Social Security is a reliable source of income for most retirees, but it doesn’t tend to provide as much money as the income you earned in your working years. What if you could make that monthly check work harder? Find Out: Here’s Why You Might Want to Invest Your Retirement Savings in a Roth 401(k) Read Next: 6 Popular SUVs That Aren't Worth the Cost -- and 6 Affordable Alternatives If you have other retirement income to cover living expenses, investing your Social Security payments could grow that money ...