KEY POINTS
  • The smallest 401(k) plans charge fees of 0.88% a year, while the largest charge 0.41%, according to Morningstar research.
  • Those fees are levied annually as a percentage of a worker's total savings. The extra costs can amount to a lot of money.

Workers who save in a 401(k) plan offered by a small business pay fees that are twice as high as those paid by employees who work at the largest companies in the U.S.

The smallest workplace retirement plans (those with less than $25 million in aggregate savings) charge total fees of 0.88% a year, while the largest (those with more than $500 million) charge 0.41% annually, according to a Morningstar Center for Retirement and Policy Studies report.