FSA vs. HSA: How These Two Tax-Advantaged Accounts Work Differently

The Core Difference Between FSA and HSA

An FSA (Flexible Spending Account) and an HSA (Health Savings Account) are both tax-advantaged accounts that let you set aside pre-tax money for medical expenses. The key difference is who can open one and what happens to unused money.

An FSA is offered only through your employer's benefits plan. You contribute money before taxes are taken out of your paycheck, and you can spend it on may be able to access medical expenses during that plan year. Money you don't spend by the end of the year is forfeited — you lose it. An HSA, by contrast, is a personal account you own and control, available only if you have a high-deductible health plan (HDHP). Unused money rolls over year to year and grows tax-free, and you can withdraw it for any reason after age 65.

Because an HSA lets you keep and invest unused money indefinitely, it functions as a retirement savings tool in addition to a medical expense account. An FSA is purely a spending account for the current year.

Key Takeaways

• FSAs are employer-sponsored and require you to spend the money within the plan year or lose it, while HSAs are personal accounts you own that let unused money roll over indefinitely.
• You can only open an HSA if you are enrolled in a high-deductible health plan (HDHP), but FSAs are available through most employer plans regardless of your health insurance type.
• Both accounts use pre-tax contributions to reduce your taxable income, but HSAs also allow tax-free investment growth on unused balances.
• FSA contribution limits are set by your employer (up to $3,300 per year in 2024), while HSA limits depend on your coverage type and are set by the IRS (individual coverage up to $4,150 in 2024).
• Both accounts cover the same may be able to access medical expenses: copays, deductibles, prescriptions, dental work, vision care, and many other out-of-pocket health costs.

How FSA Contributions and Spending Work

When you enroll in an FSA during your employer's open enrollment period, you decide how much to contribute for the upcoming plan year. Your employer deducts that amount from your paychecks before income taxes and payroll taxes are calculated, which lowers your taxable income. You then receive a debit card or reimbursement forms to spend the money on may be able to access medical expenses.

The critical rule is the use-it-or-lose-it provision. Any money remaining in your FSA account at the end of the plan year is forfeited. Your employer keeps it. Some plans offer a grace period (usually 2.5 months into the next year) to spend remaining funds, and a few allow you to carry over up to $640 into the next year, but most do not. This means you need to estimate carefully how much medical spending you will actually have.

FSA funds can be used for copays, coinsurance, deductibles, prescription medications, dental work, vision care, hearing aids, crutches, and dozens of other medical items and services. The IRS publishes a full list of may be able to access expenses. You cannot use FSA money for health insurance premiums, over-the-counter medications (unless prescribed), or cosmetic procedures.

How HSA Contributions and Spending Work

To open an HSA, you must be enrolled in a high-deductible health plan (HDHP). The IRS defines an HDHP as a plan with a deductible of at least $1,600 for individual coverage or $3,200 for family coverage in 2024. You can open an HSA through your employer, a bank, or a financial institution — you own the account regardless of where it is held.

You contribute money to your HSA on a pre-tax basis, either through payroll deductions (if your employer offers it) or by making direct contributions and deducting them on your tax return. Unlike an FSA, you are not required to spend the money in any particular year. Unused balances roll over automatically, and you can invest the money in mutual funds or other securities to grow it over time.

You can withdraw HSA funds for any may be able to access medical expense at any time, tax-free. After age 65, you can withdraw money for any reason without penalty (though non-medical withdrawals are taxed as ordinary income). This makes an HSA a powerful long-term savings tool — many people use it as a supplemental retirement account by paying medical expenses out of pocket and letting HSA funds grow untouched.

Contribution Limits and Tax Savings

FSA contribution limits are set by your employer but capped by the IRS. For 2024, the maximum is $3,300 per year. Your employer may set a lower limit. You choose your contribution amount during open enrollment, and it remains fixed for the entire plan year unless you have a may have access to life event (marriage, birth, loss of coverage).

HSA contribution limits depend on your coverage type. For 2024, the limit is $4,150 for individual coverage and $8,300 for family coverage. If you are age 55 or older, you can contribute an additional $1,000 per year. Unlike an FSA, you can change your HSA contribution amount at any time, and you can contribute for the prior year until the tax filing deadline.

