HSA vs FSA
An HSA (Health Savings Account) is yours. It belongs to you, not your employer, it requires a high-deductible health plan (HDHP), the money rolls over every year, you can invest it, and it carries a triple tax break: contributions go in pre-tax, growth is tax-free, and withdrawals for medical costs are tax-free. An FSA (Flexible Spending Account) belongs to your employer. It has no HDHP requirement, so more people can use one, but it is largely use-it-or-lose-it, you cannot invest it, and it does not follow you when you leave your job.
What is the difference between an HSA and an FSA?
Both accounts let you pay for medical costs with money that was never taxed. The difference is ownership and what happens to the money over time.
An HSA is a personal account. You open it, you own it, and it stays with you for life regardless of where you work or whether you work at all. Because you own it, unspent money simply rolls forward year after year, and once your balance clears a threshold set by your provider you can invest it in funds much like a 401(k). The catch is eligibility: you can only contribute to an HSA while you are covered by a qualifying HDHP and have no other disqualifying coverage.
An FSA is an employer benefit. Your employer sets it up, and you can only have one through a job that offers it. There is no HDHP requirement, so you can pair an FSA with almost any employer health plan. The trade-off is that the money is broadly use-it-or-lose-it. If you do not spend it within the plan year (plus any carryover or grace period your employer chooses to offer), you forfeit what is left.
HSA vs FSA: side by side
| Feature | HSA | FSA |
|---|---|---|
| Who owns the account | You | Your employer |
| Requires an HDHP | Yes | No |
| Unused money rolls over | Yes, fully, every year | Mostly no (limited carryover or grace period only if your employer offers it) |
| Portable when you change jobs | Yes, it goes with you | No, you generally forfeit it |
| Can you invest the balance | Yes | No |
| 2026 contribution limit | $4,400 self-only / $8,750 family | $3,400 (employee salary reduction) |
| 2026 catch-up (age 55+) | Extra $1,000 | Not applicable |
Source: IRS Rev. Proc. 2025-19 (HSA/HDHP), Rev. Proc. 2025-32 (FSA), and IRS Publication 969.
What are the 2026 HSA and FSA limits?
For 2026 the IRS set HSA contribution limits at $4,400 for self-only HDHP coverage and $8,750 for family HDHP coverage. If you are 55 or older you can add a $1,000 catch-up contribution on top. These figures come from IRS Revenue Procedure 2025-19.
To contribute to an HSA in 2026 your HDHP must have a deductible of at least $1,700 for self-only coverage or $3,400 for family coverage, and its out-of-pocket maximum cannot exceed $8,500 self-only or $17,000 family. If your plan falls outside those bounds, it is not a qualifying HDHP and you cannot contribute.
For 2026 the health FSA employee salary-reduction limit is $3,400. If your employer allows carryover, the most you can carry into the next plan year is $680. These figures come from IRS Revenue Procedure 2025-32. Carryover is optional: your employer may offer it, may offer a grace period of up to two and a half extra months instead, or may offer neither. It cannot offer both.
Which is better, an HSA or an FSA?
Neither is universally better. The right account depends on which health plan you have and how you like to manage money.
An HSA is the stronger long-term account. Because the money is yours, rolls over, and can be invested, many people treat an HSA as a stealth retirement account for medical costs, letting the balance grow for years. You can only get that if you are enrolled in a qualifying HDHP, which typically means a lower premium but a higher deductible, so you shoulder more upfront cost before insurance kicks in.
An FSA is the more accessible account. There is no HDHP requirement, so you can use one with a traditional plan that has a low deductible. It works best when you already know roughly what you will spend in a year, for example on prescriptions, dental work, or planned procedures, because you want to spend most of the balance before the deadline.
A simple way to decide: if you have an HDHP and can afford to leave the money invested, favor the HSA. If you have a traditional plan and predictable near-term medical costs, the FSA is often your only tax-advantaged option, and a useful one.
Can I have both an HSA and an FSA at the same time?
Usually not in the way people expect. A standard general-purpose health FSA counts as disqualifying coverage for HSA purposes, which means having one blocks you from contributing to an HSA.
There is one common exception. A limited-purpose FSA, which covers only dental and vision expenses, does not disqualify you. Many employers that offer an HDHP with an HSA also offer a limited-purpose FSA so you can set aside extra pre-tax money for dental and vision while still contributing to your HSA. A post-deductible FSA works similarly. So the honest answer is: you cannot combine an HSA with a normal FSA, but you can pair an HSA with a limited-purpose FSA.
Sources
- HSA rules (ownership, rollover, portability, HDHP requirement, disqualifying coverage, limited-purpose FSA, age-55 catch-up): IRS Publication 969.
- 2026 HSA contribution limits and HDHP thresholds: IRS Revenue Procedure 2025-19 (PDF).
- 2026 health FSA salary-reduction limit ($3,400) and maximum carryover ($680): IRS, 2026 inflation adjustments (Rev. Proc. 2025-32).