictable and you rarely see a doctor, the forfeiture risk (more on that below) can wipe out the tax benefit.

You also have to be eligible. FSAs sit inside employer-sponsored cafeteria plans, and federal law requires every participant to be an employee.² That means W-2 workers whose employer offers the benefit. Self-employed individuals, business partners, and 1099 contractors can’t participate. If you’re covered under your spouse’s health plan and their employer offers an FSA, your spouse’s Health Care FSA can reimburse your eligible expenses.

You elect your contribution during your employer’s annual open enrollment window. After that, you can only change the amount if you have a qualifying life event such as marriage, a birth, or losing other coverage.³ Whatever number you pick locks in for the full plan year.

What an FSA Pays For

Employers usually offer two main flavors, and sometimes a third.

Health Care FSA

This is the standard version. It covers out-of-pocket medical, dental, and vision expenses for you and your dependents: copays, deductibles, prescriptions, eyeglasses, contact lenses, fillings, orthodontia, and similar costs from the IRS list in Publication 502.⁴ Over-the-counter drugs and menstrual products qualify without a prescription. Cosmetic procedures, gym memberships without a medical necessity letter, and general wellness items like vitamins don’t.

One feature that makes the Health Care FSA especially useful for a known big expense: your entire annual election is available on day one of the plan year, even though payroll deductions accumulate gradually.⁵ Elect $3,400, need a $2,000 procedure in January, and you can use the full amount immediately.

Dependent Care FSA

This account covers the cost of caring for children under 13, or a spouse or dependent who can’t care for themselves, when the care lets you work or look for work.⁶ Eligible costs include daycare, preschool, before- and after-school programs, and summer day camps. Overnight camps don’t qualify. Unlike the Health Care FSA, this version doesn’t front-load your balance: you can only be reimbursed up to what has actually been deducted from your paychecks so far.

One trap to run before signing up: you cannot use the same dollar of childcare expense for both a Dependent Care FSA and the Child and Dependent Care Tax Credit. The IRS requires you to reduce credit-eligible expenses by any amount your employer plan excluded from income.⁷ For most two-earner families the FSA wins, but lower-income households with modest childcare bills should compare both.

Limited Purpose FSA

A Limited Purpose FSA is restricted to dental and vision expenses. It exists so employees with a Health Savings Account can still get FSA tax benefits without disqualifying themselves from HSA contributions. A general Health Care FSA and an HSA cannot coexist.⁸

2026 Contribution Limits

For plan years beginning in 2026:

Health Care FSA: $3,400 per employee, up from $3,300 in 2025.
Dependent Care FSA: $7,500 for married couples filing jointly, or $3,750 if married filing separately. That’s a significant jump from the longstanding $5,000 cap, enacted through the One Big Beautiful Bill Act signed in July 2025.⁹

Both spouses can each contribute $3,400 to their own Health Care FSAs if both employers offer the benefit. The dependent care limit, by contrast, is a household cap regardless of how many employer plans are involved.

Contributions avoid federal income tax, the 6.2% Social Security tax, and the 1.45% Medicare tax.¹⁰ The trade-off is a slightly lower Social Security earnings record, which could marginally reduce future benefits for high earners near the taxable wage base.

The Use-It-or-Lose-It Rule

This is the reason to think twice before electing a big number. Any money left in your account at the end of the plan year is forfeited unless your employer builds in one of two safety valves. Employers can offer one, but not both:

Grace period: an extra 2.5 months after the plan year ends during which you can incur new expenses against the old balance.
Carryover: unused Health Care FSA funds up to $680 for 2026 roll into the next plan year automatically.

If your plan offers neither, the balance resets to zero on the first day of the new plan year. Forfeited money stays with the employer to offset plan administration costs.

The reliable way to size your election is to add up expenses you already know you’ll have: recurring prescription copays, a scheduled dental procedure, contact lenses, standing childcare bills. Contribute that number. Cover unexpected costs out of pocket rather than guessing high and scrambling in December.

Most plans also include a run-out period, typically 90 days after the plan year ends, that gives you extra time to file claims for expenses already incurred. It doesn’t extend the deadline for new spending. Miss it and you lose reimbursement for legitimate expenses, so mark the date.

What Happens If You Leave Your Job

Your Health Care FSA access generally ends on your last day of employment, or at the end of that month depending on the plan. Any unspent balance goes back to the employer. Because of the uniform coverage rule, though, the math can run in your favor: elect $3,400 for the year, spend $3,000 by March, and leave in April, and you got more out of the account than you contributed. The employer absorbs the difference. In the other direction, if you’ve contributed $2,000 by October and only spent $500 before leaving, the remaining $1,500 is lost.

Dependent Care FSAs work differently. There’s no uniform coverage rule, so you’re only reimbursed for what you’ve actually contributed. You can keep submitting claims for eligible expenses through the end of the plan year using funds already in the account.

When an HSA Is the Better Choice

If your employer offers a high-deductible health plan with an HSA option, run that comparison before defaulting to an FSA. The two look similar and behave very differently over time.

Portability: an HSA is yours permanently and follows you between jobs and into retirement. An FSA is tied to your employer.
Rollover: HSA balances carry over indefinitely and can be invested. FSA balances mostly expire at year-end.
Contribution limits: HSAs allow $4,400 for individual coverage or $8,750 for family coverage in 2026, above the $3,400 FSA cap.¹¹
Eligibility: HSAs require enrollment in a qualifying high-deductible plan with a minimum deductible of $1,700 for individual coverage or $3,400 for family coverage in 2026. You also can’t be enrolled in Medicare or claimed as a dependent.⁸
Day-one access: Health Care FSAs give you the full elected balance on January 1. HSAs only hold what you’ve deposited so far.

For low medical spenders with a long time horizon, the HSA is usually the better vehicle because unused funds grow tax-free. For people with high, predictable expenses who want the whole balance available in January, the Health Care FSA has an edge. If you want both, a Limited Purpose FSA for dental and vision paired with an HSA for everything else combines them.⁸

If your employer doesn’t offer a high-deductible plan, or you’ve chosen a traditional PPO, the question narrows. The FSA is your only pre-tax option for medical costs, and it’s worth using for any spending you can reliably predict.

1
Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
2
Office of the Law Revision Counsel. 26 USC 125 – Cafeteria Plans
3
HealthCare.gov. Qualifying Life Event (QLE) – Glossary
4
Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
5
Internal Revenue Service. IRS Notice 2013-71 – Modification of Use-or-Lose Rule for Health FSAs
6
Internal Revenue Service. Publication 503 (2025), Child and Dependent Care Expenses
7
Internal Revenue Service. Topic No. 602, Child and Dependent Care Credit
8
Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans
9
Office of the Law Revision Counsel. 26 USC 129 – Dependent Care Assistance Programs
10
Social Security Administration. FICA and SECA Tax Rates
11
Internal Revenue Service. IRS Notice 2026-05 – HSA Contribution Limits for 2026