HSA vs FSA
Updated for plan year 2026
In short
The core difference: an HSA is yours to keep and rolls over every year but requires a qualified high-deductible plan, while an FSA is owned by your employer and usually forfeited at year end but works with any plan. Both let you spend pre-tax dollars on medical costs. The HSA is the long-term, portable account with a plan requirement; the FSA is the flexible, use-it-this-year account tied to your job.
Side by side
| Dimension | HSA | FSA |
|---|---|---|
| Plan requirement | Requires a qualified HDHP | Works with most plans |
| Who owns it | You, and it's portable | Your employer's benefit plan |
| Unused funds | Roll over and stay invested | Generally forfeited at year end |
| If you change jobs | Goes with you | Usually stays behind |
| Contribution limits | Set yearly by the IRS | Set yearly by the IRS |
When HSA wins
An HSA wins when you're on or willing to take a qualified high-deductible plan and want an account that builds over time. Because the balance is yours and never expires, you can let it grow into a long-term cushion for future medical costs, even into retirement. It's the better tool if you can fund it and don't need to spend every dollar each year.
When FSA wins
An FSA wins when you don't have a high-deductible plan but still want to pay predictable health costs, like copays, prescriptions, dental, and glasses, with pre-tax money. It's also the only option of the two if your plan isn't HSA-qualified. The catch is timing: you generally have to spend it within the year, so it suits costs you can reasonably plan.
The bottom line
If you have a qualified high-deductible plan, the HSA's portability and rollover make it the stronger account. If you don't, the FSA still cuts your tax bill on expected costs; just plan your spending so you don't forfeit what's left.