FSA vs HSA Calculator
Compare the immediate tax benefit of each account—and see how the risk of unused FSA money changes the result.
Run your comparison
Use your own yearly estimates. The calculation stays hidden until every field is valid.
Your comparison
Estimated federal income-tax benefit based on the numbers you entered.
Not included: potential HSA investment growth. This comparison looks only at contributions and simplified federal tax savings.
What these numbers mean
The tax-savings figures estimate how much federal income tax each planned contribution could avoid at your marginal rate. The FSA's net benefit then subtracts the amount you said could go unspent and be forfeited. The HSA's net benefit does not subtract forfeiture because HSA money remains in the account and rolls over from year to year.
Your medical-expense estimate gives context, but it does not change the tax-savings formula. Compare your planned contribution with costs you can reasonably expect, especially for the FSA, where overfunding can put money at risk.