This retirement plan meets the qualification requirements of Internal Revenue Code Section 401(a). In this type of plan, employers determine the amount of money that they may contribute on your behalf each year, the requirements that you must meet to receive those contributions, and under what circumstances the money may be made available to you. Some 401(a) plans may allow for employee after-tax contributions or, in the case of a 401(k) plan, employee pre-tax contributions. Types of 401(a) plans include profit sharing plans, pension plans, and money purchase plans.