An HSA is a personal savings account that you use to save and pay for healthcare. You can open an HSA if you’re enrolled in an “HSA-qualified” health plan. With an HSA, you have a tax-advantaged way to help you save for future medical expenses, plus greater flexibility in using your healthcare dollars. A few important HSA features: You own the account, so the money is yours to keep forever, even if you change jobs or retire; there is no “use it or lose it” rule, so unused money in your HSA rolls over to the next year; your HSA deposits and withdrawals (to pay for eligible expenses) are tax-free.