HSA & FSA Calculator
Calculate your annual tax savings from an HSA or FSA contribution. See your effective cost per dollar, contribution limit, and projected HSA balance at age 65.
Age 55+ eligible for $1,000 HSA catch-up contribution
Used to project balance at age 65
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Frequently asked questions
What is the difference between an HSA and an FSA?
An HSA (Health Savings Account) requires a High Deductible Health Plan (HDHP) and rolls over year to year — it is yours forever. An FSA (Flexible Spending Account) works with any health plan but has a use-it-or-lose-it rule (up to $640 rollover allowed in 2025). HSAs also allow investing the balance for long-term tax-free growth, making them triple-tax-advantaged.
Can I have both an HSA and an FSA?
Not a general Healthcare FSA — it would disqualify your HSA. You can pair an HSA with a Limited Purpose FSA (covers only dental/vision) or a Dependent Care FSA (different benefit category). Check with your employer for what is offered.
What happens to unused FSA money?
The IRS allows a rollover of up to $640 (2025) from a Healthcare FSA to the next plan year, or a 2.5-month grace period to spend it. Unused funds beyond those limits are forfeited — plan your contribution carefully.
Is an HSA worth it if I am healthy and rarely use medical care?
Yes — an HSA is especially valuable for healthy people. You contribute pre-tax, invest the balance in index funds, and the money grows tax-free for decades. At 65, you can withdraw for any reason (paying income tax, like a 401k). You can also reimburse yourself years later for old medical expenses if you kept the receipts.