HSA vs. FSA: How the Two Health Accounts Differ
An HSA and an FSA both set aside pre-tax money for medical costs, but one belongs to you and rolls over forever while the other belongs to your employer and can expire. Here is how each works and which one fits your situation.
Every fall, millions of American workers see the same two acronyms on their open-enrollment forms: HSA and FSA. Both accounts let you pay for medical costs with pre-tax money, and both cover the same kinds of expenses under IRS rules. But they are built for different situations. The HSA is a personal account that stays with you and never expires. The FSA is tied to your employer and, in most cases, to the calendar.
How an HSA works
A health savings account is available only to people enrolled in a high-deductible health plan, or HDHP, that meets IRS minimums. For 2026, the IRS requires a minimum deductible of $1,700 for self-only coverage or $3,400 for family coverage (Rev. Proc. 2025-19). These figures are adjusted for inflation every year.
Money goes in before tax, grows free of tax, and comes out free of tax when spent on qualified medical expenses such as deductibles, copays, prescriptions, dental work, and vision care. Contributions for 2026 are capped at $4,400 for self-only coverage and $8,750 for family coverage, with an extra $1,000 catch-up contribution for people 55 and older. The catch-up amount is fixed by law and does not change with inflation.
The defining feature of the HSA is that it belongs to you. The balance rolls over every year, follows you from job to job, and many plans let you invest the money once the balance passes a threshold. Withdrawals for non-medical spending before age 65 are taxed and face a 20 percent additional tax; after 65, that extra tax goes away and non-medical withdrawals are simply taxed as income.
How an FSA works
A health flexible spending account is offered through your employer and does not require a high-deductible plan. You decide during open enrollment how much of your paycheck to set aside, and the money comes out before taxes. For plan years beginning in 2026, the IRS caps employee contributions at $3,400 (Rev. Proc. 2025-32).
Two practical differences set the FSA apart. First, the account belongs to your employer, not to you: if you leave the job, you generally leave the money behind. Second, the FSA runs on a use-or-lose rule. Unspent money at the end of the plan year is forfeited, though your employer may offer one of two cushions: a grace period of up to 2½ months to spend the remainder, or a carryover of up to $680 into the next year. Employers may offer one or the other, not both.
The FSA has one advantage early in the year: the full amount you elected is available on the first day of the plan year, before all of it has been deducted from your paychecks.
HSA vs. FSA: side by side
| What it is | A personal tax-advantaged account for medical costs | An employer-sponsored account for medical costs |
| Who qualifies | Workers enrolled in a qualifying HDHP; no Medicare enrollment and no other disqualifying coverage | Workers whose employer offers one; works with most plan types |
| Costs and limits | 2026: $4,400 self-only / $8,750 family, plus $1,000 catch-up at 55+ | 2026: $3,400 in employee contributions |
| Pros | Tax break on the way in, on growth, and on medical withdrawals; portable; can invest; no deadline to spend | No HDHP required; full election available on day one; pre-tax |
| Cons | Requires a high-deductible plan; 20 percent extra tax on non-medical withdrawals before 65 | Use-or-lose; tied to the employer; no investing |
Verdict: which one fits
Choose the HSA if you are enrolled in a qualifying high-deductible plan and want the money to keep working for you. The rollover and portability make it the better fit for people who change jobs, expect low medical spending in a given year, or want to build a medical-expense fund that lasts decades. The trade-off is the high deductible itself: you pay more out of pocket before insurance starts paying.
Choose the FSA if your employer offers one and you have predictable medical, dental, or vision costs this year. It works with PPOs and HMOs, needs no high deductible, and the full elected amount is there on day one. The trade-off is the deadline: plan your spending, because unspent money usually disappears.
One combination is allowed: workers with an HSA can also hold a limited-purpose FSA restricted to dental and vision expenses.
Explainer based on program rules published by the Internal Revenue Service, including Publication 969, Revenue Procedure 2025-19 (2026 HSA figures), and Revenue Procedure 2025-32 (2026 health FSA figures). Contribution limits and carryover amounts change annually.
