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Defined benefit pension plan is a type of pension plan in which an employer/sponsor promises a specified pension payment, lump-sum, or combination thereof on retirement that depends on an employee's earnings history, tenure of service and age, rather than depending directly on individual investment returns. Traditionally, many governmental and public entities, as well as a large number of corporations, provide defined benefit plans, sometimes as a means of compensating workers in lieu of increased pay.
A defined benefit plan is 'defined' in the sense that the benefit formula is defined and known in advance. Conversely, for a "defined contribution retirement saving plan," the formula for computing the employer's and employee's contributions is defined and known in advance, but the benefit to be paid out is not known in advance.
In the United States, 26 U.S.C. § 414 specifies a defined benefit plan to be any pension plan that is not a defined contribution plan, where a defined contribution plan is any plan with individual accounts. A traditional pension plan that defines a benefit for an employee upon that employee's retirement is a defined benefit plan.
The most common type of formula used is based on the employee's terminal earnings. Under this formula, benefits are based on a percentage of average earnings during a specified number of years at the end of a worker's career.