The core HSA vs FSA difference is who can have one and who owns the balance. A health savings account (HSA) requires coverage under a qualifying high deductible health plan, and IRS Publication 969 states that an HSA "stays with you if you change employers or leave the work force." A health flexible spending arrangement (FSA) is set up by an employer, does not require a high deductible plan, and generally follows a use-it-or-lose-it rule, softened only if the employer's plan adopts a carryover or grace period. Both pay qualified medical expenses with untaxed dollars. Almost everything else about them differs.
This article explains two US tax-favored accounts as the IRS describes them. It is general information, not tax, financial or benefits advice, and it does not say which account anyone should use or how much to put in. A CPA or enrolled agent, and your employer's benefits administrator, are the people for questions about your own situation.
Sources read September 11, 2026. Contribution limits change every year. Every figure below names its tax year and the IRS document it comes from.
The HSA vs FSA difference in one table
| Question | HSA | Health FSA |
|---|---|---|
| Who can have one | A person covered by a qualifying high deductible health plan (HDHP), with no disqualifying other coverage, not enrolled in Medicare and not claimed as someone's dependent (IRS Publication 969) | An employee whose employer offers one through a cafeteria plan |
| Who owns the account | The individual. Pub 969: the HSA is "portable" | The employer's plan. Access is set by the plan's terms |
| Unused money at year end | "The contributions remain in your account until you use them" (Pub 969) | Use-it-or-lose-it, unless the plan permits a carryover or a grace period |
| Money available up front | Only what has been deposited | The full annual election, from the start of the coverage period (the uniform coverage rule) |
| 2026 contribution limit | $4,400 self-only, $8,750 family (IRS Rev. Proc. 2025-19) | $3,400 salary reduction limit (IRS release IR-2025-103) |
| Earnings | "The interest or other earnings on the assets in the account are tax free" (Pub 969) | Not an account that earns; it is a reimbursement arrangement |
| Needs an HDHP | Yes | No |
The rest of this article takes each row in turn.
Eligibility: the account follows the health plan, or the job
An HSA's gate is the health plan. IRS Publication 969 (2025), read September 11, 2026, lists four conditions for an "eligible individual": coverage under an HDHP on the first day of the month, no other disqualifying health coverage, no Medicare enrollment, and not being claimed as a dependent on someone else's return. On Medicare, the publication is direct: "Beginning with the first month you are enrolled in Medicare, your contribution limit is zero."
What counts as an HDHP is a tax definition with its own dollar thresholds each year. The plan design behind it, a lower premium in exchange for a higher deductible, is covered in our explainer on the low premium, high deductible trade-off.
A health FSA's gate is the employer. If the employer's cafeteria plan offers one, an employee can elect it regardless of which medical plan they chose, or whether they chose one at all. No HDHP is required.
Ownership: the question that matters on the day a job ends
This is the row with the largest practical consequence, and it is the one most comparison pages give a single line.
An HSA belongs to the individual. Pub 969 says it "stays with you if you change employers or leave the work force." Money an employer contributed, once deposited, is in the individual's account. A job change does not move or reset it.
A health FSA is part of the employer's benefit plan. What happens to an unspent election when employment ends is set by that plan's terms, and the plan's summary or the benefits administrator is where the answer lives. The IRS publication describes the general use-it-or-lose-it structure; it does not promise any employee a balance to take away.
Rollover: "remains in your account" versus "use it or lose it"
For an HSA, Pub 969 is plain: "The contributions remain in your account until you use them." There is no annual deadline to spend it.
For a health FSA, the default is that an unused election is forfeited at the end of the plan year. The IRS allows an employer to soften this in one of two ways, if the employer chooses to:
- A carryover. Unused money up to a capped amount moves into the next plan year. For tax years beginning in 2026, the IRS states in release IR-2025-103, dated October 9, 2025 and read September 11, 2026: "For cafeteria plans that permit the carryover of unused amounts, the maximum carryover amount is $680."
- A grace period. A short window after the plan year ends during which remaining money can still be used for expenses.
Whether either exists is the employer's decision. The plan's summary states which one applies, if any.
Money available up front: the FSA's one structural advantage
The FSA has a feature the HSA does not. Pub 969 describes the uniform coverage rule: "You must be able to receive the maximum amount of reimbursement (the amount you have elected to contribute for the year) at any time during the coverage period, regardless of the amount you have actually contributed."
In plain terms, an employee who elects a figure for the year can be reimbursed for that full figure in the first month, before most of it has come out of their pay. An HSA works the other way: it can only pay out what has already been deposited.
This is the honest concession in any HSA vs FSA comparison. The account with portability and rollover is also the one that cannot front the money.
