Both HSAs and flexible spending accounts (FSAs) allow you to spend pre-tax dollars on eligible medical expenses. However, the requirements and limitations are different.  You do not need an HDHP to qualify for an FSA. An entire year\\'s worth of funds are available at the beginning of the year.  On the FSA downside, funds do not roll over each year. Any money you don’t use by the end of the year is forfeited. FSA funds cannot be invested either, so there is no tax-free growth. FSAs are self-only accounts with smaller contribution limits.