What Does A Retirement Plan Administrator Do? 
The Retirement Plan Administrator typically is responsible for administering all aspects of the plan for the plan sponsor -LRB- normally a company sponsoring the plan -RRB- . Some of the duties include providing summary of the plan to participants , selecting investments for the plan , enrolling plan entrants in a timely manner . Most plan administrators will contract with a third party to help with all the responsibilities , including filing Form 5500 -LRB- like a tax return for retirement plans -RRB- and often the testing required by the government to make sure the plan is not discriminating higher income employees over the lower income employees . 