Contribution limits, with the year and the document
These figures change every year. Each one below is quoted from the IRS document named, read on irs.gov on September 11, 2026.
| Figure | 2026 | 2027 | IRS source |
|---|---|---|---|
| HSA limit, self-only coverage | $4,400 | $4,500 | Rev. Proc. 2025-19 (2026); Rev. Proc. 2026-24 (2027) |
| HSA limit, family coverage | $8,750 | $9,000 | Same |
| HSA additional contribution at age 55 or older | $1,000 | Not restated here | IRS Publication 969 (2025) |
| Health FSA salary reduction limit | $3,400 | Not yet read on irs.gov | IR-2025-103, October 9, 2025 |
| Health FSA maximum carryover | $680 | Not yet read on irs.gov | IR-2025-103, October 9, 2025 |
The IRS publishes the HSA figures and the FSA figures in different documents at different times of year. The most recent FSA release we read on irs.gov covers tax year 2026, so no 2027 FSA figure is stated here. The current figures are always on irs.gov, and Publication 969 is updated for each tax year.
An employer's own FSA limit can be lower than the IRS maximum. The IRS number is a ceiling, not a promise.
What each account pays for
Both accounts pay qualified medical expenses, and both cover the same people in the household. Pub 969 states that qualified medical expenses include those incurred by "the spouse of the individual, and any dependent of the individual."
In practice, both are commonly used for the costs a health plan leaves to the member: the deductible, copayments and coinsurance. How those costs arise in sequence is set out in our guide to how a deductible and coinsurance work, and the difference between the two cost-sharing types is in our comparison of copay vs coinsurance.
One difference in what an HSA can pay: premiums. Pub 969 states: "You may not use HSA funds to pay for insurance, except for" a short list, which the publication gives as long-term care insurance, COBRA continuation coverage, health coverage while receiving unemployment compensation, and Medicare for people 65 or older. HealthCare.gov's glossary puts the general rule briefly: "HSA funds generally may not be used to pay premiums."
Can a person have both?
Sometimes, and the detail matters. A general-purpose health FSA that reimburses ordinary medical expenses counts as other coverage that can make a person ineligible to contribute to an HSA. Pub 969 describes an exception: a "limited-purpose health FSA or HRA" that covers only certain benefits, such as preventive care, does not disqualify HSA contributions. Whether an employer offers the limited-purpose version is, again, the employer's decision.
Where the HSA leaves health coverage behind
An HSA has one further feature that no FSA has: it is not tied to the plan year at all. Because the money stays and can earn, the HSA behaves more like a long-term account than a spending arrangement. That is also why the tax treatment deserves its own explanation, which covers the three separate tax layers the IRS describes and what breaks each one. Which expenses count toward the plan's annual cap, and which do not, is a separate question covered in our explainer on what counts toward your out-of-pocket maximum.
Who can answer the question for your own situation
The benefits administrator named in the plan's summary, for whether an FSA is offered, whether it has a carryover or grace period, and what happens to it when employment ends. The HSA custodian, for account-level questions. A CPA or enrolled agent, for how contributions and distributions are reported on a return. The IRS publishes the rules in Publication 969. What a professional needs from you: the plan's summary of benefits, the HSA custodian's statements and Form W-2 showing any pre-tax contributions.
Frequently asked questions
What is the main difference between an HSA and an FSA?
An HSA requires a qualifying high deductible health plan and is owned by the individual; IRS Publication 969 says it "stays with you if you change employers." A health FSA is offered through an employer, needs no HDHP, and generally follows a use-it-or-lose-it rule unless the plan adopts a carryover or grace period.
Does HSA money roll over every year?
Yes. Pub 969 states that "the contributions remain in your account until you use them."
How much can go into an HSA or FSA in 2026?
For 2026, IRS Rev. Proc. 2025-19 sets the HSA limit at $4,400 for self-only coverage and $8,750 for family coverage. IRS release IR-2025-103 sets the 2026 health FSA salary reduction limit at $3,400.
Can I have an HSA and an FSA at the same time?
Only in certain arrangements. A general-purpose health FSA generally blocks HSA contributions, but Pub 969 describes a limited-purpose health FSA that does not.
Sources, all read on irs.gov and healthcare.gov September 11, 2026: IRS Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans. IRS Rev. Proc. 2025-19, Internal Revenue Bulletin 2025-21, May 19, 2025 (2026 HSA figures). IRS Rev. Proc. 2026-24, Internal Revenue Bulletin 2026-25, June 15, 2026 (2027 HSA figures). IRS news release IR-2025-103, October 9, 2025 (2026 health FSA figures). HealthCare.gov glossary, "Health Savings Account (HSA)," no date shown.