401(K) Plans: Effects of Eligibility and Vesting Policies on Workers’ Retirement Savings, GAO-17-69: Published: Oct 21, 2016. Publicly Released: Nov 21, 2016.

“GAO’s nongeneralizable survey of 80 401(k) plans ranging in size from fewer than 100 participants to more than 5,000 and its review of industry data found that many plans have policies that affect workers’ ability to (1) save in plans (eligibility policies), (2) receive employer contributions, and (3) keep those employer contributions if they leave their job (vesting policies). Thirty-three of 80 plans surveyed had policies that did not allow workers younger than age 21 to participate in the plan. In addition, 19 plans required participants to be employed on the last day of the year to receive any employer contribution for that year. Fifty-seven plans had vesting policies requiring employees to work for a certain period of time before employer contributions to their accounts are vested. Plan sponsors and plan professionals GAO surveyed identified lowering costs and reducing employee turnover as the primary reasons that plans use these policies.”