FSA vs. HSA: Key Differences That Affect Your Savings
No, an FSA and an HSA are separate accounts with different rules
A Flexible Spending Account (FSA) and a Health Savings Account (HSA) both let you set aside pre-tax money for medical expenses, but they work differently and have different limits, rules about what happens to unused money, and who can open one.
The biggest difference: money in an FSA that you don't spend by the end of the plan year is forfeited (with a small carryover option in some plans). Money in an HSA rolls over indefinitely and grows like an investment account. An HSA also requires you to be enrolled in a high-deductible health plan; an FSA does not.
If your employer offers both, you cannot have both open at the same time — the IRS treats them as mutually exclusive. You choose one or the other based on your health spending patterns and whether you have access to a may have access to health plan.
Key Takeaways
- FSA money expires at the end of the plan year (with a possible $610 carryover in 2024), while HSA money never expires and can be invested for growth.
- An HSA requires enrollment in a high-deductible health plan; an FSA can be paired with any health insurance type.
- FSA contribution limits are set by your employer (up to $3,200 in 2024); HSA limits are higher and set by the IRS ($4,150 for individual coverage in 2024).
- You can only have one account open at a time if your employer offers both, so the choice depends on whether you expect to spend all the money you set aside.
- Both accounts reduce your taxable income and let you pay medical bills with pre-tax dollars, but the rules about withdrawals and unused balances differ significantly.
How the use-it-or-lose-it rule works differently
An FSA operates on a calendar-year or plan-year basis. Money you contribute must be spent on may be able to access medical expenses during that year. Any balance remaining on December 31 (or your plan year end) is forfeited — you lose it.
Most employers now offer a limited carryover: you can roll up to $610 (in 2024) into the next year. Some plans offer a grace period of up to 2.5 months into the following year to spend the previous year's balance. But if your plan has neither, unspent money is gone.
An HSA has no expiration. Money you contribute stays in the account year after year. If you don't spend it, it remains available indefinitely. Many people treat an HSA like a retirement account, investing the balance and letting it grow tax-free.
This difference shapes the decision: if you know you'll have significant medical expenses, an FSA's higher contribution limit (set by your employer, up to $3,200 in 2024) makes sense. If you're healthy and want to save for future medical costs, an HSA's rollover feature and investment option are more valuable.
may be able to access and health plan requirements
To open an HSA, you must be enrolled in a high-deductible health plan (HDHP) — a plan with a deductible of at least $1,600 for individual coverage or $3,200 for family coverage in 2024. You also cannot be claimed as a dependent on someone else's tax return, and you cannot be enrolled in Medicare.
An FSA has no health plan requirement. You can have an FSA with any type of health insurance — a PPO, HMO, or even a high-deductible plan. Your employer decides whether to offer an FSA and sets the contribution limit (up to $3,200 in 2024).
If your employer offers both accounts, you must choose one. The IRS does not allow you to contribute to both in the same year, except in rare cases where you change jobs or life circumstances mid-year.
Contribution limits and tax savings
| Account Type | 2024 Limit (Individual) | 2024 Limit (Family) | Who Sets the Limit |
|---|---|---|---|
| FSA | Up to $3,200 (employer decides) | Up to $3,200 (employer decides) | Your employer |
| HSA | $4,150 | $8,300 | IRS |
Both accounts reduce your taxable income. Money you contribute comes out of your paycheck before taxes, so you pay no federal income tax, Social Security tax, or Medicare tax on that money. If your state has an income tax, most states also exempt FSA and HSA contributions.
An HSA offers a tax advantage an FSA does not: you can withdraw money for non-medical expenses after age 65 without penalty (though you'll owe income tax on the withdrawal). An FSA has no such provision — non-medical withdrawals are always taxed and penalized.
What counts as an may be able to access medical expense
Both accounts cover the same range of may be able to access medical expenses: doctor visits, prescriptions, dental work, vision care, mental health treatment, and medical equipment. The IRS publishes a detailed list, and both account types follow it.
Over-the-counter medications are may be able to access only if you have a prescription. Cosmetic procedures, gym memberships, and vitamins are not may be able to access. If you're unsure whether an expense qualifies, your plan administrator can tell you before you spend the money.
One practical difference: HSA providers often offer a debit card that works at pharmacies and medical offices, making it easier to spend the money on the spot. FSA debit cards exist but are less common. Many FSA users submit receipts for reimbursement instead.
Portability and what happens when you leave your job
An FSA is tied to your employer. When you leave your job, you lose access to the account. You have a limited window (usually 60 days) to spend any remaining balance through COBRA continuation coverage, or the money is forfeited. Some employers allow you to submit claims for expenses incurred before you left, even if you submit them after departure.
An HSA belongs to you, not your employer. When you leave your job, the account stays with you. You can take it to a new employer, move it to a different HSA provider, or keep it where it is. The money is always yours.
This portability is one reason an HSA can function as a long-term savings tool. You can accumulate balances over years and decades, invest the money, and carry it into retirement. An FSA, by contrast, is designed for year-to-year spending.
Which account makes sense for your situation
Choose an FSA if you have predictable, significant medical expenses each year and your employer sets a high contribution limit. An FSA is useful for people with ongoing prescriptions, regular therapy, or planned procedures who know they'll spend the money.
Choose an HSA if you're enrolled in a high-deductible health plan, expect lower medical spending, and want to build a reserve for future healthcare costs. An HSA is also better if you think you might change jobs, because you keep the account and the money.
If your employer offers both and you're unsure, consider your health spending over the past three years. If you spent more than $2,000 on medical expenses annually, an FSA's higher employer-set limit might serve you better. If you spent less, an HSA's rollover feature and investment potential offer more value.
Frequently Asked Questions
Can I have an FSA and an HSA at the same time?
No. The IRS does not allow you to contribute to both in the same year. If your employer offers both, you must choose one during open enrollment. The only exception is if you change jobs or have a may have access to life event mid-year, which may allow you to switch accounts.
What happens to my FSA money if I don't spend it?
It is forfeited at the end of the plan year. Most employers now offer a carryover of up to $610 (in 2024) or a grace period of up to 2.5 months into the next year to spend the previous year's balance. Check your plan documents to see which option your employer provides.
Can I withdraw HSA money for non-medical expenses?
Yes, but only after age 65, and you'll owe income tax on the withdrawal (no penalty). Before age 65, non-medical withdrawals are taxed and subject to a 20% penalty. This makes an HSA useful as a retirement account if you don't need the money for medical expenses.
Do I need a high-deductible health plan to open an FSA?
No. An FSA works with any health insurance type. An HSA requires a high-deductible health plan with a deductible of at least $1,600 for individual coverage or $3,200 for family coverage in 2024.
What happens to my HSA if I change jobs?
Your HSA stays with you. You own the account and the money in it. You can keep it with your current provider, move it to a new provider, or transfer it to your new employer's HSA plan if they offer one.