While an HSA resembles a flexible spending account (FSA), which your employer may offer as part of your benefits package, there are also some significant differences. For example, the money in your HSA can be rolled over yearly, which isn't the case with an FSA. If you change jobs, you can take an HSA, but not an FSA, with you. And if you don't have access to an HSA through your employment, you can open one with a bank or other financial services company and deduct your contribution when you file your tax return for the year you contributed. That's not possible with an FSA.