HSA vs. FSA, Explained
Reviewed for accuracy by the Clearcoin team
Health savings accounts (HSAs) and flexible spending accounts (FSAs) both let you pay for medical costs with pre-tax money. They sound similar, but the rules — especially about keeping your money — are very different.
Key takeaways
- Both let you set aside pre-tax dollars for qualified medical expenses like copays, prescriptions, and dental care.
- An FSA is generally 'use it or lose it' — money left at the end of the plan year is usually forfeited, though some plans allow a small carryover or grace period.
- An HSA is only available if you have a qualifying high-deductible health plan (HDHP).
- Because HSA money rolls over and can be invested, many people use it as a long-term account: contributions are pre-tax, growth is tax-free, and withdrawals for medical costs are tax-free.
On this page
What they have in common
Both let you set aside pre-tax dollars for qualified medical expenses like copays, prescriptions, and dental care. That lowers your taxable income, so you effectively get a discount on health costs you were going to have anyway.
The big difference: 'use it or lose it'
An FSA is generally 'use it or lose it' — money left at the end of the plan year is usually forfeited, though some plans allow a small carryover or grace period. An HSA is yours forever: unused money rolls over every year and stays with you even if you change jobs.
Who can use each
An HSA is only available if you have a qualifying high-deductible health plan (HDHP). An FSA is typically offered through an employer regardless of your plan type. If you have an HDHP, the HSA is often the more powerful account.
Why an HSA is also a stealth retirement account
Because HSA money rolls over and can be invested, many people use it as a long-term account: contributions are pre-tax, growth is tax-free, and withdrawals for medical costs are tax-free. That triple tax advantage is rare — but only pay from it for medical expenses to keep it tax-free.
Official resources
Primary sources so you can check the current rules and numbers yourself:
Frequently asked questions
Can I have both an HSA and an FSA?
Usually not at the same time, with a narrow exception for a 'limited-purpose' FSA covering dental and vision. Check your plan's rules.
What happens to my FSA money if I don't use it?
It is typically forfeited at year-end, though some plans allow a limited carryover or grace period. Plan your contributions to match expenses you know are coming.
Do I lose my HSA if I change jobs?
No. An HSA belongs to you, not your employer, and the balance goes with you.