Key Points HSAs let you set aside money for healthcare expenses in a tax-advantaged fashion. Investing your HSA for many years could grow your balance into a larger sum in time for retirement. Data shows that only about 10% of HSA holders have that money invested, which means most savers are missing a huge opportunity. The $23,760 Social Security bonus most retirees completely overlook › There are certain expenses in your life you can control to a reasonable degree. Housing, for example, is somet ...