Answer:
The fundamental difference between a flexible spending account (FSA) and a health savings account (HSA) is that an HSA is controlled by an individual and allows commitments to roll over, whereas FSAs are less adaptable and must be claimed by a company.
Explanation:
This means that if you leave your work, the funds in your FSA may be forfeited, whereas the assets in your HSA are entirely yours (and rollover into another HSA account). FSAs and HSAs both allow people to save money away for medical expenses on a tax-advantaged basis by paying for eligible medical expenses with pretax money.