HSA and FSA are not the same, though they both let you set aside pre-tax money for medical costs
An HSA (Health Savings Account) and an FSA (Flexible Spending Account) both reduce your taxable income when you contribute to them, and both let you pay medical bills without income tax on that money. But they work differently, have different rules about who can open one, and treat unused money in opposite ways. The choice between them depends on your health plan and how much you expect to spend.
The biggest practical difference: FSA money disappears at the end of the year if you don't use it (with a small carryover in some plans), while HSA money stays in your account forever and can grow like a retirement fund. That makes an HSA more flexible for long-term planning, but an FSA can make sense if you know you'll spend the money within twelve months.
Key Takeaways
- An HSA requires a high-deductible health plan; an FSA works with any health plan your employer offers.
- FSA money you don't spend by the end of the plan year is forfeited (though some employers allow a small carryover or grace period).
- HSA money rolls over indefinitely and can be invested, making it useful for saving toward future medical costs or retirement.
- You can contribute to an FSA through your employer only; HSAs can be opened through your employer or on your own if you have a may have access to health plan.
Who can open each account
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 cannot have other health coverage at the same time, and you cannot be claimed as a dependent on someone else's tax return. If your employer offers an HSA, you can open one through them, but you can also open one independently through a bank or investment firm.
An FSA is only available through your employer's benefits plan. You enroll during open enrollment or when you first become may be able to access for benefits. There is no requirement to have a specific type of health plan — you can use an FSA with any plan your employer offers, including a standard PPO or HMO. You cannot open an FSA on your own.
What happens to money you don't spend
This is where the two accounts diverge most sharply. FSA contributions follow a "use it or lose it" rule: any money left in your account at the end of the plan year (usually December 31) is forfeited and goes back to your employer. Some employers allow a grace period of up to 2.5 months into the next year, or a carryover of up to $610 (in 2024), but this is optional — check your plan documents to see what your employer offers.
HSA money never expires. Whatever you contribute stays in the account, and you can withdraw it tax-free for medical costs whenever you need to — this year, next year, or thirty years from now. If you don't withdraw it, it can sit there and grow through investment, much like a retirement account. Some people use HSAs as a secondary retirement savings tool because after age 65, you can withdraw money for any reason (though non-medical withdrawals are taxed as income).
Contribution limits and employer involvement
For 2024, you can contribute up to $4,150 to an HSA if you have individual coverage, or $8,300 for family coverage. If you're 55 or older, you can add an extra $1,000 catch-up contribution. These limits are set by the IRS and change yearly. Your employer may contribute to your HSA as well, and those contributions count toward your limit.
FSA contribution limits are lower: $3,300 per year in 2024 for a general-purpose FSA (used for medical, dental, and vision costs). Some employers offer a separate dependent care FSA with its own $5,000 limit. Unlike an HSA, your employer does not typically contribute to your FSA — you fund it entirely through payroll deductions.
Which medical costs you can cover
Both accounts can pay for the same range of medical expenses: doctor visits, prescriptions, dental work, vision care, mental health treatment, and many over-the-counter items (though the rules on OTC products changed in 2020 and now require a prescription). You can use either account to pay deductibles, copays, and coinsurance.
The IRS publishes a detailed list of may have access to medical costs, and both HSAs and FSAs follow the same list. The difference is not what you can buy, but what you do with leftover money — and whether you can keep the account if you change jobs or retire.
Portability when you change jobs
If you leave your job, your FSA ends. You have a limited window (usually 60 days) to spend the money that remains, and anything left after that is forfeited. You cannot transfer an FSA to a new employer's plan or keep it open on your own.
An HSA belongs to you, not your employer. If you leave your job, the account stays open and the money remains yours. You can continue to use it, invest it, or let it grow. If your new employer offers an HSA, you can keep your old one or open a new one — you just cannot contribute to more than one HSA at a time.
When to choose an FSA over an HSA
An FSA makes sense if you have predictable medical costs you know you'll incur within the next twelve months — ongoing prescriptions, planned dental work, regular therapy sessions, or frequent vision care. If you can spend the full amount you contribute, the FSA's lower contribution limit is not a drawback, and you get the tax benefit without worrying about money rolling over unused.
An FSA is also your only option if your employer does not offer a high-deductible health plan, or if you have other health coverage (like a spouse's plan) that would disqualify you from an HSA. Some people use both: they enroll in an HSA through a high-deductible plan and also contribute to a dependent care FSA for childcare costs.
When to choose an HSA over an FSA
An HSA is the better choice if you want to save for future medical costs, have the flexibility to use the money across multiple years, or want to invest the balance. Because HSA money never expires and belongs to you, it works well for people who are generally healthy and do not expect to spend the full contribution each year.
An HSA also makes sense if you might change jobs, retire early, or want to build a medical fund for later in life. The account is portable, so you keep it even if you leave your employer. And after age 65, you can withdraw HSA money for any reason, making it a useful supplemental retirement account.
Frequently Asked Questions
Can I have both an HSA and an FSA at the same time?
You can have an HSA and a dependent care FSA at the same time, because they cover different things. You cannot have an HSA and a general-purpose medical FSA together — the IRS treats them as overlapping coverage. Check your employer's plan to see what combinations they offer.
What if I don't spend all my FSA money by the end of the year?
It depends on your employer's plan. Most FSAs follow a strict use-it-or-lose-it rule, and unused money is forfeited. Some employers allow a grace period (up to 2.5 months into the next year) or a carryover of up to $610. Review your plan documents or ask your benefits administrator what your plan allows.
Can I withdraw HSA money for non-medical costs?
Before age 65, withdrawals for non-medical costs are taxed as income and subject to a 20% penalty. After age 65, you can withdraw money for any reason without the penalty, though non-medical withdrawals are still taxed as income. This makes an HSA useful as a retirement savings tool.
What happens to my FSA if I quit my job mid-year?
Your FSA ends when your employment ends. You typically have 60 days to submit claims for costs you incurred while enrolled. Any remaining balance is forfeited and does not transfer to your new employer's plan.
Do I need to submit receipts to use HSA or FSA money?
Most HSAs and FSAs issue debit cards that you can use at pharmacies and medical providers. For other costs, you may need to submit a receipt or claim form. Keep records of all medical expenses in case your account administrator asks for proof that the cost was may have access to.