A pension plan under which an employer credits a participant’s account with a set percentage of his or her yearly compensation plus interest charges. A cash balance pension plan is a defined-benefit plan. As such, the plan’s funding limits, funding requirements and investment risk are based on defined-benefit requirements: as changes in the portfolio do not affect the final benefits to be received by the participant upon retirement or termination, the company solely bears all ownership of profits and losses in the portfolio.
Explained further: Although the cash balance pension plan is a defined-benefit plan, unlike the regular defined-benefit plan, the cash balance plan is maintained on an individual account basis, much like a defined-contribution plan. The cash balance plan acts similar to a defined-contribution plan also because changes in the value of the participant’s portfolio does not affect the yearly contribution.
Definition courtesy of Investopedia