First, it is quite common for a defined benefit plan to prohibit employee contributions. In the private sector, it is actually fairly unusual to find a defined benefit plan that permits them. Second, a pick-up technically refers to a situation in which an employer pays a contribution referred to in the plan as an employee contribution. So if there is no provision in a plan for employee contributions, technically there is no pick-up. If the plan provides for employer contributions beyond those mandated, the employer could make such contributions (and might be able to reduce employees' salary to reflect this). However, most defined benefit plans that preclude employee contributions also make no provision for employer contributions beyond the mandated amount. As the name suggests, a defined benefit plan typically provides a benefit that is defined in the plan, and mandates employer (and in some instances, employee) contributions to fund that benefit. If that basic structure is followed, additional employer contributions would not create any corresponding increase in the benefits provided to employees, and thus no employer would make them. If a defined benefit is to accept additional employer or employee contributions to increase employee benefits under the plan, it needs to provide explicitly for such contributions, and specify how they will increase the benefits of employees (e.g., are they allocated to a separate account for each employee, or do they provide for a percentage increase in the defined benefit for each employee?), in order to avoid issues with the definitely determinable benefits rule.