Yet another study has found that lower-income workers don't get as much bang for the buckfrom 401(k) accounts, while higher-income workers can take advantage of more plan provisionsand make out better financially.

The 2017 MassMutual Retirement Savings & Household Income Study reveals that despite ahigh participation rate among middle-income workers, the lower their income, the less likelythey are to reap the full advantages from their employer's retirement savings plan.

"Nearly nine in 10 middle-income Americans participate in employer-sponsored retirementplans," Tom Foster, national spokesperson for MassMutual's Workplace Solutions, says in thereport, adding that the company's research "shows that savers with higher incomes are far morelikely to contribute a higher percentage of their income and take full advantage of matchingcontributions."