Two acronyms, both offering tax-free money for medical costs, both presented in the same enrolment screen. They behave very differently, and choosing without knowing which is which costs people money every year.
Health Savings Account
Available only if you are enrolled in a qualifying high-deductible health plan. Contributions reduce your taxable income, growth is tax free, and withdrawals for qualified medical expenses are tax free.
The features that matter:
- It rolls over indefinitely. Unused money is never forfeited.
- It is yours. Change jobs and it goes with you.
- It can be invested, often once you pass a minimum cash balance, so it can function as a long-term account.
- Employers sometimes contribute directly to it.
Flexible Spending Account
Available with most employer plans, not tied to a high-deductible plan. Contributions are pre-tax and withdrawals for eligible expenses are tax free.
The catches:
- Use it or lose it. Unused funds are generally forfeited at year end. Employers may offer a small carryover or a short grace period, but neither is guaranteed.
- It belongs to the plan, not you. Leaving your job usually forfeits the remainder.
- The full annual election is typically available from day one, which is genuinely useful for a known upcoming expense.
The rule of thumb: if you qualify for an HSA and can cover the higher deductible from savings, the HSA is usually the stronger long-term account. An FSA is best when you have predictable medical costs this year and want them pre-tax.
Check the current limits
Contribution limits for both change annually and are set by the IRS. Look them up on the IRS site at enrolment rather than relying on last year's figure.
The short version
- HSA rolls over, is portable, and can be invested. Requires a high-deductible plan.
- FSA usually expires at year end and does not follow you between jobs.
- FSA gives you the full annual election immediately, which suits known expenses.
- Look up the current year's limits before you elect.
Common questions
Can I have both an HSA and an FSA?
Generally not a standard FSA alongside an HSA. A limited-purpose FSA, restricted to dental and vision, is sometimes permitted alongside one.
What happens to my FSA if I quit?
You usually forfeit the remaining balance, though you keep reimbursements for expenses incurred while employed. An HSA is unaffected because it is yours.
Is an HSA a retirement account?
Not officially, but it behaves like one. It rolls over, can be invested, and after a certain age non-medical withdrawals are taxed as ordinary income rather than penalised.