On average, employers add more than 35% of the total contributions to employees' workplace retirement accounts, said Doug Fisher, senior vice president of Workplace Investing at Fidelity.
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"Most people are going to have to rely on their retirement savings for about half of their retirement income, so it's critical they participate early in 401(k)s and participate to the level to get the valuable company match."
Read MoreThe good and bad sides to ignoring your 401(k)
According to the survey of 1,026 people, 25 and older, who were employed and contributing to a workplace retirement plan, 42% of them are not saving in any way for retirement other than their 401(k).