What Is a Flexible Spending Account (FSA)? 2026 Guide

A Flexible Spending Account (FSA) is a benefit offered by many employers that lets you set aside pre-tax dollars for medical expenses. The money you put in an FSA reduces your taxable income, which means you pay less in federal income tax, Social Security tax, and Medicare tax. If your employer offers one, an FSA is one of the simplest tax breaks available to working Americans.

How an FSA Works

At the start of the plan year, you elect how much money to contribute to your FSA — up to the IRS limit. That amount is deducted from your paycheck in equal installments throughout the year, before taxes are calculated. When you have a qualifying medical expense, you pay for it using your FSA debit card or submit a reimbursement claim. The money comes out tax-free.

One important rule: the full annual election is available on day one of the plan year, even if you have not yet contributed the full amount. If you elect $2,000 and need dental work in January, you can use all $2,000 right away — even though your payroll deductions have not caught up yet.

2026 FSA Contribution Limits

For 2026, the IRS limits health FSA contributions to $3,300 per year per employee. If your spouse also has access to an FSA through their employer, they can contribute up to $3,300 as well — the limit applies per employee, not per household. Some employers add a matching contribution on top of your election, which does not count against your limit.

What Expenses Does an FSA Cover?

Health FSAs cover a broad range of qualified medical expenses:

Doctor and specialist visit copays and deductibles
Prescription medications
Dental care (cleanings, fillings, crowns, orthodontia)
Vision care (eye exams, glasses, contact lenses)
Mental health services
Over-the-counter medications (no prescription required since 2020)
Menstrual care products
Medical equipment (blood pressure monitors, crutches, hearing aids)

Cosmetic procedures, gym memberships, and most vitamins are not covered. Check IRS Publication 502 for the full list of eligible expenses.

The Use-It-or-Lose-It Rule

FSA funds generally must be used within the plan year — unused balances are forfeited at year end. This is the biggest drawback of FSAs. However, employers may offer one of two relief options:

Rollover: Carry over up to $660 of unused funds into the next plan year (2026 IRS limit).
Grace period: An extra 2.5 months after the plan year ends to spend remaining funds.

Employers can offer one option or neither — check your benefits documentation to know your plan’s rules.

FSA vs. HSA: Key Difference

A Health Savings Account (HSA) is often confused with an FSA. The main differences:

HSA: Requires a high-deductible health plan (HDHP). Funds roll over every year indefinitely. Can be invested and grow tax-free. You own the account forever.
FSA: Available with most health plans. Subject to use-it-or-lose-it. Cannot be invested. Employer-owned; you lose access when you leave the job.

If you have access to both, you generally cannot contribute to a standard health FSA and an HSA in the same year. A limited-purpose FSA (covering only dental and vision) can be paired with an HSA.

Dependent Care FSA

Separate from the health FSA, many employers also offer a Dependent Care FSA for childcare and elder care expenses. The 2026 limit is $5,000 per household ($2,500 if married filing separately). Eligible expenses include daycare, after-school programs, summer day camps, and adult day care for dependent adults. This FSA does not cover medical expenses.

How to Maximize Your FSA

Estimate your out-of-pocket medical costs realistically. Contribute only what you expect to use.
Front-load big expenses early in the year if you can, since the full balance is available from day one.
Keep receipts for all purchases in case your employer audits your FSA claims.
In December, check your remaining balance and schedule any outstanding medical, dental, or vision appointments.

Bottom Line

An FSA is a straightforward way to cut your tax bill on expenses you are already paying. Contributing $2,000 to an FSA can save $500 or more in taxes depending on your bracket. The key is accurate planning — contribute only what you will realistically spend, and know your plan’s rollover or grace period rules before year end.