HSA - is a type of savings account that lets you set aside money on a pre-tax basis to pay for qualified medical expenses. By using untaxed dollars in an HSA to pay for deductibles, copayments, coinsurance, and some other expenses, you may be able to lower your out-of-pocket health care costs. HSA funds generally may not be used to pay premiums.

FSA - is a special account you put money into that you use to pay for certain out-of-pocket health care costs. You don’t pay taxes on this money. This means you’ll save an amount equal to the taxes you would have paid on the money you set aside.