To save the most for retirement, you need all the help you can get. But when it comes to their 401(k)s, many Americans don't take maximum advantage of one simple strategy.

In the following video from The Motley Fool's series on retirement investing, sponsored by TD Ameritrade, Fool consumer finance expert Dayana Yochim talks to Dan Caplinger, the Fool's director of investment planning, about why you should take full advantage of employer matching of 401(k) contributions. Dan notes that an employer match is essentially free money that gets added to your 401(k) balance on top of your own contributions. Dan points out that you generally have to work a minimum length of time in order to become fully entitled to the match, but it can be a big windfall for those who stay in their jobs for more than a few years. Dan recommends that most employees should contribute at least enough to take full advantage of the match, which often requires contributing somewhere between 3% and 6% of your salary.

The other income source you should consider
Your 401(k) gives you a lot of flexibility in retirement, but you also have to make the most of the Social Security benefits you're entitled to as well. In our brand-new free report, "Make Social Security Work Harder For You," our retirement experts give their insight on making the key decisions that will help ensure a more comfortable retirement for you and your family. Click here to get your copy today.

Dan Caplinger and Dayana Yochim have no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.