Both accounts reduce your taxable income dollar-for-dollar. If you contribute $2,500 to an FSA and earn $50,000 per year, your taxable income drops to $47,500. The tax savings depend on your tax bracket — someone in the 22% federal bracket saves $550 in federal taxes alone, plus state and payroll taxes. An HSA offers the same upfront tax deduction, plus the additional benefit of tax-free growth on invested balances.

may be able to access: Who Can Open Each Account

FSA may be able to access is straightforward: your employer must offer one. Most large employers and many mid-size employers do. You enroll during open enrollment, and coverage begins on your plan's start date. You do not need to meet any health requirements — anyone on the employer's health plan can participate.

HSA may be able to access has one strict requirement: you must be enrolled in a high-deductible health plan. You cannot have other health coverage (with limited exceptions for vision, dental, and accident plans). You cannot be claimed as a dependent on someone else's tax return. You cannot be enrolled in Medicare. If you meet these conditions, you can open an HSA at any time during the year, not just during open enrollment.

Some people have access to both an FSA and an HSA if their employer offers both and they enroll in an HDHP. However, if you have an FSA, you cannot contribute to an HSA in the same year — the IRS treats this as double-dipping on tax benefits. You would need to stop contributing to the FSA first.

What Happens When You Leave Your Job

When you leave your employer, your FSA coverage ends on your last day of employment or on your plan's end date, whichever comes first. You have a limited window (usually 60 to 90 days) to submit claims for expenses you incurred while the account was active. Any remaining balance is forfeited. You cannot transfer an FSA to a new employer or convert it to a personal account.

An HSA travels with you. You own it personally, so it remains yours regardless of employment changes. You can continue to use it, invest it, and withdraw from it for the rest of your life. If your new employer offers an HSA, you can continue contributing to your existing account or open a new one. If your new employer does not offer an HSA but you remain on an HDHP, you can still contribute to your personal HSA.

This portability is one of the strongest advantages of an HSA for long-term planning. An FSA is purely a current-year benefit tied to your employment.

may be able to access Medical Expenses: What Both Accounts Cover

FSAs and HSAs cover the same list of may be able to access medical expenses. Both can be used for copays, coinsurance, deductibles, prescription medications, dental work (fillings, crowns, orthodontics), vision care (glasses, contacts, exams), hearing aids, crutches, wheelchairs, and many other items. Both can cover mental health services, physical therapy, and preventive care.

Both accounts explicitly exclude health insurance premiums (with narrow exceptions for COBRA, Medicare, and long-term care insurance). Both exclude over-the-counter medications unless they are prescribed by a doctor. Both exclude cosmetic procedures, gym memberships, and general wellness products.

The IRS maintains a searchable database of may be able to access expenses on its website. If you are unsure whether a specific item qualifies, you can look it up there or ask your account administrator before spending the money. Spending on ineligible expenses means you pay out of pocket with no tax benefit.

Frequently Asked Questions

Can I have both an FSA and an HSA at the same time?

Not in the same year. If you have an FSA, you cannot contribute to an HSA during that plan year. However, you can stop contributing to an FSA and start contributing to an HSA in a later year. Some people use an FSA while employed and switch to an HSA when they move to a job with an HDHP.

What happens to my FSA money if I don't spend it?

It is forfeited at the end of the plan year. Your employer keeps it. Some plans offer a grace period (usually 2.5 months into the next year) or allow you to carry over up to $640, but most do not. This is why estimating your medical expenses carefully is important when you enroll.

Can I use my HSA for my spouse's medical expenses?

Yes. HSA funds can be used for medical expenses of you, your spouse, and any dependents you claim on your tax return, regardless of whether they are on your health plan. FSA rules vary by plan, but most allow the same flexibility.

What if I withdraw HSA money for something that is not a medical expense?

Before age 65, non-medical withdrawals are subject to income tax plus a 20% penalty. After age 65, you can withdraw for any reason without penalty, but non-medical withdrawals are taxed as ordinary income. This is why an HSA becomes more flexible in retirement.

Can I invest my FSA or HSA money?

FSA funds are typically held in a cash account and cannot be invested. HSA funds can be invested in mutual funds, stocks, and other securities through most HSA providers. This investment option is one reason an HSA can grow significantly over time if you do not spend the money immediately.