The Best Way to Double Your Money

​While it's not nearly as fun as watching your favorite stock on the evening news, the undisputed heavyweight champ of doubling your money is that matching contribution you receive in your employer's retirement plan. It's not sexy and it won't wow the neighbors at your next block party, but getting an automatic 50 cents for every dollar you deposit is tough to beat.

Making it even better is the fact that the money going into your 401(k) or other employer-sponsored retirement plan comes right off the top of what your employer reports to the IRS. For most Americans, that means that each dollar invested really only costs them 65 to 75 cents out of their pockets. In other words, for every 75 cents, most Americans are willing to forgo out of their paychecks, they'll have $1.50 or more added to their retirement nest egg. Before you start complaining about how your employer doesn't have a 401(k) or how your company has cut their contribution because of the economy, don't forget that the government also "matches" some portion of the retirement contributions of taxpayers earning less than a certain amount. The Credit for Qualified Retirement Savings Contribution reduces your tax bill by 10 to 50% of what ever you contribute to a variety of retirement accounts (from 401(k)s to Roth IRAs).